Max Current for Digital Pins: Is it limited by the board?

Official Hardware MKR Family MKR WiFi 1010
8

1.94v confirms the 2v for a red LED.

1.94v + .54 = 2.48v

3.3v - 2.48 = .82v across the output MOSET in the controller, seems high.

.54V ÷ 220 Ω = 2mA thru the LED :frowning:

Try a different output, one that never had a LED without a series resistor during your experimenting.

Which way are you wiring the LED, as D5 or D6 in the image below (UNO is shown, ignore this fact) ?

Double check that your 3.3V is indeed 3.3V. :thinking: