Hi Ali G., I noticed your profile and would like to offer you my project. We can discuss any details over chat.
Hi I am a hobbyist photographer from Australia looking to build a look range controllable retrievable weather balloon.
I want to see if the balloon can travel across the world and be able to drop where required to be retrieved with equipment..
This would include GPS monitoring and maybe a valve to control pressure to stay stabilised and a release valve when it has to drop..
Can you let me know your thoughts on this project and if it is something you have experience with.
I don't need detail circuit design, I just need to know what would be needed to build this..
Then later the next stage would be a more detailed design.
Thanks for your time