Thank you very much for your useful tips but I also have a basic question to ask you. As I mentioned at the beginning of this post, my goal is to make a wearable biomedical device for monitoring of healthcare. That's why I would like to ask you if you know if I will need anything extra in a component other than the main microcontroller, the sensors and the battery (of course I include all the connections between them). That is, I will need something that will be necessary and may be missed by me at the moment ??