Pulse measurement sans Stamp

Archiver

OK, the Stamp can do a good job measuring pulses with PULSIN, but are
there alternatives out there when I don't want to dedicate a stamp to
a function?
I want to set up a few functions to work of an RC receiver's PWM
servo signal, which normally varies from 1.0 - 2.0 or so ms, repeated
every 20 ms. So a device (or cascade of devices) would close a switch
if the pulse is in one range, another switch if in another range.
(And I don't want to just buy one of those multifunction devices that
are on the market).
Thx, PM

Archiver

One way to do that would be to write the program for the basic stamp and
after it works the way you want it use a Basic compiler and program a
PIC. A PIC16F872 is a 28 pin package with 22 I/O pins and can be bought
for about $3.50 plus you need a crystal if you need someone to compile
your program and write a PIC let me know.

Craig


> Message: 18
> Date: Sun, 06 May 2001 01:26:42 -0000
> From: patmat2350@a...
> Subject: Pulse measurement sans Stamp
>
> OK, the Stamp can do a good job measuring pulses with PULSIN, but are
> there alternatives out there when I don't want to dedicate a stamp to
> a function?
> I want to set up a few functions to work of an RC receiver's PWM
> servo signal, which normally varies from 1.0 - 2.0 or so ms, repeated
> every 20 ms. So a device (or cascade of devices) would close a switch
> if the pulse is in one range, another switch if in another range.
> (And I don't want to just buy one of those multifunction devices that
> are on the market).
> Thx, PM
>

Archiver

Hmmm, would work, but how do they measure pulses in a typical servo?
I'm thinking there must be a simple analog/dicrete solution here...
like, maybe they convert pulse width to voltage level (= desired
position), and compare to current position (via voltage across the
position pot) with an op-amp?
The key then is conversion of pw to voltage.
Any help, anyone?
patmat

--- In basicstamps@y..., Craig Gardner <cgardner@r...> wrote:
> One way to do that would be to write the program for the basic
stamp and
> after it works the way you want it use a Basic compiler and program
a
> PIC. A PIC16F872 is a 28 pin package with 22 I/O pins and can be
bought
> for about $3.50 plus you need a crystal if you need someone to
compile
> your program and write a PIC let me know.
>
> Craig
>
>
> > Message: 18
> > Date: Sun, 06 May 2001 01:26:42 -0000
> > From: patmat2350@a...
> > Subject: Pulse measurement sans Stamp
> >
> > OK, the Stamp can do a good job measuring pulses with PULSIN, but
are
> > there alternatives out there when I don't want to dedicate a
stamp to
> > a function?
> > I want to set up a few functions to work of an RC receiver's PWM
> > servo signal, which normally varies from 1.0 - 2.0 or so ms,
repeated
> > every 20 ms. So a device (or cascade of devices) would close a
switch
> > if the pulse is in one range, another switch if in another range.
> > (And I don't want to just buy one of those multifunction devices
that
> > are on the market).
> > Thx, PM
> >