It should be bridged for 5V Pro Micro. Without the solder bridge cheap Pro Micro spit out only 4.6V instead of 5V at both VCC and RAW pin in my test. This is due to forward voltage drop of protection ...
Apart from understanding the Arduino's code language, one of the most confusing parts about the platform — especially for beginners — is picking the right board to use in a project. Sure, it isn't ...