Arduino for STM32

GonzoG I've soldered the headers on another Black Pill board I had lying around and now it actually works. So, I don't know what's going on, but there was definitely something wrong with my first board. Thanks for your help! BTW, I've noticed the readings are actually HIGHER with larger resistors...

@GonzoG: Thanks... Would 1MΩ be too high?

Hi all, I would like to measure the battery voltage of my data logger. I did some research and found that I need a voltage divider. I also learned that if you want to minimize the battery drain you need to use higher rated resistors. I found the blogpost https://jeelabs.org/2013/05/16/measuring-the-...