How Fast?
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Posts: 46,084
I want to measure the speed of a ball traveling between 200 and 350 feet per
second. i would like to have an accuracy of 5 ft per second. i plan on
using some sort of 'light gates' and measure the interval of time it takes
the ball to break both gates... however, the distance between the gates can
be a maximum of about 8 inches... this means the stamp would have to measure
an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
have to be .000038 sec to achieve 5 ft/sec.
so the question is... can any of the stamps measure this time interval...
if not, does anyone know of something which is small and affordable that
will?
Thanks
second. i would like to have an accuracy of 5 ft per second. i plan on
using some sort of 'light gates' and measure the interval of time it takes
the ball to break both gates... however, the distance between the gates can
be a maximum of about 8 inches... this means the stamp would have to measure
an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
have to be .000038 sec to achieve 5 ft/sec.
so the question is... can any of the stamps measure this time interval...
if not, does anyone know of something which is small and affordable that
will?
Thanks
Comments
guns at 200 FPS to M-16 at 2,800 FPS. you should find someting
reasonably priced.
Here's a site:
http://www.weinlich.de/vm01gb.htm
--- In basicstamps@y..., "Jason W. Day" <dayjw@e...> wrote:
> I want to measure the speed of a ball traveling between 200 and 350
feet per
> second. i would like to have an accuracy of 5 ft per second. i
plan on
> using some sort of 'light gates' and measure the interval of time
it takes
> the ball to break both gates... however, the distance between the
gates can
> be a maximum of about 8 inches... this means the stamp would have
to measure
> an interval of time of 0.001905 sec at 350 ft/sec. and the
accurracy would
> have to be .000038 sec to achieve 5 ft/sec.
>
> so the question is... can any of the stamps measure this time
interval...
> if not, does anyone know of something which is small and affordable
that
> will?
>
> Thanks
accessories. I have some experience with a pact model 1. It is very accurate
but I have had problems with big bullets at below 600 fps.
http://www.pact.com/mod1.html
Try http://www.brownells.com
search for "chronographs". One of them is called the shooting chrony and it
advertises 70 to 5000 fps at a cost of $99.00
Hope this helps
Jeff.
Original Message
From: <davemucha@j...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 01, 2001 8:06 PM
Subject: [noparse][[/noparse]basicstamps] Re: How Fast?
> Search for bullet velocity meters. They use light, measure pellet
> guns at 200 FPS to M-16 at 2,800 FPS. you should find someting
> reasonably priced.
> Here's a site:
> http://www.weinlich.de/vm01gb.htm
>
>
>
>
> --- In basicstamps@y..., "Jason W. Day" <dayjw@e...> wrote:
> > I want to measure the speed of a ball traveling between 200 and 350
> feet per
> > second. i would like to have an accuracy of 5 ft per second. i
> plan on
> > using some sort of 'light gates' and measure the interval of time
> it takes
> > the ball to break both gates... however, the distance between the
> gates can
> > be a maximum of about 8 inches... this means the stamp would have
> to measure
> > an interval of time of 0.001905 sec at 350 ft/sec. and the
> accurracy would
> > have to be .000038 sec to achieve 5 ft/sec.
> >
> > so the question is... can any of the stamps measure this time
> interval...
> > if not, does anyone know of something which is small and affordable
> that
> > will?
> >
> > Thanks
>
>
>
>
internal counter and the counter runs at 5mhz. The object passes the
first gate starts counter and second gate stops timer reads counter
register. It then stores time, date, and digital value to eeprom for
later download to a PC, which does all the math ( used Q basic ) and
gives me time date and speed. Using a stamp you may be able to use
external counters and oscillators but then you may not even need the
stamp ?
davemucha@j... wrote:
>
> Search for bullet velocity meters. They use light, measure pellet
> guns at 200 FPS to M-16 at 2,800 FPS. you should find someting
> reasonably priced.
> Here's a site:
> http://www.weinlich.de/vm01gb.htm
>
> --- In basicstamps@y..., "Jason W. Day" <dayjw@e...> wrote:
> > I want to measure the speed of a ball traveling between 200 and 350
> feet per
> > second. i would like to have an accuracy of 5 ft per second. i
> plan on
> > using some sort of 'light gates' and measure the interval of time
> it takes
> > the ball to break both gates... however, the distance between the
> gates can
> > be a maximum of about 8 inches... this means the stamp would have
> to measure
> > an interval of time of 0.001905 sec at 350 ft/sec. and the
> accurracy would
> > have to be .000038 sec to achieve 5 ft/sec.
> >
> > so the question is... can any of the stamps measure this time
> interval...
> > if not, does anyone know of something which is small and affordable
> that
> > will?
> >
> > Thanks
10uS resolution.
Regards,
Al Williams
AWC
http://www.al-williams.com/awce/pak7.htm
>
Original Message
> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=bHq0XzKgK1v1AFB07yzfxOO6pTTfpwDj4rbwRe3ppn1_tTAEcoRJj4zJT9YTn2_5iVBiFs_pxvIJhLyDQTAE]lgaminde@t...[/url
> Sent: Friday, February 02, 2001 10:21 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Re: How Fast?
>
>
> I have a project which does this. I used a 20 mhz pic which has a
> internal counter and the counter runs at 5mhz. The object passes the
> first gate starts counter and second gate stops timer reads counter
> register. It then stores time, date, and digital value to eeprom for
> later download to a PC, which does all the math ( used Q basic ) and
> gives me time date and speed. Using a stamp you may be able to use
> external counters and oscillators but then you may not even need the
> stamp ?
>
> davemucha@j... wrote:
> >
> > Search for bullet velocity meters. They use light, measure pellet
> > guns at 200 FPS to M-16 at 2,800 FPS. you should find someting
> > reasonably priced.
> > Here's a site:
> > http://www.weinlich.de/vm01gb.htm
> >
> > --- In basicstamps@y..., "Jason W. Day" <dayjw@e...> wrote:
> > > I want to measure the speed of a ball traveling between 200 and 350
> > feet per
> > > second. i would like to have an accuracy of 5 ft per second. i
> > plan on
> > > using some sort of 'light gates' and measure the interval of time
> > it takes
> > > the ball to break both gates... however, the distance between the
> > gates can
> > > be a maximum of about 8 inches... this means the stamp would have
> > to measure
> > > an interval of time of 0.001905 sec at 350 ft/sec. and the
> > accurracy would
> > > have to be .000038 sec to achieve 5 ft/sec.
> > >
> > > so the question is... can any of the stamps measure this time
> > interval...
> > > if not, does anyone know of something which is small and affordable
> > that
> > > will?
> > >
> > > Thanks
>
>
>I want to measure the speed of a ball traveling between 200 and 350 feet per
>second. i would like to have an accuracy of 5 ft per second. i plan on
>using some sort of 'light gates' and measure the interval of time it takes
>the ball to break both gates... however, the distance between the gates can
>be a maximum of about 8 inches... this means the stamp would have to measure
>an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
>have to be .000038 sec to achieve 5 ft/sec.
>
>so the question is... can any of the stamps measure this time interval...
>if not, does anyone know of something which is small and affordable that
>will?
>
>Thanks
The PULSIN command on the BS2 and BS2e can resolve time to 2
microseconds in an interval of up to 0.13 second, and the BS2sx and
BS2P can resolve to 0.8 microseconds. That is well within your
specifications.
-- Tracy
would you measure the size of the object and use one gate or use one
gate to go high and the second to turn off and use pulsin to measure
the time per a set distance?
Tracy Allen wrote:
>
> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> >I want to measure the speed of a ball traveling between 200 and 350 feet per
> >second. i would like to have an accuracy of 5 ft per second. i plan on
> >using some sort of 'light gates' and measure the interval of time it takes
> >the ball to break both gates... however, the distance between the gates can
> >be a maximum of about 8 inches... this means the stamp would have to measure
> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
> >have to be .000038 sec to achieve 5 ft/sec.
> >
> >so the question is... can any of the stamps measure this time interval...
> >if not, does anyone know of something which is small and affordable that
> >will?
> >
> >Thanks
>
> The PULSIN command on the BS2 and BS2e can resolve time to 2
> microseconds in an interval of up to 0.13 second, and the BS2sx and
> BS2P can resolve to 0.8 microseconds. That is well within your
> specifications.
>
> -- Tracy
The gate itself would have to be designed around the ball and what it
is rolling on, etc etc,--more information is needed!
If the ball itself is 8 inches in diameter and rolling on a smooth
track, then the ball itself might break the light beam and the pulsin
command could work on that time of eclipse directly. Alternatively,
the Stamp might need an external flip flop, set by one sensor and
reset by a second sensor farther downstream,
The problem with pulsin command is that it will not wait forever for
the leading edge of the ball. It will time out after 0.13 seconds.
So the following BS2 program has a chance of missing the leading edge
of the pulse (about 0.4% of asynchronous events):
loop:
pulsin 0,1,x
branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
' ...deal with measurement here
The best bet would be to have some way to anticipate the arrival of
the ball, anticipate by somewhere between 1 and 130 milliseconds.
That might be hooked to the system that releases the ball, or it
might be an additional photo gate upstream. Those additional parts
might make it worthwhile to spring for something like the PIC project
you described in your earlier message, or the PAK-VII, or Steve
Parkis' TM-1.
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
>How would this work Tracy
>
>would you measure the size of the object and use one gate or use one
>gate to go high and the second to turn off and use pulsin to measure
>the time per a set distance?
>
>Tracy Allen wrote:
>>
>> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
>> >I want to measure the speed of a ball traveling between 200 and
>>350 feet per
>> >second. i would like to have an accuracy of 5 ft per second. i plan on
>> >using some sort of 'light gates' and measure the interval of time it takes
>> >the ball to break both gates... however, the distance between the gates can
>> >be a maximum of about 8 inches... this means the stamp would have
>>to measure
>> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
>> >have to be .000038 sec to achieve 5 ft/sec.
>> >
>> >so the question is... can any of the stamps measure this time interval...
>> >if not, does anyone know of something which is small and affordable that
>> >will?
>> >
>> >Thanks
>>
>> The PULSIN command on the BS2 and BS2e can resolve time to 2
>> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > BS2P can resolve to 0.8 microseconds. That is well within your
> > specifications.
> >
> > -- Tracy
Original Message
From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VH--GW4LyTk7W1IBx8uHZRhz-uKk_h22L6ZFfMHhHKpoqhr2G018x8KanGV3Gm7xNqJVBiq-7UpCtg]tracy@e...[/url
Sent: Friday, February 02, 2001 6:18 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
Hi Larry,
The gate itself would have to be designed around the ball and what it
is rolling on, etc etc,--more information is needed!
If the ball itself is 8 inches in diameter and rolling on a smooth
track, then the ball itself might break the light beam and the pulsin
command could work on that time of eclipse directly. Alternatively,
the Stamp might need an external flip flop, set by one sensor and
reset by a second sensor farther downstream,
The problem with pulsin command is that it will not wait forever for
the leading edge of the ball. It will time out after 0.13 seconds.
So the following BS2 program has a chance of missing the leading edge
of the pulse (about 0.4% of asynchronous events):
loop:
pulsin 0,1,x
branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
' ...deal with measurement here
The best bet would be to have some way to anticipate the arrival of
the ball, anticipate by somewhere between 1 and 130 milliseconds.
That might be hooked to the system that releases the ball, or it
might be an additional photo gate upstream. Those additional parts
might make it worthwhile to spring for something like the PIC project
you described in your earlier message, or the PAK-VII, or Steve
Parkis' TM-1.
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
>How would this work Tracy
>
>would you measure the size of the object and use one gate or use one
>gate to go high and the second to turn off and use pulsin to measure
>the time per a set distance?
>
>Tracy Allen wrote:
>>
>> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
>> >I want to measure the speed of a ball traveling between 200 and
>>350 feet per
>> >second. i would like to have an accuracy of 5 ft per second. i plan on
>> >using some sort of 'light gates' and measure the interval of time it
takes
>> >the ball to break both gates... however, the distance between the gates
can
>> >be a maximum of about 8 inches... this means the stamp would have
>>to measure
>> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
would
>> >have to be .000038 sec to achieve 5 ft/sec.
>> >
>> >so the question is... can any of the stamps measure this time
interval...
>> >if not, does anyone know of something which is small and affordable that
>> >will?
>> >
>> >Thanks
>>
>> The PULSIN command on the BS2 and BS2e can resolve time to 2
>> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > BS2P can resolve to 0.8 microseconds. That is well within your
> > specifications.
> >
> > -- Tracy
Original Message
From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=k4B0yfbAyDBAQnOnC1EH9tnkEPBfRti8FOPr87zsTdbZDV1GDobuTEgdMcy0b7xB1uQUp80iKWYJM2Ic]tracy@e...[/url
Sent: Friday, February 02, 2001 6:18 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
Hi Larry,
The gate itself would have to be designed around the ball and what it
is rolling on, etc etc,--more information is needed!
If the ball itself is 8 inches in diameter and rolling on a smooth
track, then the ball itself might break the light beam and the pulsin
command could work on that time of eclipse directly. Alternatively,
the Stamp might need an external flip flop, set by one sensor and
reset by a second sensor farther downstream,
The problem with pulsin command is that it will not wait forever for
the leading edge of the ball. It will time out after 0.13 seconds.
So the following BS2 program has a chance of missing the leading edge
of the pulse (about 0.4% of asynchronous events):
loop:
pulsin 0,1,x
branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
' ...deal with measurement here
The best bet would be to have some way to anticipate the arrival of
the ball, anticipate by somewhere between 1 and 130 milliseconds.
That might be hooked to the system that releases the ball, or it
might be an additional photo gate upstream. Those additional parts
might make it worthwhile to spring for something like the PIC project
you described in your earlier message, or the PAK-VII, or Steve
Parkis' TM-1.
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
>How would this work Tracy
>
>would you measure the size of the object and use one gate or use one
>gate to go high and the second to turn off and use pulsin to measure
>the time per a set distance?
>
>Tracy Allen wrote:
>>
>> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
>> >I want to measure the speed of a ball traveling between 200 and
>>350 feet per
>> >second. i would like to have an accuracy of 5 ft per second. i plan on
>> >using some sort of 'light gates' and measure the interval of time it
takes
>> >the ball to break both gates... however, the distance between the gates
can
>> >be a maximum of about 8 inches... this means the stamp would have
>>to measure
>> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
would
>> >have to be .000038 sec to achieve 5 ft/sec.
>> >
>> >so the question is... can any of the stamps measure this time
interval...
>> >if not, does anyone know of something which is small and affordable that
>> >will?
>> >
>> >Thanks
>>
>> The PULSIN command on the BS2 and BS2e can resolve time to 2
>> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > BS2P can resolve to 0.8 microseconds. That is well within your
> > specifications.
> >
> > -- Tracy
leaving the tube will all balls be the same size ( can't believe I
said that ) and what are they made of.
"Jason W. Day" wrote:
>
> the ball is 0.68 in in diameter and is traveling through a straight tube.
>
>
Original Message
> From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=zbg8aq7dx3bHtOVTvAjcsP0G5m3e9Oqn9MfSk2Q_-JIxaMiMi5YhibFZzAs06Nxj8YQpW_LEH4X3vA]tracy@e...[/url
> Sent: Friday, February 02, 2001 6:18 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> Hi Larry,
>
> The gate itself would have to be designed around the ball and what it
> is rolling on, etc etc,--more information is needed!
>
> If the ball itself is 8 inches in diameter and rolling on a smooth
> track, then the ball itself might break the light beam and the pulsin
> command could work on that time of eclipse directly. Alternatively,
> the Stamp might need an external flip flop, set by one sensor and
> reset by a second sensor farther downstream,
>
> The problem with pulsin command is that it will not wait forever for
> the leading edge of the ball. It will time out after 0.13 seconds.
> So the following BS2 program has a chance of missing the leading edge
> of the pulse (about 0.4% of asynchronous events):
>
> loop:
> pulsin 0,1,x
> branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> ' ...deal with measurement here
>
> The best bet would be to have some way to anticipate the arrival of
> the ball, anticipate by somewhere between 1 and 130 milliseconds.
> That might be hooked to the system that releases the ball, or it
> might be an additional photo gate upstream. Those additional parts
> might make it worthwhile to spring for something like the PIC project
> you described in your earlier message, or the PAK-VII, or Steve
> Parkis' TM-1.
>
> -- Tracy Allen
> electronically monitored ecosystems
> http://www.emesystems.com
>
> >How would this work Tracy
> >
> >would you measure the size of the object and use one gate or use one
> >gate to go high and the second to turn off and use pulsin to measure
> >the time per a set distance?
> >
> >Tracy Allen wrote:
> >>
> >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> >> >I want to measure the speed of a ball traveling between 200 and
> >>350 feet per
> >> >second. i would like to have an accuracy of 5 ft per second. i plan on
> >> >using some sort of 'light gates' and measure the interval of time it
> takes
> >> >the ball to break both gates... however, the distance between the gates
> can
> >> >be a maximum of about 8 inches... this means the stamp would have
> >>to measure
> >> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
> would
> >> >have to be .000038 sec to achieve 5 ft/sec.
> >> >
> >> >so the question is... can any of the stamps measure this time
> interval...
> >> >if not, does anyone know of something which is small and affordable that
> >> >will?
> >> >
> >> >Thanks
> >>
> >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > > BS2P can resolve to 0.8 microseconds. That is well within your
> > > specifications.
> > >
> > > -- Tracy
would be options, but leaving the tube, the sensor would have to be mounted
to the end of the tube and not stick out.. the ball is made of mostly
vegetable oil and water= (gelatin).
Original Message
From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=wRWeiE5fGx_SdK2gFOfhZbQ0nubC-dbf1fsOUL7OtugUrcVVKs0RIjG1x0nsLxH8kLy0YvP3t_beXdEsTQ]lgaminde@t...[/url
Sent: Friday, February 02, 2001 6:57 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
can the tube be drilled do you want to measure it in the tube or
leaving the tube will all balls be the same size ( can't believe I
said that ) and what are they made of.
"Jason W. Day" wrote:
>
> the ball is 0.68 in in diameter and is traveling through a straight tube.
>
>
Original Message
> From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=NZJTuHLlhfxHMFuQ8MdmSSH5HN3TmRkqQNFymWeZxtAGn2TDRxs-dGl0h4xHDjsWlkEfSQA44DWtAJ5G6fes]tracy@e...[/url
> Sent: Friday, February 02, 2001 6:18 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> Hi Larry,
>
> The gate itself would have to be designed around the ball and what it
> is rolling on, etc etc,--more information is needed!
>
> If the ball itself is 8 inches in diameter and rolling on a smooth
> track, then the ball itself might break the light beam and the pulsin
> command could work on that time of eclipse directly. Alternatively,
> the Stamp might need an external flip flop, set by one sensor and
> reset by a second sensor farther downstream,
>
> The problem with pulsin command is that it will not wait forever for
> the leading edge of the ball. It will time out after 0.13 seconds.
> So the following BS2 program has a chance of missing the leading edge
> of the pulse (about 0.4% of asynchronous events):
>
> loop:
> pulsin 0,1,x
> branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> ' ...deal with measurement here
>
> The best bet would be to have some way to anticipate the arrival of
> the ball, anticipate by somewhere between 1 and 130 milliseconds.
> That might be hooked to the system that releases the ball, or it
> might be an additional photo gate upstream. Those additional parts
> might make it worthwhile to spring for something like the PIC project
> you described in your earlier message, or the PAK-VII, or Steve
> Parkis' TM-1.
>
> -- Tracy Allen
> electronically monitored ecosystems
> http://www.emesystems.com
>
> >How would this work Tracy
> >
> >would you measure the size of the object and use one gate or use one
> >gate to go high and the second to turn off and use pulsin to measure
> >the time per a set distance?
> >
> >Tracy Allen wrote:
> >>
> >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> >> >I want to measure the speed of a ball traveling between 200 and
> >>350 feet per
> >> >second. i would like to have an accuracy of 5 ft per second. i plan
on
> >> >using some sort of 'light gates' and measure the interval of time it
> takes
> >> >the ball to break both gates... however, the distance between the
gates
> can
> >> >be a maximum of about 8 inches... this means the stamp would have
> >>to measure
> >> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
> would
> >> >have to be .000038 sec to achieve 5 ft/sec.
> >> >
> >> >so the question is... can any of the stamps measure this time
> interval...
> >> >if not, does anyone know of something which is small and affordable
that
> >> >will?
> >> >
> >> >Thanks
> >>
> >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > > BS2P can resolve to 0.8 microseconds. That is well within your
> > > specifications.
> > >
> > > -- Tracy
led's and two or three of the radio shack IR modules about 10.00 in
parts the lights are pulsed at 40 khz using the 4060 chip. The IR
modules are set for 40khz this is so lighting will not set them off,
with holes on opposite sides one led and one sensor at each stage
three total or two total and use the Pulsin that tracy suggested
reading between two sensors or reading the time to pass one sensor and
use the other sensor for telling the stamp a ball is coming and get
pulsin ready.
"Jason W. Day" wrote:
>
> the tube can be drilled, is drilled... both inside and leaving the tube
> would be options, but leaving the tube, the sensor would have to be mounted
> to the end of the tube and not stick out.. the ball is made of mostly
> vegetable oil and water= (gelatin).
>
>
Original Message
> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nR8_f8JkvJM-TXJeQYsSlSi_D9-wl5TvJwzOVaKglsFrAlVadudY3UReYIAUCd5iuNR0qCboz7S5134]lgaminde@t...[/url
> Sent: Friday, February 02, 2001 6:57 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> can the tube be drilled do you want to measure it in the tube or
> leaving the tube will all balls be the same size ( can't believe I
> said that ) and what are they made of.
>
> "Jason W. Day" wrote:
> >
> > the ball is 0.68 in in diameter and is traveling through a straight tube.
> >
> >
Original Message
> > From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=QZpfMT9Xx7A1Wob6pjo4KRdKab5L4IxBQ1F9nUU56hBRKdAy6BSAsX58E04YNi8RNcpgHEFZZCWLLUw]tracy@e...[/url
> > Sent: Friday, February 02, 2001 6:18 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> >
> > Hi Larry,
> >
> > The gate itself would have to be designed around the ball and what it
> > is rolling on, etc etc,--more information is needed!
> >
> > If the ball itself is 8 inches in diameter and rolling on a smooth
> > track, then the ball itself might break the light beam and the pulsin
> > command could work on that time of eclipse directly. Alternatively,
> > the Stamp might need an external flip flop, set by one sensor and
> > reset by a second sensor farther downstream,
> >
> > The problem with pulsin command is that it will not wait forever for
> > the leading edge of the ball. It will time out after 0.13 seconds.
> > So the following BS2 program has a chance of missing the leading edge
> > of the pulse (about 0.4% of asynchronous events):
> >
> > loop:
> > pulsin 0,1,x
> > branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> > ' ...deal with measurement here
> >
> > The best bet would be to have some way to anticipate the arrival of
> > the ball, anticipate by somewhere between 1 and 130 milliseconds.
> > That might be hooked to the system that releases the ball, or it
> > might be an additional photo gate upstream. Those additional parts
> > might make it worthwhile to spring for something like the PIC project
> > you described in your earlier message, or the PAK-VII, or Steve
> > Parkis' TM-1.
> >
> > -- Tracy Allen
> > electronically monitored ecosystems
> > http://www.emesystems.com
> >
> > >How would this work Tracy
> > >
> > >would you measure the size of the object and use one gate or use one
> > >gate to go high and the second to turn off and use pulsin to measure
> > >the time per a set distance?
> > >
> > >Tracy Allen wrote:
> > >>
> > >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> > >> >I want to measure the speed of a ball traveling between 200 and
> > >>350 feet per
> > >> >second. i would like to have an accuracy of 5 ft per second. i plan
> on
> > >> >using some sort of 'light gates' and measure the interval of time it
> > takes
> > >> >the ball to break both gates... however, the distance between the
> gates
> > can
> > >> >be a maximum of about 8 inches... this means the stamp would have
> > >>to measure
> > >> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
> > would
> > >> >have to be .000038 sec to achieve 5 ft/sec.
> > >> >
> > >> >so the question is... can any of the stamps measure this time
> > interval...
> > >> >if not, does anyone know of something which is small and affordable
> that
> > >> >will?
> > >> >
> > >> >Thanks
> > >>
> > >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> > >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > > > BS2P can resolve to 0.8 microseconds. That is well within your
> > > > specifications.
> > > >
> > > > -- Tracy
it clear or color added
"Jason W. Day" wrote:
>
> the tube can be drilled, is drilled... both inside and leaving the tube
> would be options, but leaving the tube, the sensor would have to be mounted
> to the end of the tube and not stick out.. the ball is made of mostly
> vegetable oil and water= (gelatin).
>
>
Original Message
> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=5Y8e_BQfKv585s31WhPBYORgUFLSNcEpqzqgZXIyk-tn07kCfsOUX_2oxOQBnLAwt76aF6U5aIp6ahw]lgaminde@t...[/url
> Sent: Friday, February 02, 2001 6:57 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> can the tube be drilled do you want to measure it in the tube or
> leaving the tube will all balls be the same size ( can't believe I
> said that ) and what are they made of.
>
> "Jason W. Day" wrote:
> >
> > the ball is 0.68 in in diameter and is traveling through a straight tube.
> >
> >
Original Message
> > From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=OYyR_buFtY9gAqr4ZRkVL4ZcyMr1O8JGEI7dhySEMh0qteZ0QMUXIqOTkEmDQaBG4_aN4goZJp62Bok]tracy@e...[/url
> > Sent: Friday, February 02, 2001 6:18 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> >
> > Hi Larry,
> >
> > The gate itself would have to be designed around the ball and what it
> > is rolling on, etc etc,--more information is needed!
> >
> > If the ball itself is 8 inches in diameter and rolling on a smooth
> > track, then the ball itself might break the light beam and the pulsin
> > command could work on that time of eclipse directly. Alternatively,
> > the Stamp might need an external flip flop, set by one sensor and
> > reset by a second sensor farther downstream,
> >
> > The problem with pulsin command is that it will not wait forever for
> > the leading edge of the ball. It will time out after 0.13 seconds.
> > So the following BS2 program has a chance of missing the leading edge
> > of the pulse (about 0.4% of asynchronous events):
> >
> > loop:
> > pulsin 0,1,x
> > branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> > ' ...deal with measurement here
> >
> > The best bet would be to have some way to anticipate the arrival of
> > the ball, anticipate by somewhere between 1 and 130 milliseconds.
> > That might be hooked to the system that releases the ball, or it
> > might be an additional photo gate upstream. Those additional parts
> > might make it worthwhile to spring for something like the PIC project
> > you described in your earlier message, or the PAK-VII, or Steve
> > Parkis' TM-1.
> >
> > -- Tracy Allen
> > electronically monitored ecosystems
> > http://www.emesystems.com
> >
> > >How would this work Tracy
> > >
> > >would you measure the size of the object and use one gate or use one
> > >gate to go high and the second to turn off and use pulsin to measure
> > >the time per a set distance?
> > >
> > >Tracy Allen wrote:
> > >>
> > >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> > >> >I want to measure the speed of a ball traveling between 200 and
> > >>350 feet per
> > >> >second. i would like to have an accuracy of 5 ft per second. i plan
> on
> > >> >using some sort of 'light gates' and measure the interval of time it
> > takes
> > >> >the ball to break both gates... however, the distance between the
> gates
> > can
> > >> >be a maximum of about 8 inches... this means the stamp would have
> > >>to measure
> > >> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
> > would
> > >> >have to be .000038 sec to achieve 5 ft/sec.
> > >> >
> > >> >so the question is... can any of the stamps measure this time
> > interval...
> > >> >if not, does anyone know of something which is small and affordable
> that
> > >> >will?
> > >> >
> > >> >Thanks
> > >>
> > >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> > >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > > > BS2P can resolve to 0.8 microseconds. That is well within your
> > > > specifications.
> > > >
> > > > -- Tracy
"The IR modules are set for 40khz this is so lighting will not set them
off"
Could you give me a quick hint on the principles involved here, I don't see
how this would prevent a false reading from the lighting.
I keep seeing this "chopping" of signals but not sure why its done or what
the advantages are.
Why not just set it up as a continuous IR beam?
TIA,
Mark
Original Message
From: Larry gaminde <lgaminde@t...>
To: basicstamps@yahoogroups.com <basicstamps@yahoogroups.com>
Date: Friday, February 02, 2001 4:22 PM
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
:Well a cheep start would be a 4060 chip and resonator two or three IR
:led's and two or three of the radio shack IR modules about 10.00 in
[noparse]:p[/noparse]arts the lights are pulsed at 40 khz using the 4060 chip. The IR
:modules are set for 40khz this is so lighting will not set them off,
:with holes on opposite sides one led and one sensor at each stage
:three total or two total and use the Pulsin that tracy suggested
:reading between two sensors or reading the time to pass one sensor and
:use the other sensor for telling the stamp a ball is coming and get
[noparse]:p[/noparse]ulsin ready.
:
:"Jason W. Day" wrote:
:>
:> the tube can be drilled, is drilled... both inside and leaving the tube
:> would be options, but leaving the tube, the sensor would have to be
mounted
:> to the end of the tube and not stick out.. the ball is made of mostly
:> vegetable oil and water= (gelatin).
:>
:>
Original Message
:> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4wlsWOguVNblwpOgni9c4KnwPmMzAT8CQKPNBhEKX8mHM6Hg1z5GQE2eMg8KesK4M8ZR3r6QsxbM3A]lgaminde@t...[/url
:> Sent: Friday, February 02, 2001 6:57 PM
:> To: basicstamps@yahoogroups.com
:> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
:>
:> can the tube be drilled do you want to measure it in the tube or
:> leaving the tube will all balls be the same size ( can't believe I
:> said that ) and what are they made of.
:>
:> "Jason W. Day" wrote:
:> >
:> > the ball is 0.68 in in diameter and is traveling through a straight
tube.
:> >
:> >
Original Message
:> > From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8egrrNnY0cX4hER8uM5F_p-QraafIwkjUdnnlnGarZbbvOQG9VmJzIqZ0Mag23N7Q1yvAyIbZqaSsKk]tracy@e...[/url
:> > Sent: Friday, February 02, 2001 6:18 PM
:> > To: basicstamps@yahoogroups.com
:> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
:> >
:> > Hi Larry,
:> >
:> > The gate itself would have to be designed around the ball and what it
:> > is rolling on, etc etc,--more information is needed!
:> >
:> > If the ball itself is 8 inches in diameter and rolling on a smooth
:> > track, then the ball itself might break the light beam and the pulsin
:> > command could work on that time of eclipse directly. Alternatively,
:> > the Stamp might need an external flip flop, set by one sensor and
:> > reset by a second sensor farther downstream,
:> >
:> > The problem with pulsin command is that it will not wait forever for
:> > the leading edge of the ball. It will time out after 0.13 seconds.
:> > So the following BS2 program has a chance of missing the leading edge
:> > of the pulse (about 0.4% of asynchronous events):
:> >
:> > loop:
:> > pulsin 0,1,x
:> > branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
:> > ' ...deal with measurement here
:> >
:> > The best bet would be to have some way to anticipate the arrival of
:> > the ball, anticipate by somewhere between 1 and 130 milliseconds.
:> > That might be hooked to the system that releases the ball, or it
:> > might be an additional photo gate upstream. Those additional parts
:> > might make it worthwhile to spring for something like the PIC project
:> > you described in your earlier message, or the PAK-VII, or Steve
:> > Parkis' TM-1.
:> >
:> > -- Tracy Allen
:> > electronically monitored ecosystems
:> > http://www.emesystems.com
:> >
:> > >How would this work Tracy
:> > >
:> > >would you measure the size of the object and use one gate or use one
:> > >gate to go high and the second to turn off and use pulsin to measure
:> > >the time per a set distance?
:> > >
:> > >Tracy Allen wrote:
:> > >>
:> > >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
:> > >> >I want to measure the speed of a ball traveling between 200 and
:> > >>350 feet per
:> > >> >second. i would like to have an accuracy of 5 ft per second. i
plan
:> on
:> > >> >using some sort of 'light gates' and measure the interval of time
it
:> > takes
:> > >> >the ball to break both gates... however, the distance between the
:> gates
:> > can
:> > >> >be a maximum of about 8 inches... this means the stamp would have
:> > >>to measure
:> > >> >an interval of time of 0.001905 sec at 350 ft/sec. and the
accurracy
:> > would
:> > >> >have to be .000038 sec to achieve 5 ft/sec.
:> > >> >
:> > >> >so the question is... can any of the stamps measure this time
:> > interval...
:> > >> >if not, does anyone know of something which is small and affordable
:> that
:> > >> >will?
:> > >> >
:> > >> >Thanks
:> > >>
:> > >> The PULSIN command on the BS2 and BS2e can resolve time to 2
:> > >> microseconds in an interval of up to 0.13 second, and the BS2sx and
:> > > > BS2P can resolve to 0.8 microseconds. That is well within your
:> > > > specifications.
:> > > >
:> > > > -- Tracy
:
:
:
:
Original Message
From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iNQoPTJGmky16PfE9M-opQV13sjGZW1uMEGTilMRSe-9EIyq3_X5jIjtaLYWdJCblIxxXx4QzVi5wA]lgaminde@t...[/url
Sent: Friday, February 02, 2001 7:20 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
On second thought I hope light will not shine through the gelatin is
it clear or color added
"Jason W. Day" wrote:
>
> the tube can be drilled, is drilled... both inside and leaving the tube
> would be options, but leaving the tube, the sensor would have to be
mounted
> to the end of the tube and not stick out.. the ball is made of mostly
> vegetable oil and water= (gelatin).
>
>
Original Message
> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iNQoPTJGmky16PfE9M-opQV13sjGZW1uMEGTilMRSe-9EIyq3_X5jIjtaLYWdJCblIxxXx4QzVi5wA]lgaminde@t...[/url
> Sent: Friday, February 02, 2001 6:57 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> can the tube be drilled do you want to measure it in the tube or
> leaving the tube will all balls be the same size ( can't believe I
> said that ) and what are they made of.
>
> "Jason W. Day" wrote:
> >
> > the ball is 0.68 in in diameter and is traveling through a straight
tube.
> >
> >
Original Message
> > From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_O-1GEyazlyoOG9SDweTf9HLyIIh0SyKCu_jhSB_JvHg1bXB_SRwjVKXZLZM1vHxJTFmIMVi7ph8EQ]tracy@e...[/url
> > Sent: Friday, February 02, 2001 6:18 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> >
> > Hi Larry,
> >
> > The gate itself would have to be designed around the ball and what it
> > is rolling on, etc etc,--more information is needed!
> >
> > If the ball itself is 8 inches in diameter and rolling on a smooth
> > track, then the ball itself might break the light beam and the pulsin
> > command could work on that time of eclipse directly. Alternatively,
> > the Stamp might need an external flip flop, set by one sensor and
> > reset by a second sensor farther downstream,
> >
> > The problem with pulsin command is that it will not wait forever for
> > the leading edge of the ball. It will time out after 0.13 seconds.
> > So the following BS2 program has a chance of missing the leading edge
> > of the pulse (about 0.4% of asynchronous events):
> >
> > loop:
> > pulsin 0,1,x
> > branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> > ' ...deal with measurement here
> >
> > The best bet would be to have some way to anticipate the arrival of
> > the ball, anticipate by somewhere between 1 and 130 milliseconds.
> > That might be hooked to the system that releases the ball, or it
> > might be an additional photo gate upstream. Those additional parts
> > might make it worthwhile to spring for something like the PIC project
> > you described in your earlier message, or the PAK-VII, or Steve
> > Parkis' TM-1.
> >
> > -- Tracy Allen
> > electronically monitored ecosystems
> > http://www.emesystems.com
> >
> > >How would this work Tracy
> > >
> > >would you measure the size of the object and use one gate or use one
> > >gate to go high and the second to turn off and use pulsin to measure
> > >the time per a set distance?
> > >
> > >Tracy Allen wrote:
> > >>
> > >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> > >> >I want to measure the speed of a ball traveling between 200 and
> > >>350 feet per
> > >> >second. i would like to have an accuracy of 5 ft per second. i plan
> on
> > >> >using some sort of 'light gates' and measure the interval of time it
> > takes
> > >> >the ball to break both gates... however, the distance between the
> gates
> > can
> > >> >be a maximum of about 8 inches... this means the stamp would have
> > >>to measure
> > >> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy
> > would
> > >> >have to be .000038 sec to achieve 5 ft/sec.
> > >> >
> > >> >so the question is... can any of the stamps measure this time
> > interval...
> > >> >if not, does anyone know of something which is small and affordable
> that
> > >> >will?
> > >> >
> > >> >Thanks
> > >>
> > >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> > >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> > > > BS2P can resolve to 0.8 microseconds. That is well within your
> > > > specifications.
> > > >
> > > > -- Tracy
chronograph to measure the speed of paintballs! For your money
Oehler(?spelling) makes a unit with skyscreens for less than $200 that can
resolve 100 to 5000 fps. The giveaway to the paintball identity was .68
caliber and non-metallic nature of the projectile.
off, but I guess it didn't... I'm not trying to conceal anything, I have a
regular chronograph, but I want something that is part of the gun. most
guns now are electro-pneumatic, and some have LCD's..ect. just trying to
add a little more to the cost [noparse]:)[/noparse]
Original Message
From: C. Bosard [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=7c85qjPRqb6VhnT_lF77Yuq8GFxTQxIvdt_k1yPp704AR0y58vUMQnFhkXq0zWfstANcXlTmZgq1sEZveVh7]bosardc@n...[/url
Sent: Saturday, February 03, 2001 11:45 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
to the originator of this thread, just fess up that you are trying to make a
chronograph to measure the speed of paintballs! For your money
Oehler(?spelling) makes a unit with skyscreens for less than $200 that can
resolve 100 to 5000 fps. The giveaway to the paintball identity was .68
caliber and non-metallic nature of the projectile.
enough!
Most lighting will not oscillate at 40 KHZ ( I have had some
interference with florescent lights and sunlight ) also if you install
the sensor in a tube where direct lighting does not hit it you should
have no problems. The IR. 40 khz receiver will not work with non
oscillating light it needs to see the oscillation. In a gun barrel
just a photo transistor and led would work I guess???
techno masai wrote:
>
> Hi Larry,
>
> "The IR modules are set for 40khz this is so lighting will not set them
> off"
>
> Could you give me a quick hint on the principles involved here, I don't see
> how this would prevent a false reading from the lighting.
>
> I keep seeing this "chopping" of signals but not sure why its done or what
> the advantages are.
>
> Why not just set it up as a continuous IR beam?
>
> TIA,
>
> Mark
>
Original Message
> From: Larry gaminde <lgaminde@t...>
> To: basicstamps@yahoogroups.com <basicstamps@yahoogroups.com>
> Date: Friday, February 02, 2001 4:22 PM
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> :Well a cheep start would be a 4060 chip and resonator two or three IR
> :led's and two or three of the radio shack IR modules about 10.00 in
> [noparse]:p[/noparse]arts the lights are pulsed at 40 khz using the 4060 chip. The IR
> :modules are set for 40khz this is so lighting will not set them off,
> :with holes on opposite sides one led and one sensor at each stage
> :three total or two total and use the Pulsin that tracy suggested
> :reading between two sensors or reading the time to pass one sensor and
> :use the other sensor for telling the stamp a ball is coming and get
> [noparse]:p[/noparse]ulsin ready.
> :
> :"Jason W. Day" wrote:
> :>
> :> the tube can be drilled, is drilled... both inside and leaving the tube
> :> would be options, but leaving the tube, the sensor would have to be
> mounted
> :> to the end of the tube and not stick out.. the ball is made of mostly
> :> vegetable oil and water= (gelatin).
> :>
> :>
Original Message
> :> From: Larry gaminde [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8ve9CF6aob6CIhb8C7AGAdOi32lov90zkaePLv8cVKa_sAxE26be3XSPD5KOMWo8FChfU038GsD6G6N4]lgaminde@t...[/url
> :> Sent: Friday, February 02, 2001 6:57 PM
> :> To: basicstamps@yahoogroups.com
> :> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> :>
> :> can the tube be drilled do you want to measure it in the tube or
> :> leaving the tube will all balls be the same size ( can't believe I
> :> said that ) and what are they made of.
> :>
> :> "Jason W. Day" wrote:
> :> >
> :> > the ball is 0.68 in in diameter and is traveling through a straight
> tube.
> :> >
> :> >
Original Message
> :> > From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KM2oMTyi6A6eiSl3x7Ukqqe5Jqbxs4XnqDzHqCUt2mgTkiKZGQ5Br2oUXfQ0Tx0b3M12VH8MD53B1EUxyQ]tracy@e...[/url
> :> > Sent: Friday, February 02, 2001 6:18 PM
> :> > To: basicstamps@yahoogroups.com
> :> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> :> >
> :> > Hi Larry,
> :> >
> :> > The gate itself would have to be designed around the ball and what it
> :> > is rolling on, etc etc,--more information is needed!
> :> >
> :> > If the ball itself is 8 inches in diameter and rolling on a smooth
> :> > track, then the ball itself might break the light beam and the pulsin
> :> > command could work on that time of eclipse directly. Alternatively,
> :> > the Stamp might need an external flip flop, set by one sensor and
> :> > reset by a second sensor farther downstream,
> :> >
> :> > The problem with pulsin command is that it will not wait forever for
> :> > the leading edge of the ball. It will time out after 0.13 seconds.
> :> > So the following BS2 program has a chance of missing the leading edge
> :> > of the pulse (about 0.4% of asynchronous events):
> :> >
> :> > loop:
> :> > pulsin 0,1,x
> :> > branch x,[noparse][[/noparse]loop] ' branch back if no pulse detected
> :> > ' ...deal with measurement here
> :> >
> :> > The best bet would be to have some way to anticipate the arrival of
> :> > the ball, anticipate by somewhere between 1 and 130 milliseconds.
> :> > That might be hooked to the system that releases the ball, or it
> :> > might be an additional photo gate upstream. Those additional parts
> :> > might make it worthwhile to spring for something like the PIC project
> :> > you described in your earlier message, or the PAK-VII, or Steve
> :> > Parkis' TM-1.
> :> >
> :> > -- Tracy Allen
> :> > electronically monitored ecosystems
> :> > http://www.emesystems.com
> :> >
> :> > >How would this work Tracy
> :> > >
> :> > >would you measure the size of the object and use one gate or use one
> :> > >gate to go high and the second to turn off and use pulsin to measure
> :> > >the time per a set distance?
> :> > >
> :> > >Tracy Allen wrote:
> :> > >>
> :> > >> At 5:37 PM -0500 2/1/01, Jason W. Day wrote:
> :> > >> >I want to measure the speed of a ball traveling between 200 and
> :> > >>350 feet per
> :> > >> >second. i would like to have an accuracy of 5 ft per second. i
> plan
> :> on
> :> > >> >using some sort of 'light gates' and measure the interval of time
> it
> :> > takes
> :> > >> >the ball to break both gates... however, the distance between the
> :> gates
> :> > can
> :> > >> >be a maximum of about 8 inches... this means the stamp would have
> :> > >>to measure
> :> > >> >an interval of time of 0.001905 sec at 350 ft/sec. and the
> accurracy
> :> > would
> :> > >> >have to be .000038 sec to achieve 5 ft/sec.
> :> > >> >
> :> > >> >so the question is... can any of the stamps measure this time
> :> > interval...
> :> > >> >if not, does anyone know of something which is small and affordable
> :> that
> :> > >> >will?
> :> > >> >
> :> > >> >Thanks
> :> > >>
> :> > >> The PULSIN command on the BS2 and BS2e can resolve time to 2
> :> > >> microseconds in an interval of up to 0.13 second, and the BS2sx and
> :> > > > BS2P can resolve to 0.8 microseconds. That is well within your
> :> > > > specifications.
> :> > > >
> :> > > > -- Tracy
> :
> :
> :
> :
Be all you can be
"Jason W. Day" wrote:
>
> yeah it is for paintballs, I thought the 0.68 and gelatin would through you
> off, but I guess it didn't... I'm not trying to conceal anything, I have a
> regular chronograph, but I want something that is part of the gun. most
> guns now are electro-pneumatic, and some have LCD's..ect. just trying to
> add a little more to the cost [noparse]:)[/noparse]
>
>
Original Message
> From: C. Bosard [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=eEyw_BmFiXju-TG3WgmzSa_6g-pUCCqv7MuCup5-BGVJcLVhBlEphkCELoQh1AKzpSQ1pi5DNNTtp6IQXJSs]bosardc@n...[/url
> Sent: Saturday, February 03, 2001 11:45 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
>
> to the originator of this thread, just fess up that you are trying to make a
> chronograph to measure the speed of paintballs! For your money
> Oehler(?spelling) makes a unit with skyscreens for less than $200 that can
> resolve 100 to 5000 fps. The giveaway to the paintball identity was .68
> caliber and non-metallic nature of the projectile.
using your IR detector, you've calculated the bearing and velocity of your
target... you need to calculate your "target lead" distance, so they run
right into your projectile...
c'mon... it's just for fun (isn't it?) :-)
Don Russell
Position? Let's see.. .I'm at the corner of "Walk" and "Don't Walk"
Original Message
From: "Larry gaminde" <lgaminde@t...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, February 03, 2001 10:59 AM
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> Who cares how fast it goes, as long as you get your ( person ).
>
> Be all you can be
>
> "Jason W. Day" wrote:
> >
> > yeah it is for paintballs, I thought the 0.68 and gelatin would through
you
> > off, but I guess it didn't... I'm not trying to conceal anything, I have
a
> > regular chronograph, but I want something that is part of the gun. most
> > guns now are electro-pneumatic, and some have LCD's..ect. just trying
to
> > add a little more to the cost [noparse]:)[/noparse]
> >
> >
Original Message
> > From: C. Bosard [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=R-ZDo5rUc6nk8FyOoAtktmWYF38jMKCirQCEOebUSAIBicy1RGp0KSaBuAkKYiNMTCVszmp6aHptZuWQpPvQ]bosardc@n...[/url
> > Sent: Saturday, February 03, 2001 11:45 AM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> >
> > to the originator of this thread, just fess up that you are trying to
make a
> > chronograph to measure the speed of paintballs! For your money
> > Oehler(?spelling) makes a unit with skyscreens for less than $200 that
can
> > resolve 100 to 5000 fps. The giveaway to the paintball identity was .68
> > caliber and non-metallic nature of the projectile.
>
>
>
>
>I want to measure the speed of a ball traveling between 200 and 350 feet per
>second. i would like to have an accuracy of 5 ft per second. i plan on
>using some sort of 'light gates' and measure the interval of time it takes
>the ball to break both gates... however, the distance between the gates can
>be a maximum of about 8 inches... this means the stamp would have to measure
>an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
>have to be .000038 sec to achieve 5 ft/sec.
....
>the ball is 0.68 in in diameter and is traveling through a straight tube.
>does anyone know what some good sensors for this would be..
>the tube can be drilled, is drilled... both inside and leaving the tube
>would be options, but leaving the tube, the sensor would have to be mounted
>to the end of the tube and not stick out.. the ball is made of mostly
>vegetable oil and water= (gelatin).
The easiest solution would be if you could position the sensors
looking across the tube, and the tube is so dark that ambient light
is shielded out. Put a photosensor goes on one side and a light
emitting diode on the other. Make it an IR emitting diode, and use a
photosensor that has an IR light filter, if ambient light is any
problem.
|led| |led|
' `
' `
---->
; ;
; ;
| | | | sensors
| X | | X | in side tubes
Then the output of the photosensors then goes to a flip-flop, so
that the first signal sets it, and the second signal resets it. The
output of the flip-flop goes to the Stamp. The gelatin has to block
the light substantially, of course.
I have to ask, "what the heck is a 0.68" diameter ball doing, moving
at 350 feet per second?"
regards,
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
sport in the states. a lot of money is spent by teams, (average tournament
guns cost between $900 - $2000)...anyway, tournament rules state that the
ball can not be traveling faster than 300 feet / sec,.. so I was just
curious how easy it would be to determine the velocity with an on-gun
device.
since most people are interested in electronic gadgets.. check out some of
the merchandise on this site. (this is not a plug for the site)
http://www.wdp-paintball.co.uk/
Original Message
From: Don Russell [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nRYja6TeUwGFO__FBeD8gl-PkDWUGCSFJ54DocjEcZvgR5i68DX6x64kGBmHPHi8dOrbxbrfmTON]drussel2@s...[/url
Sent: Saturday, February 03, 2001 2:13 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
Let's see.... you know the muzzle velocity... you've aquired your target
using your IR detector, you've calculated the bearing and velocity of your
target... you need to calculate your "target lead" distance, so they run
right into your projectile...
c'mon... it's just for fun (isn't it?) :-)
Don Russell
Position? Let's see.. .I'm at the corner of "Walk" and "Don't Walk"
Original Message
From: "Larry gaminde" <lgaminde@t...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, February 03, 2001 10:59 AM
Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> Who cares how fast it goes, as long as you get your ( person ).
>
> Be all you can be
>
> "Jason W. Day" wrote:
> >
> > yeah it is for paintballs, I thought the 0.68 and gelatin would through
you
> > off, but I guess it didn't... I'm not trying to conceal anything, I have
a
> > regular chronograph, but I want something that is part of the gun. most
> > guns now are electro-pneumatic, and some have LCD's..ect. just trying
to
> > add a little more to the cost [noparse]:)[/noparse]
> >
> >
Original Message
> > From: C. Bosard [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hPJCvfq3Ii_PRqpSn30_vVAfzfoypfIaw84hQ-VS9SqyDnVx94rxYh2xFdg0zexez28i-Ag6zkjht5bn-OCQ]bosardc@n...[/url
> > Sent: Saturday, February 03, 2001 11:45 AM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] How Fast?
> >
> > to the originator of this thread, just fess up that you are trying to
make a
> > chronograph to measure the speed of paintballs! For your money
> > Oehler(?spelling) makes a unit with skyscreens for less than $200 that
can
> > resolve 100 to 5000 fps. The giveaway to the paintball identity was .68
> > caliber and non-metallic nature of the projectile.
>
>
>
>
the balls are shot out of a paintball gun and then break on an opponent
(ouch).... here are some tournament pics if interested... they are from the
University of Cincinnati paintball team when we were at a college tournament
in Columbus Ohio.. the web site is under construction but you should get the
idea.
http://www.soa.uc.edu/org/paintball/ go to "Event Photos"
to all,
this is the last I will send of paintball info.. if you want more, just
email me directly or type in paintball into yahoo.
Original Message
From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=oVkPt4lpSbyDhT-Z34AGRn2S6TmD_22dqFRAWwmJazBoEf5lJsDLZYXTCqs5zZuH1DTZzoQVbDAkItzx]tracy@e...[/url
Sent: Saturday, February 03, 2001 2:54 PM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] How Fast?
Jason wrote:
>I want to measure the speed of a ball traveling between 200 and 350 feet
per
>second. i would like to have an accuracy of 5 ft per second. i plan on
>using some sort of 'light gates' and measure the interval of time it takes
>the ball to break both gates... however, the distance between the gates can
>be a maximum of about 8 inches... this means the stamp would have to
measure
>an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
>have to be .000038 sec to achieve 5 ft/sec.
....
>the ball is 0.68 in in diameter and is traveling through a straight tube.
>does anyone know what some good sensors for this would be..
>the tube can be drilled, is drilled... both inside and leaving the tube
>would be options, but leaving the tube, the sensor would have to be mounted
>to the end of the tube and not stick out.. the ball is made of mostly
>vegetable oil and water= (gelatin).
The easiest solution would be if you could position the sensors
looking across the tube, and the tube is so dark that ambient light
is shielded out. Put a photosensor goes on one side and a light
emitting diode on the other. Make it an IR emitting diode, and use a
photosensor that has an IR light filter, if ambient light is any
problem.
|led| |led|
' `
' `
---->
; ;
; ;
| | | | sensors
| X | | X | in side tubes
Then the output of the photosensors then goes to a flip-flop, so
that the first signal sets it, and the second signal resets it. The
output of the flip-flop goes to the Stamp. The gelatin has to block
the light substantially, of course.
I have to ask, "what the heck is a 0.68" diameter ball doing, moving
at 350 feet per second?"
regards,
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
>
> Jason wrote:
> >I want to measure the speed of a ball traveling between 200 and 350 feet per
> >second. i would like to have an accuracy of 5 ft per second. i plan on
> >using some sort of 'light gates' and measure the interval of time it takes
> >the ball to break both gates... however, the distance between the gates can
> >be a maximum of about 8 inches... this means the stamp would have to measure
> >an interval of time of 0.001905 sec at 350 ft/sec. and the accurracy would
> >have to be .000038 sec to achieve 5 ft/sec.
> ....
> >the ball is 0.68 in in diameter and is traveling through a straight tube.
> >does anyone know what some good sensors for this would be..
> >the tube can be drilled, is drilled... both inside and leaving the tube
> >would be options, but leaving the tube, the sensor would have to be mounted
> >to the end of the tube and not stick out.. the ball is made of mostly
> >vegetable oil and water= (gelatin).
>
> The easiest solution would be if you could position the sensors
> looking across the tube, and the tube is so dark that ambient light
> is shielded out. Put a photosensor goes on one side and a light
> emitting diode on the other. Make it an IR emitting diode, and use a
> photosensor that has an IR light filter, if ambient light is any
> problem.
>
>
> |led| |led|
>
' `
' `
> ---->
>
; ;
; ;
> | | | | sensors
> | X | | X | in side tubes
>
>
> Then the output of the photosensors then goes to a flip-flop, so
> that the first signal sets it, and the second signal resets it. The
> output of the flip-flop goes to the Stamp. The gelatin has to block
> the light substantially, of course.
>
> I have to ask, "what the heck is a 0.68" diameter ball doing, moving
> at 350 feet per second?"
>
> regards,
> -- Tracy Allen
> electronically monitored ecosystems
> http://www.emesystems.com
>
>
>
Just an idea, but it may be possible to detect the two points
capacitively
if the "tube" was not metallic. Same Idea....
V+ OUT V+ OUT
C1 C2 ----> C3 C4
GND GND GND GND
C1
GND >----||----> V+
C3
GND >----||----> V+
T1 T2
|\ |\
C2 | | | |
GND >----||----o | | | |
| | \ | \
o--> Out (SCOPE) ----
C4 |
GND >----||----o
Note:
The time interval between T1 and T2's rising edge could
be used against the known distance of C2 and C4 to detect
the objects speed.
You could also use C1 and C3 and eliminate C2 and C4 if you
place a resistor in series with each capacitor. The output
would be inverse with a DIP in capacitor voltage at each ball
crossing.
Method #1)
I would construct the capacitors in a way that would circumference
the tube with the exception of two 1/8th inch slits 180 degrees
apart.
Method #2)
Use a total of 3 plates to form C1 and C2 with the middle plate
being a common GND and likewise for C3 and C4. Each plate would
circumference the tube without any breaks.
V+ GND OUT V+ GND OUT
---
---
C1 C2 ----> C3 C4
---
---
V+ GND OUT V+ GND OUT
If you have access to a scope.... EXPERIMENT!
Beau Schwabe
(Mask Designer)
Network Products Division
National Semiconductor Corporation
500 Pinnacle Court, Suite 525 Mail Stop GA1
Norcross, GA 30071