# Controlling RGB LED on the Expansion Dock

Last edited by Boken Lin, 2015-11-28 02:58:46

The Expansion Dock has an LED that is controlled by three GPIO pins:

• Pin 17 for the Red LED
• Pin 16 for the Green LED
• Pin 15 for the Blue LED

## Using the Console:

The console is under development and is coming soon! Stay tuned!

## Using the Command Line:

You can use the expled tool to specify the colour of the LED. It will use software PWM to drive the three LEDs.

Usage:

expled <6 digit hex value>

Where the first two digits represent the Red value, the next two represent the Green value, and the last two represent the blue value.

Example:

expled 0xf21133

This will set the Red to 0xf2, the Green to 0x11, and the Blue to 0x33.

The LED should now be pink-ish.