Hi Manuel,

You should check the nuts & volts website as a model rocket launcher was a PIC project I believe early in 2006.

I was looking into building a couple for my grandsons that was fully automatic with an ISD chip providing the countdown over a loud speaker adding the various system checks. I thought of using a relay to prevent accidental ignition. Have it wired normally open until a specific point in the countdown then if the other safety checks were okay then the relay would be switched on enabling launch voltage ready for the count to reach zero.

I was heavy into rocketry as a kid myself! Have fun.

BobK