I am wondering what external hardware it would take to send my raspberry pi into the stratosphere like the two people from Britain who sent theirs up in a weather balloon. I would like to know, how I would do it, what software & external hardware I would need and I would like to know how I could take the photos wirelessly(obviously) and get them sent in real time(possibly) back to my main PC or a cloud server.
Neither GSM nor WiFi will work at weather-balloon altitudes.
If you have a ham radio licence and live in a country (such as the USA, but not the UK) where airborne ham transmitters are allowed, then APRS is a good solution.
Elsewhere, low-power ISM FM transmitters are the best solution.
Have a read of www.ukhas.org.uk
I'd say that you need temperature sensor or whatsoever connected to the GPIO pins. And I suggest that you start learning Python for a easy way to talk to the GPIO. So you can control them through Python. It's not that difficult to read and write codes for it to give you the data you need.
ModMyPi has also good tutorials that you can read. https://www.modmypi.com/blog/ds18b20-one-wire-digital-temperature-sensor-and-the-raspberry-pi
Two ways I'd make my stuffs wireless.
- Using the GSM.
- WiFi connection that has bigger antennas.
I hope this answer have been useful in any way for you!