Mike wrote :

> I first found the blink a led project at the piclist website,
> it was not the one written in jal. The harsh conditions are
> high G-forces and rough landings.

I see, *that* makes a difference. A "real" project, not just
something to "test" a PIC, like the blink-a-LED programs
usualy are...

> I'm currently building a mid sized camera rocket using a
> Kodak F-350 aps camera, it has an electronic shutter.
> I will be using two switches the first will engage very
> shortly after ignition and the second will make momentary
> contact when the chute opens.
> >
> The first switch will start a program where a 1/2 second
> pulse will be triggered every 1.5 seconds for a total of 5
> pulses then when the second switch engages the first
> program is bypassed and a second program...

Now, a PIC can only have one "program", but that program
can be made to do different things at different times. I think
your design will become more easily understood (even by you)
if you don't look at it as using multiple "programs".

> starts a
>1/2 second pulse every 5 seconds for a total of 5 pulses,
> then the chip shuts down regardless of any input.

Since we are talking about a real project, my first
recomendation is to let the F84's rest in peace in some
museum, and use one of the newer PIC's with a good
INTOSC with good precision and that have better timer
resources then the F84 (just one there, right ?)

Maybe a 16F88, 16F818 or 18F1220.
even a F628 would probably do the job better then the F84.
B.t.w, does the F84 have an internal OSC at all ?

Sorry, but this might not have answered you initial
question. But, IMHO, implementing the code you describes
above would be maybe not *much* easier, but at least
easier and, more important, probably different on one of the
newer PIC's then on the F84.

To try to answer your initial question, at least partly, I think that
any "delay" routine would probably be possible to adopt to this
project. I have not searched, but it would surprise me if there isn't
a lot of delay routines on PIClist...


Jan-Erik.

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