Rpm
Archiver
Posts: 46,084
Hello,
I am wondering what is the best way to measure the rpm of a axle.
Would it be using the pulsin command with multiple ticks on the axle
or use only one tick and use some kind of timer?
U guys tell me.
Thanks,
Kevin Jones
I am wondering what is the best way to measure the rpm of a axle.
Would it be using the pulsin command with multiple ticks on the axle
or use only one tick and use some kind of timer?
U guys tell me.
Thanks,
Kevin Jones
Comments
Doug
> To: basicstamps@yahoogroups.com
> From: "Classified" <kj62@y...>
> Date: Thu, 26 Apr 2001 04:16:41 -0000
> Reply-to: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Rpm
> Hello,
> I am wondering what is the best way to measure the rpm of a axle.
> Would it be using the pulsin command with multiple ticks on the axle
> or use only one tick and use some kind of timer?
>
> U guys tell me.
>
> Thanks,
> Kevin Jones
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
I need a way to measure rpm without tying(stopping to read the rpm)
up the basic stamp. Is there a simple way to count the rpms and send
the data to the basic stamp some way. I have tryed using the lm2907
but i havent had much luck with it. any ideas?
Kevin jones
capacitor (like a F to V) and reading voltage with RCTime.?
ACJacques
Classified wrote:
>
> Hello,
>
> I need a way to measure rpm without tying(stopping to read the rpm)
> up the basic stamp. Is there a simple way to count the rpms and send
> the data to the basic stamp some way. I have tryed using the lm2907
> but i havent had much luck with it. any ideas?
>
> Kevin jones
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
the stamp is the data to be read by a adc or serial input...
i need it to not slow down the stamp all i want to do with it is read
in the data because the program i am running is allready slow enough.
kevin
--- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> What about sensing RPM with some device that periodically charges a
> capacitor (like a F to V) and reading voltage with RCTime.?
> ACJacques
> Classified wrote:
> >
> > Hello,
> >
> > I need a way to measure rpm without tying(stopping to read the
rpm)
> > up the basic stamp. Is there a simple way to count the rpms and
send
> > the data to the basic stamp some way. I have tryed using the
lm2907
> > but i havent had much luck with it. any ideas?
> >
> > Kevin jones
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
can measure and count up to 8 pulses at once. Most tachometer applications
I'm familiar with generate pulses. You either count the pulses per unit
time, measure the width of the pulse, or measure the gap between pulses. Any
of those things will let you figure RPM.
The PAK-VII never stops and the Stamp can read it at its leisure.
Regards,
Al Williams
AWC
http://www.al-williams.com/awce/pak7.htm
>
Original Message
> From: Classified [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=5_U1r41X9ksiXJleEhPvxw65tjNHOmau_X9bm8Bu2r7kaW0qRGpWRomTSJjllQJERwtD2Q1C]kj62@y...[/url
> Sent: Monday, July 09, 2001 7:35 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Rpm
>
>
> The device needs to be stamp independent and all it needs to have for
> the stamp is the data to be read by a adc or serial input...
> i need it to not slow down the stamp all i want to do with it is read
> in the data because the program i am running is allready slow enough.
>
> kevin
>
>
>
>
>
>
> --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > What about sensing RPM with some device that periodically charges a
> > capacitor (like a F to V) and reading voltage with RCTime.?
> > ACJacques
> > Classified wrote:
> > >
> > > Hello,
> > >
> > > I need a way to measure rpm without tying(stopping to read the
> rpm)
> > > up the basic stamp. Is there a simple way to count the rpms and
> send
> > > the data to the basic stamp some way. I have tryed using the
> lm2907
> > > but i havent had much luck with it. any ideas?
> > >
> > > Kevin jones
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@y...
> > > from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
a 2.2 in diameter tire will make the car go 178 mph !!!
my guess is that might be the motor speed
there is probably a 6:1 or 7:1 reduction between the pinion and the spur
that would bring the
vehicle speed down to 25-30 mph
Richard
PS if CPU speed is a problem them measure speed on axle rather than
rotor (armature).
Original Message
From: "K Jones" <kj62@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, July 10, 2001 12:11 PM
Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> Thanks!
> This processor seems to be the solution. Oh ya the axle will be
> spinning at a max 27,000 rpm
> I am using this to measure the speed of my toy r/c car.
>
> Thanks again,
> Kevin Jones
>
>
> --- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> > If I understand your question, you can use a PAK-VII to do this. A
PAK-VII
> > can measure and count up to 8 pulses at once. Most tachometer
applications
> > I'm familiar with generate pulses. You either count the pulses per unit
> > time, measure the width of the pulse, or measure the gap between pulses.
Any
> > of those things will let you figure RPM.
> >
> > The PAK-VII never stops and the Stamp can read it at its leisure.
> >
> > Regards,
> >
> > Al Williams
> > AWC
> > http://www.al-williams.com/awce/pak7.htm
> >
> >
> > >
Original Message
> > > From: Classified [noparse][[/noparse]mailto:kj62@y...]
> > > Sent: Monday, July 09, 2001 7:35 PM
> > > To: basicstamps@y...
> > > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> > >
> > >
> > > The device needs to be stamp independent and all it needs to have for
> > > the stamp is the data to be read by a adc or serial input...
> > > i need it to not slow down the stamp all i want to do with it is read
> > > in the data because the program i am running is allready slow enough.
> > >
> > > kevin
> > >
> > >
> > >
> > >
> > >
> > >
> > > --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > > > What about sensing RPM with some device that periodically charges a
> > > > capacitor (like a F to V) and reading voltage with RCTime.?
> > > > ACJacques
> > > > Classified wrote:
> > > > >
> > > > > Hello,
> > > > >
> > > > > I need a way to measure rpm without tying(stopping to read the
> > > rpm)
> > > > > up the basic stamp. Is there a simple way to count the rpms and
> > > send
> > > > > the data to the basic stamp some way. I have tryed using the
> > > lm2907
> > > > > but i havent had much luck with it. any ideas?
> > > > >
> > > > > Kevin jones
> > > > >
> > > > > To UNSUBSCRIBE, just send mail to:
> > > > > basicstamps-unsubscribe@y...
> > > > > from the same email address that you subscribed. Text in the
> > > Subject and Body of the message will be ignored.
> > > > >
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > > http://docs.yahoo.com/info/terms/
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@y...
> > > from the same email address that you subscribed. Text in the
> > > Subject and Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> > >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
This processor seems to be the solution. Oh ya the axle will be
spinning at a max 27,000 rpm
I am using this to measure the speed of my toy r/c car.
Thanks again,
Kevin Jones
--- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> If I understand your question, you can use a PAK-VII to do this. A PAK-VII
> can measure and count up to 8 pulses at once. Most tachometer applications
> I'm familiar with generate pulses. You either count the pulses per unit
> time, measure the width of the pulse, or measure the gap between pulses. Any
> of those things will let you figure RPM.
>
> The PAK-VII never stops and the Stamp can read it at its leisure.
>
> Regards,
>
> Al Williams
> AWC
> http://www.al-williams.com/awce/pak7.htm
>
>
> >
Original Message
> > From: Classified [noparse][[/noparse]mailto:kj62@y...]
> > Sent: Monday, July 09, 2001 7:35 PM
> > To: basicstamps@y...
> > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> >
> >
> > The device needs to be stamp independent and all it needs to have for
> > the stamp is the data to be read by a adc or serial input...
> > i need it to not slow down the stamp all i want to do with it is read
> > in the data because the program i am running is allready slow enough.
> >
> > kevin
> >
> >
> >
> >
> >
> >
> > --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > > What about sensing RPM with some device that periodically charges a
> > > capacitor (like a F to V) and reading voltage with RCTime.?
> > > ACJacques
> > > Classified wrote:
> > > >
> > > > Hello,
> > > >
> > > > I need a way to measure rpm without tying(stopping to read the
> > rpm)
> > > > up the basic stamp. Is there a simple way to count the rpms and
> > send
> > > > the data to the basic stamp some way. I have tryed using the
> > lm2907
> > > > but i havent had much luck with it. any ideas?
> > > >
> > > > Kevin jones
> > > >
> > > > To UNSUBSCRIBE, just send mail to:
> > > > basicstamps-unsubscribe@y...
> > > > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> > > >
> > > >
> > > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> >
ya that is a little fast for an axle speed [noparse];)[/noparse] There is a median gear
reduction of 4.0 or 4:1 however you want to say it. And those rpms
were only the top of the line motors cuz i don't have the specs
infront of me. Um... Could you use the pak III processor to measure
rpms because if I understand the data sheet it can do pulsin pulsout
and it also is an i/o line expander, but does it have the same
precision as the pak just for pulsin?
Thanks,
K. Jones
--- In basicstamps@y..., "dakota" <rfriedrich@a...> wrote:
> if you are really talking about the axle then I want to see that
car
> a 2.2 in diameter tire will make the car go 178 mph !!!
>
> my guess is that might be the motor speed
>
> there is probably a 6:1 or 7:1 reduction between the pinion and the
spur
> that would bring the
> vehicle speed down to 25-30 mph
>
> Richard
>
> PS if CPU speed is a problem them measure speed on axle rather
than
> rotor (armature).
>
>
Original Message
> From: "K Jones" <kj62@y...>
> To: <basicstamps@y...>
> Sent: Tuesday, July 10, 2001 12:11 PM
> Subject: [noparse][[/noparse]basicstamps] Re: Rpm
>
>
> > Thanks!
> > This processor seems to be the solution. Oh ya the axle will be
> > spinning at a max 27,000 rpm
> > I am using this to measure the speed of my toy r/c car.
> >
> > Thanks again,
> > Kevin Jones
> >
> >
> > --- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> > > If I understand your question, you can use a PAK-VII to do
this. A
> PAK-VII
> > > can measure and count up to 8 pulses at once. Most tachometer
> applications
> > > I'm familiar with generate pulses. You either count the pulses
per unit
> > > time, measure the width of the pulse, or measure the gap
between pulses.
> Any
> > > of those things will let you figure RPM.
> > >
> > > The PAK-VII never stops and the Stamp can read it at its
leisure.
> > >
> > > Regards,
> > >
> > > Al Williams
> > > AWC
> > > http://www.al-williams.com/awce/pak7.htm
> > >
> > >
> > > >
Original Message
> > > > From: Classified [noparse][[/noparse]mailto:kj62@y...]
> > > > Sent: Monday, July 09, 2001 7:35 PM
> > > > To: basicstamps@y...
> > > > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> > > >
> > > >
> > > > The device needs to be stamp independent and all it needs to
have for
> > > > the stamp is the data to be read by a adc or serial input...
> > > > i need it to not slow down the stamp all i want to do with it
is read
> > > > in the data because the program i am running is allready slow
enough.
> > > >
> > > > kevin
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > > > > What about sensing RPM with some device that periodically
charges a
> > > > > capacitor (like a F to V) and reading voltage with RCTime.?
> > > > > ACJacques
> > > > > Classified wrote:
> > > > > >
> > > > > > Hello,
> > > > > >
> > > > > > I need a way to measure rpm without tying(stopping to
read the
> > > > rpm)
> > > > > > up the basic stamp. Is there a simple way to count the
rpms and
> > > > send
> > > > > > the data to the basic stamp some way. I have tryed using
the
> > > > lm2907
> > > > > > but i havent had much luck with it. any ideas?
> > > > > >
> > > > > > Kevin jones
> > > > > >
> > > > > > To UNSUBSCRIBE, just send mail to:
> > > > > > basicstamps-unsubscribe@y...
> > > > > > from the same email address that you subscribed. Text in
the
> > > > Subject and Body of the message will be ignored.
> > > > > >
> > > > > >
> > > > > > Your use of Yahoo! Groups is subject to
> > > > http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > > > To UNSUBSCRIBE, just send mail to:
> > > > basicstamps-unsubscribe@y...
> > > > from the same email address that you subscribed. Text in the
> > > > Subject and Body of the message will be ignored.
> > > >
> > > >
> > > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > > >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
other things) but they also do one thing at a time. The Stamp can do one
thing and the PAKIII can do another thing. The PAK-VII is ideal here because
it measure 8 channels at one time. It also performs several different
measurements at once (count and duration).
Hope that helps.
Al Williams
AWC
http://www.al-williams.com/awce
>
Original Message
> From: K Jones [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=f9NbqBSio_RmRnb8zUlIz3rCJ9Aowe2JZlR1q81e2eVXzvX9AOJ5KaQ3cQMgmhXU98XL0g]kj62@y...[/url
> Sent: Wednesday, July 11, 2001 1:03 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Rpm
>
>
> heheh
> ya that is a little fast for an axle speed [noparse];)[/noparse] There is a median gear
> reduction of 4.0 or 4:1 however you want to say it. And those rpms
> were only the top of the line motors cuz i don't have the specs
> infront of me. Um... Could you use the pak III processor to measure
> rpms because if I understand the data sheet it can do pulsin pulsout
> and it also is an i/o line expander, but does it have the same
> precision as the pak just for pulsin?
>
> Thanks,
> K. Jones
>
> --- In basicstamps@y..., "dakota" <rfriedrich@a...> wrote:
> > if you are really talking about the axle then I want to see that
> car
> > a 2.2 in diameter tire will make the car go 178 mph !!!
> >
> > my guess is that might be the motor speed
> >
> > there is probably a 6:1 or 7:1 reduction between the pinion and the
> spur
> > that would bring the
> > vehicle speed down to 25-30 mph
> >
> > Richard
> >
> > PS if CPU speed is a problem them measure speed on axle rather
> than
> > rotor (armature).
> >
> >
Original Message
> > From: "K Jones" <kj62@y...>
> > To: <basicstamps@y...>
> > Sent: Tuesday, July 10, 2001 12:11 PM
> > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> >
> >
> > > Thanks!
> > > This processor seems to be the solution. Oh ya the axle will be
> > > spinning at a max 27,000 rpm
> > > I am using this to measure the speed of my toy r/c car.
> > >
> > > Thanks again,
> > > Kevin Jones
> > >
> > >
> > > --- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> > > > If I understand your question, you can use a PAK-VII to do
> this. A
> > PAK-VII
> > > > can measure and count up to 8 pulses at once. Most tachometer
> > applications
> > > > I'm familiar with generate pulses. You either count the pulses
> per unit
> > > > time, measure the width of the pulse, or measure the gap
> between pulses.
> > Any
> > > > of those things will let you figure RPM.
> > > >
> > > > The PAK-VII never stops and the Stamp can read it at its
> leisure.
> > > >
> > > > Regards,
> > > >
> > > > Al Williams
> > > > AWC
> > > > http://www.al-williams.com/awce/pak7.htm
> > > >
> > > >
> > > > >
Original Message
> > > > > From: Classified [noparse][[/noparse]mailto:kj62@y...]
> > > > > Sent: Monday, July 09, 2001 7:35 PM
> > > > > To: basicstamps@y...
> > > > > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> > > > >
> > > > >
> > > > > The device needs to be stamp independent and all it needs to
> have for
> > > > > the stamp is the data to be read by a adc or serial input...
> > > > > i need it to not slow down the stamp all i want to do with it
> is read
> > > > > in the data because the program i am running is allready slow
> enough.
> > > > >
> > > > > kevin
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > > > > > What about sensing RPM with some device that periodically
> charges a
> > > > > > capacitor (like a F to V) and reading voltage with RCTime.?
> > > > > > ACJacques
> > > > > > Classified wrote:
> > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > I need a way to measure rpm without tying(stopping to
> read the
> > > > > rpm)
> > > > > > > up the basic stamp. Is there a simple way to count the
> rpms and
> > > > > send
> > > > > > > the data to the basic stamp some way. I have tryed using
> the
> > > > > lm2907
> > > > > > > but i havent had much luck with it. any ideas?
> > > > > > >
> > > > > > > Kevin jones
> > > > > > >
> > > > > > > To UNSUBSCRIBE, just send mail to:
> > > > > > > basicstamps-unsubscribe@y...
> > > > > > > from the same email address that you subscribed. Text in
> the
> > > > > Subject and Body of the message will be ignored.
> > > > > > >
> > > > > > >
> > > > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > >
> > > > >
> > > > > To UNSUBSCRIBE, just send mail to:
> > > > > basicstamps-unsubscribe@y...
> > > > > from the same email address that you subscribed. Text in the
> > > > > Subject and Body of the message will be ignored.
> > > > >
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> > > > >
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@y...
> > > from the same email address that you subscribed. Text in the
> Subject and
> > Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
I have only used his pakV - and was happy with its results
i only deal with bx-24 - I forgot most of the stampII info
richard
Original Message
From: "K Jones" <kj62@y...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, July 11, 2001 1:02 AM
Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> heheh
> ya that is a little fast for an axle speed [noparse];)[/noparse] There is a median gear
> reduction of 4.0 or 4:1 however you want to say it. And those rpms
> were only the top of the line motors cuz i don't have the specs
> infront of me. Um... Could you use the pak III processor to measure
> rpms because if I understand the data sheet it can do pulsin pulsout
> and it also is an i/o line expander, but does it have the same
> precision as the pak just for pulsin?
>
> Thanks,
> K. Jones
>
> --- In basicstamps@y..., "dakota" <rfriedrich@a...> wrote:
> > if you are really talking about the axle then I want to see that
> car
> > a 2.2 in diameter tire will make the car go 178 mph !!!
> >
> > my guess is that might be the motor speed
> >
> > there is probably a 6:1 or 7:1 reduction between the pinion and the
> spur
> > that would bring the
> > vehicle speed down to 25-30 mph
> >
> > Richard
> >
> > PS if CPU speed is a problem them measure speed on axle rather
> than
> > rotor (armature).
> >
> >
Original Message
> > From: "K Jones" <kj62@y...>
> > To: <basicstamps@y...>
> > Sent: Tuesday, July 10, 2001 12:11 PM
> > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> >
> >
> > > Thanks!
> > > This processor seems to be the solution. Oh ya the axle will be
> > > spinning at a max 27,000 rpm
> > > I am using this to measure the speed of my toy r/c car.
> > >
> > > Thanks again,
> > > Kevin Jones
> > >
> > >
> > > --- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> > > > If I understand your question, you can use a PAK-VII to do
> this. A
> > PAK-VII
> > > > can measure and count up to 8 pulses at once. Most tachometer
> > applications
> > > > I'm familiar with generate pulses. You either count the pulses
> per unit
> > > > time, measure the width of the pulse, or measure the gap
> between pulses.
> > Any
> > > > of those things will let you figure RPM.
> > > >
> > > > The PAK-VII never stops and the Stamp can read it at its
> leisure.
> > > >
> > > > Regards,
> > > >
> > > > Al Williams
> > > > AWC
> > > > http://www.al-williams.com/awce/pak7.htm
> > > >
> > > >
> > > > >
Original Message
> > > > > From: Classified [noparse][[/noparse]mailto:kj62@y...]
> > > > > Sent: Monday, July 09, 2001 7:35 PM
> > > > > To: basicstamps@y...
> > > > > Subject: [noparse][[/noparse]basicstamps] Re: Rpm
> > > > >
> > > > >
> > > > > The device needs to be stamp independent and all it needs to
> have for
> > > > > the stamp is the data to be read by a adc or serial input...
> > > > > i need it to not slow down the stamp all i want to do with it
> is read
> > > > > in the data because the program i am running is allready slow
> enough.
> > > > >
> > > > > kevin
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --- In basicstamps@y..., AC Jacques <acjacques@i...> wrote:
> > > > > > What about sensing RPM with some device that periodically
> charges a
> > > > > > capacitor (like a F to V) and reading voltage with RCTime.?
> > > > > > ACJacques
> > > > > > Classified wrote:
> > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > I need a way to measure rpm without tying(stopping to
> read the
> > > > > rpm)
> > > > > > > up the basic stamp. Is there a simple way to count the
> rpms and
> > > > > send
> > > > > > > the data to the basic stamp some way. I have tryed using
> the
> > > > > lm2907
> > > > > > > but i havent had much luck with it. any ideas?
> > > > > > >
> > > > > > > Kevin jones
> > > > > > >
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