[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 ...

Want to make one for your desk? All it takes is an Arduino Nano R3 or comparable microcontroller, an RGB LED ring with 12 LEDs, a 16×2 LCD, a buzzer, and a momentary push button switch.