Step 2: Assemble your circuit!
-- The ground wire will attach to the ground pin on the Arduino. The other three wires must be attached to pins labeled PWM on the Arduino. In our case those will be pins 9, 10, and 11.
-- Attach the battery to the top of the Arduino.
-- Tie string to the three holes on the Arduino board and tie them in the center above the board so that it hangs parallel to the ground.