Ball Wacker with littleBits

You too can wack a foil ball or a dark balloon with a servo and a light sensor.

1. Assemble the littleBits circuit: power + wire + wire + light sensor + servo.
2. Attach the circuit to a lightweight stick like a chop stick or a bubble wand. The light sensor should be affixed to the end of the bubble wand so that it is facing the light. The servo should be oriented so that when the stick moves, the front of the light sensor is hitting the ball.
3. Tape wires to the stick, leaving slack at the base to allow for movement.
4. Set servo to turn mode and light sensor for dark mode. Adjust sensitivity so that with one light source your sensor can detect the shadow cast by either a dark balloon or a foil ball.
5. Hold the black rectangular portion of the servo with one hand and dangle a foil ball tied to a 2 foot string with the other hand. The servo should show some movement.
6. Hot glue a 9 volt battery clip or maybe an extra large binder clip to a block of wood so that the servo and stick have free range of movement when the servo is clipped into place.