BS2 phase shift, signal delay
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From an external source I have a 12 volt square wave signal (20% duty
cycle at 200Hz).
I would like to input this singal ino a BS2 and ouput the same signal
with a 200 microsecond delay. (Approx. 15% phase shift).
Any suggestions or comments would be appreciated.
cycle at 200Hz).
I would like to input this singal ino a BS2 and ouput the same signal
with a 200 microsecond delay. (Approx. 15% phase shift).
Any suggestions or comments would be appreciated.
Comments
>cycle at 200Hz).
>
>I would like to input this singal ino a BS2 and ouput the same signal
>with a 200 microsecond delay. (Approx. 15% phase shift).
>
>Any suggestions or comments would be appreciated.
Why use a BASIC Stamp? Would a simple delay circuit using a couple
of 555 timers or RC delays work okay? If you need exact control over
the delay, and if the output signal has to be an exact copy of the
input signal, then you will need a much faster micro. The Stamp is
not so good for that, because each single Stamp instruction takes
about 200 microseconds.
That said, you could get near a 200 microsecond delay by having the
stamp delay one instruction:
x var word
loop:
RCtime 0,0,x ' wait for P0 to go high
' will delay about 220 microseconds here
pulsout 1,500 ' output a 1 millisecond pulse on P1
RCtime 0,1,x ' wait for P0 to go low
goto loop
The RCtime instructions above are only used to await a change in pin
state. One millisecond is 20% duty cycle of a 200hz signal.
-- regards,
Tracy Allen
electronically monitored ecosystems
mailto:tracy@e...
http://www.emesystems.com
you'd get with this:
OUTPUT 1
loop:
out1=in0
goto loop
There would be some delay but I don't know how much or how repeatable.
Al Williams
AWC
* Floating point A/D
http://www.al-williams.com/awce/pak9.htm
>
Original Message
> From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=cl3JeeUWtTEBmRFx7GyDhuiv3YrzMbhCZy-jVfP9r6bSftQn-OUz1AQjxNwV_xkFDwcYUsJ7qB3it3om]tracy@e...[/url
> Sent: Friday, August 31, 2001 11:07 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] BS2 phase shift, signal delay
>
>
> > >From an external source I have a 12 volt square wave signal (20% duty
> >cycle at 200Hz).
> >
> >I would like to input this singal ino a BS2 and ouput the same signal
> >with a 200 microsecond delay. (Approx. 15% phase shift).
> >
> >Any suggestions or comments would be appreciated.
>
> Why use a BASIC Stamp? Would a simple delay circuit using a couple
> of 555 timers or RC delays work okay? If you need exact control over
> the delay, and if the output signal has to be an exact copy of the
> input signal, then you will need a much faster micro. The Stamp is
> not so good for that, because each single Stamp instruction takes
> about 200 microseconds.
>
> That said, you could get near a 200 microsecond delay by having the
> stamp delay one instruction:
>
> x var word
> loop:
> RCtime 0,0,x ' wait for P0 to go high
> ' will delay about 220 microseconds here
> pulsout 1,500 ' output a 1 millisecond pulse on P1
> RCtime 0,1,x ' wait for P0 to go low
> goto loop
>
> The RCtime instructions above are only used to await a change in pin
> state. One millisecond is 20% duty cycle of a 200hz signal.
>
> -- regards,
> Tracy Allen
> electronically monitored ecosystems
> mailto:tracy@e...
> http://www.emesystems.com
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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> Subject and Body of the message will be ignored.
>
>
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>
act on the logical result? Still sounds like a dual oneshot and a couple of
AND gates would work better and cheaper.
Mike
At 03:31 PM 8/31/2001 +0000, you wrote:
> >From an external source I have a 12 volt square wave signal (20% duty
>cycle at 200Hz).
>
>I would like to input this singal ino a BS2 and ouput the same signal
>with a 200 microsecond delay. (Approx. 15% phase shift).
>
>Any suggestions or comments would be appreciated.
>
>
>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/
_________________________________
Mike Walsh
walsh@i...
a thing?
Leroy
dynamictech@v... wrote:
>
> >From an external source I have a 12 volt square wave signal (20% duty
> cycle at 200Hz).
>
> I would like to input this singal ino a BS2 and ouput the same signal
> with a 200 microsecond delay. (Approx. 15% phase shift).
>
> Any suggestions or comments would be appreciated.
>
> 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/
>you'd get with this:
>
>OUTPUT 1
>loop:
> out1=in0
> goto loop
>
>There would be some delay but I don't know how much or how repeatable.
>
>Al Williams
>AWC
>* Floating point A/D
>http://www.al-williams.com/awce/pak9.htm
From data at
http://www.emesystems.com/BS2speed.htm#timetables
out1 or in0 would each require about 140 microseconds, and the "goto
loop" would take about 250 microseconds. So, depending where pulse
occurred in relation to the execution of the loop, the delay could
vary from 140 to 530 microseconds. It would fall into some
phase-locked pattern that could be "tuned" by adding instructions.
The snippet I posted using RCtime would be poised to respond
immediately to the leading edge of the pulse. Everything is faster
on a BS2SX or BS2P, with enough time to insert an "adjustment"
instruction.
' for BS2SX
x var word
loop:
RCtime 0,0,x ' wait for P0 to go high, and
' will delay about 90 microseconds here
pulsout 2,25 ' this adds another 110 microseconds
' with a dummy pulse on P2 (adjustable!)
pulsout 1,1250 ' output a 1 millisecond pulse on P1
' when this pulse finishes
' P0 will probably already be low
' but just to be sure, we do the following:
RCtime 0,1,x ' wait for P0 to go low
goto loop
Alternatively, the BS2P has the "interrupt" capability, that causes
an output to change in response to an input without program
intervention. But I think the latency would depend on what the
program is doing--The "interupt" response only happens between
instructions.
-- best regards
Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
mailto:tracy@e...
>
>>
Original Message
>> From: Tracy Allen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=guxmTvy9eqGvaa0TLFOk1nMUCsmxEmxfcz8-fnYp-73xi6TiaE6P6sGeFPqz8SveQahIrU9U5wIA5NK0sg]tracy@e...[/url
>> Sent: Friday, August 31, 2001 11:07 AM
>> To: basicstamps@yahoogroups.com
>> Subject: Re: [noparse][[/noparse]basicstamps] BS2 phase shift, signal delay
>>
>>
>> > >From an external source I have a 12 volt square wave signal (20% duty
>> >cycle at 200Hz).
>> >
>> >I would like to input this singal ino a BS2 and ouput the same signal
>> >with a 200 microsecond delay. (Approx. 15% phase shift).
>> >
>> >Any suggestions or comments would be appreciated.
>>
>> Why use a BASIC Stamp? Would a simple delay circuit using a couple
>> of 555 timers or RC delays work okay? If you need exact control over
>> the delay, and if the output signal has to be an exact copy of the
>> input signal, then you will need a much faster micro. The Stamp is
>> not so good for that, because each single Stamp instruction takes
>> about 200 microseconds.
>>
>> That said, you could get near a 200 microsecond delay by having the
>> stamp delay one instruction:
>>
>
> > x var word
>> loop:
>> RCtime 0,0,x ' wait for P0 to go high
>> ' will delay about 220 microseconds here
>> pulsout 1,500 ' output a 1 millisecond pulse on P1
>> RCtime 0,1,x ' wait for P0 to go low
>> goto loop
> >
>> The RCtime instructions above are only used to await a change in pin
>> state. One millisecond is 20% duty cycle of a 200hz signal.
>>
>> -- regards,
>> Tracy Allen
>> electronically monitored ecosystems
>> mailto:tracy@e...
> > http://www.emesystems.com
>>
>>
>> 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/
>>
>
>
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>Subject and Body of the message will be ignored.
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