Powering the LED from Raspberry Pi GPIO

The Sangaboard v4 provides an output to drive an LED, this uses a Darlington pair driver to allow it to be switched. If a Sangaboard v4 is not available, you can also power the LED by wiring the LED-and-resistor assembly, or the illumination PCB, directly to ground and 5v on the Raspberry Pi GPIO pins. The correct pins to use are shown in the image below.

Warning: you must use a resistor in series with the LED to avoid drawing too much current, as described in the illumination instructions. (why?) This may damage your Raspberry Pi if done incorrectly.

Connecting the LED to Raspberry Pi GPIO