Arduino Inventor’s Guide CIRC-03 (Transistor and Motor)

The third circuit in the Arduino Inventor’s Guide uses current flowing through a P2N222AG transistor to spin a motor.

Arduino CIRC-03

Arduino CIRC-03


  • 1 x Arduino Duemilanove
  • 1 x Breadboard
  • 1 x P2N2222AG transistor
  • 1 x Toy Motor
  • 1 x 1N4001 Diode
  • 1 x 10k Ohm Resistor (Brown-Black-Orange)
  • 6 x wire

Additional Resources:


Despite the fact that this is a simple circuit to build, I just haven’t been able to get it to work. It has been rebuilt several times, using different wires, 10k Ohm resistor and a different P2N222AG transistor. I suspect I might have a defective diode or faulty wiring for the motor. I am unable to verify this as I only have one of each. Hopefully others are able to have more success with this circuit than I did. I will update this post if I finally get it working.

Author: Aaron Ferguson

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