Sign Wiring Rainbow Cable Orange: GND Yellow: Teensy 1 Green: Teensy 2 Blue: Teensy 3 Purple: Teensy 4 Gray: Teensy 5 ROYK Cable Red: Teensy 12 Orange: Teensy 11 Yellow: -- Black: VCC Green/Black Cable Green: GND Black: VCC Misc Alligator Clip: GND Teensy pin 0: GND