[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a ... This time around it’s an Arduino doing the measuring instead of a PIC. So why isn’t that sensor shown in this ...

then swapped out the LED itself for an RGB version (same wattage) using the same heat sink and case. More often that not we see this type of system controlling Christmas lights. [Shelby] mentions ...