I have a MKR Wifi 1010 board. I am trying to figure out the right value of a resistor as a current limiter for a typical 2V red LED that can draw a maximum of 20mA. I did some testing and without a current limiting resister, it seems the MKR Wifi 1010 will only let 7mA flow. I see a note in the fu…

When I first aquired my mkr wifi1010 I ran across this post discussing the "drive strength" of the pins on the samD boards. Apparently there is a bit in a register that sets the drive strength of the pins to be either 7mA or ~ 2.5mA depending on whether it is set or not. By default it is set to th…

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

Official Hardware MKR Family MKR WiFi 1010

rletulle September 8, 2021, 1:30am 7

@LarryD Thank you, this is very helpful.

I got 1.94V over the LED and 0.54V over the 220ohm resistor.

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

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