Has anybody else had this problem. I was using the fade program to test a single LED. I hooked up the led from pin 9 though ground and nothing happens. When the resistor is moved to the 5 volt it works. Any idea on why this seems to be active low. I have tried two different boards same result. Pleas…

Arduino uno strange happenings

Koepel October 25, 2021, 1:27am 2

The LED has a positive and negative side.

Topic		Replies	Views
Need some help!! IDE 1.x	4	1396	May 5, 2021
Slow processing? Troubleshooting	11	3324	May 6, 2021
[solved] arduino uno broken IDE 1.x	26	3825	May 5, 2021
LED won't turn on in Arduino Uno IDE 1.x	2	3504	May 5, 2021
ard. uno output pins problem, 5 to 9, 10 is ok. IDE 1.x	11	10459	May 5, 2021