This is a fairly simple project, so I don't think you'll have too much
trouble.

First, check the following site:
http://www.voti.nl/swp/index.html

The gentleman who authored it frequents the mailing list.

Second, get the blinking circuit to work!

Third, here's my approach:

Use a 12F675 (since you have them).  Run it with a 32.762 kHz crystal,
since many are built to be sturdy and that's important.

Use busy loops to wait the appropriate number of cycles (.5 sec is 4096
cycles).  Ta-dah!  Accurate to 20 ppm, and probably costs less that $2.

If you need less accuracy, you can do it using the internal oscillator...

Mike H.

>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 starts a
>1/2 second pulse every 5 seconds for a total of 5 pulses, then the chip
>shuts down regardless of any input.
>
>I'm very new with programming and have only programmed one pic with the
>blink program and it didnt work once put in the circuit, I have a few
>pic16F84A and have some 12F675 comming in soon. I have quite a bit of
>electronic knowledge, but programming is greek to me.
>
>Anything that would help would be great
>Mike
>
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