This guide was first published on Dec 06, 2013. It was last
updated on Dec 06, 2013.
This page (Adding LEDs) was last updated on Jun 24, 2019.
The Trellis PCB comes with all the driver circuitry but doesn't come with LEDs installed! This is because we know people want to get creative with the LED colors - choose any color you like! Diffused 3mm LEDs with 250mcd+ brightness look best.
As you can see here, the LEDs sit inside the button cavity and the two button contacts surround it. This allows for the nice frosted LED effect.
The LEDs are seperately controlled from the buttons - an Arduino or similar is required to read data from the buttons and then write out what LEDs to light up.
LEDs have polarity so they have to be installed the right way or they won't work! There's a little + symbol on the left hand LED pads, thats the anode/positive pin. LEDs have a longer leg on the + pin so make sure that pin goes into the + hole.