This page is kept for historical interest. It may document projects or methods that are obsolete and/or no longer relevant. The information here is not kept up-to-date.
I used this module to control the LED lights in my first apartment.
Mounted in the living room
A build-in voltage regulator for 5V allows a input voltage of 9 to 24V. The used is used for digital control of four channels, every channel with a dual color LED (red/green) and a push button. The LEDs show the status of the output, they lit up when a button is pushed and turns off after 10 seconds. By pushing the buttons the outputs can be toggled. The module can receive a external signal that turns off all outputs. Max load is 0.5 A (about 25 LEDs). It's possible to power anything running on 5V with this controller, like relays.