The photo above shows the radio receiver for radio control inside it's transparent fuse box dome in a half built state. The contstruction is quite fiddly and consists of 2 pentagon shaped PCBs, the top one being used to starp the reciever module down onto and the lower for some signal LEDs.

The lower PCB has 4 LED channels as below, red, green, blue and yellow. The four LED clusters are powered by 12 volts via the L293D chip. The chip itself requires 12V for the LED power, 5V for the logic power and can be activated with 3.3V output from the MCU.

Finished assembly: