• computer, Windows or Mac
• Arduino software; download from https://www.arduino.cc/en/software
• Arduino Inventor’s Kit (recommended), at SparkFun; includes the following necessary components: Arduino UNO microcontroller and programming cable, NPN transistor, diode, breadboard, jumper wires, electric motor, 330-ohm resistor, and more
• 9V battery
• 9V connector wire
• sticky notes
• push pins
• hot glue gun and hot glue sticks

For advanced challenges:

• temperature sensors
• photocells
• knob or soft potentiometers
• motor driver shield, such as the Ardumoto motor driver shield from SparkFun and header pins, such as the Arduino stackable header kit from SparkFun
• H-bridge, such as the H-bridge motor driver 1A from SparkFun