Hello Forum,
I am using an Arduino Pro MIni 3.3V module. I accidentally used a Sparkfun FTDI Basic Breakout with the rear solder jumper soldered to the 5V side.
The Pro Mini did not seem to be running my code properly and then I realized that I had the jumper soldered to the wrong side.
I removed the 5V jumper and changed it to the 3.3V jumper. My code is still not running properly.
Did I damage the microcontroller when it was previously connected to the 5V side?
TIA
–Neal
Hi Neal.
The extra voltage won’t affect the microcontroller on your Pro Mini, but it could potentially affect any 3.3 volt parts you may have attached too it. Double check your code, there could be an issue with the code that’s causing problems rather than a hardware problem. (Assuming you don’t have damaged 3.3 volt parts connected to the Pro Mini anyway.)
You might also try uploading some known good code like the ‘Blink’ example as a test to see if the board is functional.