747flyer wrote:Me and have friend have had an idea for several months:Launch a Pi as close to space as we can. Solid rocket booster, though they would get us higher, post several threats and cost issues. We have decided upon several helium filled balloons lifting a Pi and several sensors and cameras up to about 20 miles, where we will remotely release the balloon and activate parachutes. However, to know when to release the balloons and parachute, we would need to actively view the altimeter, barometer, and others from the ground. Does anyone know how I could set up a radio link between the two, for transmitting of camera footage from the Pi, to the laptop, and send commands back up over 20 miles.
First thing, keep it simple. Use one balloon not several - you can get weather balloons plenty big enough to carry any reasonable payload (and I strongly suggest nothing more than 1kg total). Don't release the balloon - it'll burst anyway. Don't (10 times over) activate the parachute - use an inline chute so there is zero chance of it not deploying. Don't bother with commands - you'll need an amateur radio licence for a start, and you'll need to make sure that the transmission from the balloon doesn't drown out the feeble signal it sees from your ground transmitter.
Next, and best, bit of advice: go to www.ukhas.org.uk
and read it. All of it, pretty much