5.0 - Extra Credit!
Put your vast knowledge of Arduino to use and build a new project based on what we did so far. Suggestions:
Build a blinking lights display with multiple LEDs.
Combine blinking LEDs and the light theremin (note: tone() interferes with pin 11 and 3, delay() interferes with pin 5 and 6, so you can end up with odd results).
Use another sensor to set variables for blink or theremin, for example a potentiometer or temperature sensor.