The best known interface is USB. I show in this article, how to connect and catch data from STM32 bluepill board in 15 minutes.
In this part I added block schematic and electric schematics
If you have issue with flashing BluePill I have for you 2 solutions.
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This project can show how strong is electromagnetic field in your place. In Polish norms and documents I saw that the maximum power from GSM Base Telecomunication Stations is 2 Watts EIRP. In first part of article I will show you fundamentals about this electronics project.