Comment by radeeyate

Me and a friend of mine are designing a HAB (high altitude balloon) payload meant to go on Hack Club's Apex: https://apex.hackclub.com. It's designed to measure how altitude, temperature, and much more affect photosynthesis, and in turn, chlorophyll fluorescence in algae. We learned a while back that when you shine blue light on chlorophyll, it fluoresces red, and it's really quite a cool phenomena. We're designing custom PCBs for powering and processing data, and even. It'll all go to a Raspberry Pi Zero 2 W which will beam data back to earth over 915Mhz LoRa when it's 100k feet in the sky.