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I have a 12 pin PMOD interface on my Nandland Goboard FPGA and I would like to turn on an external LED with it.

I can do it on my using pins 5 and 6 which are GND and VCC but I can't figure out how to turn it on using one of the pins controlled by the FPGA. Do I hook the LED to ground and one of the output pins set to logic 1?

Or is it supposed to be output pin logic 1 and VCC? Or some combination?

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Assuming you can control each PMOD signal independently, I would build this circuit:

schematic

simulate this circuit – Schematic created using CircuitLab

This will allow you to power the LED with about 15 mA; my understanding is the max output from the PMOD signals are 8 mA. When the PMOD GPIO is 1, the LED is on, and off otherwise.

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