In my project I need 3 leds. I would like to use on-board leds if possible.

I know how to use PB0 and PD5 red on-board leds, and I would like to hack the board somehow to use the green power led.

If I do not find a way to use the power led from MCU, I'm planning to destroy it anyway, because it is constantly on, which is harmful in my project.

  • refer to the schematic
    – jsotola
    Commented Jan 31, 2019 at 8:24
  • 1
    The power led is connected directly to the 5V line. So you'd need to modify the board (cut a trace and add a tiny wire).
    – Gerben
    Commented Jan 31, 2019 at 10:22

1 Answer 1


There are 34-pin atmega32u4-based boards. They have 3 leds. So use them instead of pro-micro board.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.