We have been kicking around the idea of using a small turbine to capture wind and the kinetic energy of the balloon to recharge a battery pack (batteries or phone charger??) that could be used to power some PiCameras. In the past we have used Lithium Pro batteries + LM2596 with great success, but the idea of capturing, transforming and storing the otherwise wasted energy is intriguing. Even if we don't use it to actually power anything on the first attempt, but rather use this launch as a performance check.
There are examples of DIY wind turbine phone chargers online, but I am wondering if anyone has advice on the most effective circuit as well as components that will be able to handle the extreme conditions.
We may consider doing a comparative analysis between wind and solar (depending on the mass of components required). Is there anyone who has tried this with solar?