be80be:
I would use the ardunio to take pictures. I made a 3 stage 38 years ago made the paper Kansas city Kansan front page even first 12 year old to make a 3 stage it fired all of them. And i lost it so I would of like to had tracking.I fired mine with the car battery
Here this may help you http://www.apogeerockets.com/education/downloads/newsletter91.pdf
thanks i didnt cosidered to use a dedicated timer or altimeter the thing of arduino is that you can program it to make a lot of stuff and its light but im ordering a timer from perfectflite.com to test on a smaller rocket before mounting the big one