Pulse train
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Posts: 46,084
I want to pulse an LED and continue to have it pulse while the program
continues to execute instructions. I see I can create a pulse train but it
appears that a loop is necessary to create a pule strain. As a result I
wouldn't be able to process any other data.
My other thought was to set a port high into a stobing led and let the
hardware do the strobing.
I'd prefer to do it with software..cheaper and I can change the duty cycle.
Any ideas?
Jay
continues to execute instructions. I see I can create a pulse train but it
appears that a loop is necessary to create a pule strain. As a result I
wouldn't be able to process any other data.
My other thought was to set a port high into a stobing led and let the
hardware do the strobing.
I'd prefer to do it with software..cheaper and I can change the duty cycle.
Any ideas?
Jay
Comments
you not want to use a 555 timer ?
nagi
Original Message
From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JGghsbZVxPf684HlxnKZHcm7cpGWIOyQ9fIXzhRR1RY9jCtODSjpwuGe0xm2zZZ21e8BQrP7t7ANRkrDz8I]pcb4u@e...[/url
Sent: Saturday, November 25, 2000 8:15 PM
To: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] Pulse train
I want to pulse an LED and continue to have it pulse while the program
continues to execute instructions. I see I can create a pulse train but
it
appears that a loop is necessary to create a pule strain. As a result I
wouldn't be able to process any other data.
My other thought was to set a port high into a stobing led and let the
hardware do the strobing.
I'd prefer to do it with software..cheaper and I can change the duty
cycle.
Any ideas?
Jay
and fewer components...
Bill
At 08:23 PM 11/25/2000 -0600, you wrote:
>try using a 555 timer to do the asynchronous pulsing on the LED. Or did
>you not want to use a 555 timer ?
>
>nagi
>
>
>
>
Original Message
>From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=eUezJJwWmSYlgoeUJWU04qgQU3JLLIUBJiwf7-KLWsNh8oVZDkifgg3tM-C_baccDLY4r1qeIF0gNOZGFA]pcb4u@e...[/url
>Sent: Saturday, November 25, 2000 8:15 PM
>To: basicstamps@egroups.com
>Subject: [noparse][[/noparse]basicstamps] Pulse train
>
>
>I want to pulse an LED and continue to have it pulse while the program
>continues to execute instructions. I see I can create a pulse train but
>it
>appears that a loop is necessary to create a pule strain. As a result I
>wouldn't be able to process any other data.
>
>My other thought was to set a port high into a stobing led and let the
>hardware do the strobing.
>
>I'd prefer to do it with software..cheaper and I can change the duty
>cycle.
>
>Any ideas?
>
>Jay
>
>
>
>
>
>
>
>
>
>
started with a LO or Hi which can come from a port on the STAMP?
Jay
Original Message
From: Nagi Babu <nags@c...>
To: <basicstamps@egroups.com>
Sent: Saturday, November 25, 2000 6:23 PM
Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
> try using a 555 timer to do the asynchronous pulsing on the LED. Or did
> you not want to use a 555 timer ?
>
> nagi
>
>
>
>
Original Message
> From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=mzEHvYvzWscyfLR2_ylv6YIzWzJsYPKkiXPqS6IkXnI9aZ0W3Ntz9rqMmYmHWOEtRKQg13gfkx-7TZhNsvk]pcb4u@e...[/url
> Sent: Saturday, November 25, 2000 8:15 PM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Pulse train
>
>
> I want to pulse an LED and continue to have it pulse while the program
> continues to execute instructions. I see I can create a pulse train but
> it
> appears that a loop is necessary to create a pule strain. As a result I
> wouldn't be able to process any other data.
>
> My other thought was to set a port high into a stobing led and let the
> hardware do the strobing.
>
> I'd prefer to do it with software..cheaper and I can change the duty
> cycle.
>
> Any ideas?
>
> Jay
>
>
>
>
>
>
>
>
>
to switch off.
Original Message
From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_ynaw5u1B3-fuoRcLrQuVp2CB_GHjkvQabQnk9wi9-M87BMp_OgatLY5x5Jj1qQXV51HIKQ246kC]pcb4u@e...[/url
Sent: Saturday, November 25, 2000 9:10 PM
To: basicstamps@egroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Pulse train
I need to start and stop the train when other things occur. Can the 555
be
started with a LO or Hi which can come from a port on the STAMP?
Jay
Original Message
From: Nagi Babu <nags@c...>
To: <basicstamps@egroups.com>
Sent: Saturday, November 25, 2000 6:23 PM
Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
> try using a 555 timer to do the asynchronous pulsing on the LED. Or
did
> you not want to use a 555 timer ?
>
> nagi
>
>
>
>
Original Message
> From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_ynaw5u1B3-fuoRcLrQuVp2CB_GHjkvQabQnk9wi9-M87BMp_OgatLY5x5Jj1qQXV51HIKQ246kC]pcb4u@e...[/url
> Sent: Saturday, November 25, 2000 8:15 PM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Pulse train
>
>
> I want to pulse an LED and continue to have it pulse while the program
> continues to execute instructions. I see I can create a pulse train
but
> it
> appears that a loop is necessary to create a pule strain. As a result
I
> wouldn't be able to process any other data.
>
> My other thought was to set a port high into a stobing led and let the
> hardware do the strobing.
>
> I'd prefer to do it with software..cheaper and I can change the duty
> cycle.
>
> Any ideas?
>
> Jay
>
>
>
>
>
>
>
>
>
Missed your first post so don't know what you want to do. I have two trains
running on three tracks, all controlled by two BS2, including operation of
turnouts. If you will repeat your question maybe I can help. I do not use
timers.
Sid Weaver
Newzed@a...
Had nothing to do with trains...question was about generating a pulse train
Jay
Original Message
From: <Newzed@a...>
To: <basicstamps@egroups.com>
Sent: Sunday, November 26, 2000 5:02 AM
Subject: Re: [noparse][[/noparse]basicstamps] Pulse train
> Good Morning
>
> Missed your first post so don't know what you want to do. I have two
trains
> running on three tracks, all controlled by two BS2, including operation of
> turnouts. If you will repeat your question maybe I can help. I do not
use
> timers.
>
> Sid Weaver
> Newzed@a...
>
>
>
>
So what your saying is that I can get the 555 in Astable mode (free running)
and start and stop this astable operation with a port from the Stamp to
start the pulse train (pin 4 at 555=1) and stop the pulse train (pin 4 at
555=0)?
Are there any Stamp problems (sinking current) from pin 4 of the 555 when
the Stamp port is set to 0?
Thanks
Jay
Original Message
From: Nagi Babu <nags@c...>
To: <basicstamps@egroups.com>
Sent: Saturday, November 25, 2000 7:16 PM
Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
> yes. 555's pin 4 can be taken hi to switch on the pulseout and taken low
> to switch off.
>
>
>
>
Original Message
> From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Q6WS00z7TSq9mPh7ISu5xwW7oJ9xZYhFHIzEPFdhAo8oWyt-xLqByGI3vj4gNwB1FiaaiWNm3JmRb4TVoA]pcb4u@e...[/url
> Sent: Saturday, November 25, 2000 9:10 PM
> To: basicstamps@egroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Pulse train
>
>
> I need to start and stop the train when other things occur. Can the 555
> be
> started with a LO or Hi which can come from a port on the STAMP?
>
> Jay
>
>
Original Message
> From: Nagi Babu <nags@c...>
> To: <basicstamps@egroups.com>
> Sent: Saturday, November 25, 2000 6:23 PM
> Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
>
>
> > try using a 555 timer to do the asynchronous pulsing on the LED. Or
> did
> > you not want to use a 555 timer ?
> >
> > nagi
> >
> >
> >
> >
Original Message
> > From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Q6WS00z7TSq9mPh7ISu5xwW7oJ9xZYhFHIzEPFdhAo8oWyt-xLqByGI3vj4gNwB1FiaaiWNm3JmRb4TVoA]pcb4u@e...[/url
> > Sent: Saturday, November 25, 2000 8:15 PM
> > To: basicstamps@egroups.com
> > Subject: [noparse][[/noparse]basicstamps] Pulse train
> >
> >
> > I want to pulse an LED and continue to have it pulse while the program
> > continues to execute instructions. I see I can create a pulse train
> but
> > it
> > appears that a loop is necessary to create a pule strain. As a result
> I
> > wouldn't be able to process any other data.
> >
> > My other thought was to set a port high into a stobing led and let the
> > hardware do the strobing.
> >
> > I'd prefer to do it with software..cheaper and I can change the duty
> > cycle.
> >
> > Any ideas?
> >
> > Jay
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>
>
spec sheet about .4ma MAX. Apparently no problem for the Stamp port.
Jay
Original Message
From: Nagi Babu <nags@c...>
To: <basicstamps@egroups.com>
Sent: Saturday, November 25, 2000 7:16 PM
Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
> yes. 555's pin 4 can be taken hi to switch on the pulseout and taken low
> to switch off.
>
>
>
>
Original Message
> From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4DTzw7VRXfCKDM456ecHEdbuU_dRY8bEryAhVE06tBK3PWfmwYhM4ndBVBQ5eP4dKFnhgXiSVng3N39_ZpU]pcb4u@e...[/url
> Sent: Saturday, November 25, 2000 9:10 PM
> To: basicstamps@egroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Pulse train
>
>
> I need to start and stop the train when other things occur. Can the 555
> be
> started with a LO or Hi which can come from a port on the STAMP?
>
> Jay
>
>
Original Message
> From: Nagi Babu <nags@c...>
> To: <basicstamps@egroups.com>
> Sent: Saturday, November 25, 2000 6:23 PM
> Subject: RE: [noparse][[/noparse]basicstamps] Pulse train
>
>
> > try using a 555 timer to do the asynchronous pulsing on the LED. Or
> did
> > you not want to use a 555 timer ?
> >
> > nagi
> >
> >
> >
> >
Original Message
> > From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4DTzw7VRXfCKDM456ecHEdbuU_dRY8bEryAhVE06tBK3PWfmwYhM4ndBVBQ5eP4dKFnhgXiSVng3N39_ZpU]pcb4u@e...[/url
> > Sent: Saturday, November 25, 2000 8:15 PM
> > To: basicstamps@egroups.com
> > Subject: [noparse][[/noparse]basicstamps] Pulse train
> >
> >
> > I want to pulse an LED and continue to have it pulse while the program
> > continues to execute instructions. I see I can create a pulse train
> but
> > it
> > appears that a loop is necessary to create a pule strain. As a result
> I
> > wouldn't be able to process any other data.
> >
> > My other thought was to set a port high into a stobing led and let the
> > hardware do the strobing.
> >
> > I'd prefer to do it with software..cheaper and I can change the duty
> > cycle.
> >
> > Any ideas?
> >
> > Jay
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>
>
cycle in software, turn it on and off (either high/low/or Hi-z) and you get
8 channels with 10uS resolution or 4 channels with 5uS resolution.
Al Williams
AWC
* Control 8 servos: http://www.al-williams.com/awce/pak8.htm
>
Original Message
> From: Jay Kay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=IO5R8izTm70takB3XtPCQrcvy0pqZuJgNQgnUo8uONxWNbWhejlca227iq1SqdMEC86D6Lm7ZRDX]pcb4u@e...[/url
> Sent: Saturday, November 25, 2000 8:15 PM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Pulse train
>
>
> I want to pulse an LED and continue to have it pulse while the program
> continues to execute instructions. I see I can create a pulse train but it
> appears that a loop is necessary to create a pule strain. As a result I
> wouldn't be able to process any other data.
>
> My other thought was to set a port high into a stobing led and let the
> hardware do the strobing.
>
> I'd prefer to do it with software..cheaper and I can change the
> duty cycle.
>
> Any ideas?
>
> Jay
>
>
>
>
3 years on single C batery. Great chip for flashing leds. ==Mac== Abilene,
Texas.
At 09:24 PM 11/25/00 -0500, you wrote:
>Actually a 3909 is a better choice for just pulsing a LED. Lower current
>and fewer components...
>Bill
>continues to execute instructions. I see I can create a pulse train but it
>appears that a loop is necessary to create a pule strain. As a result I
>wouldn't be able to process any other data.
> My other thought was to set a port high into a stobing led and let the
>hardware do the strobing.
> I'd prefer to do it with software..cheaper and I can change the duty
cycle.
Hi Jay,
There are certainly ways to do it in software, but with the Stamp it
depends on how often and how accurately you need the pulses. Say for
example that you want the LED to flash for 50 milliseconds, approximately
once a second. Well, that leaves 949 milliseconds between pulses and 50
milliseconds during pulses for the program to do other things. You can do
it all in a loop, but you have to plan ahead. Maybe the program also has
to monitor an input and do something if the input is in a certain state.
May be it is enough to check the input once every 10 milliseconds. The
following runs the loop on a ten millisecond "tick". The flash rate and
length can be changed (in units of 10 milliseconds) by changing a couple of
numbers. It isn't precise--but I don't know what you are trying to
accomplish.
i var byte
LED var out0
output LED
loop:
pause 10 ' 10 millisecond per tick
LED= i max 5 - 5 max 1
i=i+1 // 100
' statements above turns LED on for i=0 to 4
' in a cycle of 100 ticks=1 second
if in1=1 then loop ' check the input
' dosomething quick
goto loop
> Are there any Stamp problems (sinking current) from pin 4 of the 555 when
> the Stamp port is set to 0?
If you use the LMC555, which is the CMOS version of the chip, the pin 4
input will draw practically zero current. The regular '555 should be no
problem either, at a fraction of a milliamp.
good luck!
-- Tracy Allen
http://www.emesystems.com
>3 years on single C batery. Great chip for flashing leds. ==Mac== Abilene,
>Texas.
>
>At 09:24 PM 11/25/00 -0500, you wrote:
>>Actually a 3909 is a better choice for just pulsing a LED. Lower current
>>and fewer components...
>>Bill
>
Greb 'em while you can. I read that they're being discontinued.
(this is stamp 1, modify to suit for stamp 2)
-assuming your led is on pin0
mainloop:w0=w0+1
pin0=bit7
-
- your program here
-
goto mainloop
As register w0 (a word variable) increments, you pick off one of the
16 bits and continually copy it to an output pin. A higher bit
number gives a slower flash rate.
It's not good programming practice, okay in simple programs but can
drive you nuts if there is a lot of branching going on within the
main loop.