I'm using Parallax's Basic Stamp BS-IC-2. It is extremely easy and quick to program. Here's a fast run down of the design. The DC20 will sit in a plywood carrier that will fit into the payload section of the rocket. The camera controller, the Basic Stamp, will also handle the dual deploy to eject the camera package and chute out of the payload section. The delay timer is programmed by pressing the delay button the required number of seconds. Fifteen seconds of delay will require fifteen presses of the button. The delay LED will flash fifteen times to indicate the number of seconds programmed into the controller. I will have the controller roll over to five seconds if more than 20 or so presses are recorded. A similar scheme will be done for the number of pictures feature.
The gee switch will start the clock. This is simply a micro switch with a small weight attached to the arm. A safe switch prevents accidental ejections (hopefully). The MAX232 chip changes the Stamp signals to true RS232 voltages.
If time allows, this project will be fully debugged and flight worthy by January, 1998. Check back here for the Basic code and schematics.
NOTE: I, personally, am rather reluctant to launch expensive payloads to 10,000 feet only to have it impact the earth at 100 plus gees. I may adapt Plywood Cam's servo and cheap camera tactics to serve my needs. The Basic Stamp can do both equally well.