I have just finished making some LED controllers, they have a pretty simple purpose, to turn on and off some RGB LED tape, powered by batteries. There are three trimmers so you can mix the colour you want when you hit the button (on the back of the PCB). The module is long and thin so it can sit alongside the tape in 30mm wide extrusion, and the button can poke through the back.
It has a programmable processor on board so that it can be programmed to do other things, like fade, or change colour… but thats for another day.
They are for Electric Foundry – see www.electricfoundry.co.uk