I have a pair of boards that I dug out of storage and was going to start coding for a series of lights, but I cant get a singular LED to turn on, same code, both boards. I have a standard blink uploaded to both. [image] on the mega2560 the blink works fine, I can see it through the L light, but a…

Thank you but the problem is not the code Try using a different pin to drive the external LED but you must use a current limiting resistor

Neither of my boards seem to be working but I cannot identify why

maxgerhardt October 18, 2025, 8:28pm 8

Nice, killed the LED and the IO pin by not using a current limiting resistor, double kill.

1 Like

Topic		Replies	Views
help with my Mega2560! IDE 1.x	5	1693	May 5, 2021
Arduino Mega Blinking LED problem IDE 1.x	5	2329	May 5, 2021
Mega 2560 > Me. IDE 1.x	12	3116	May 5, 2021
Upload doesen't work: Arduino Mega 2560 IDE 1.x	4	1476	May 5, 2021
L LED on AT MEGA 2560 Blinking alot IDE 1.x	2	7727	May 5, 2021