A standard dual altimeter that fire a charge at apogee and a second one 50, 100,150 or 200 meters before reaching the ground.
It also has some standard features such has charges continuity test and beeping the apogee altitude.
This is an Arduino compatible board so you can use the Arduino framework to modify the program and hence customize your altimeter.
You just need to get a USB/TTL adapter (cost only few euros)
and plug it to you PC USB port.
This is very light for a kit using classic components!!!! Board size is: 30mm x 90mm and weight is approximatly 27grams
27/06/2013: I have some new transistors it is even lighter!!!
You can download the kit documentation here.
You can download the code on the download page.