How about one light sensor and two touch sensors?


Rolling off onto the black or a black finger works.

Now how to do Mary Had a Little Lamb?
Write the notes.  Change to code. Figure which touch sensor to touch and when to roll.

middle first nothing first middle middle middle first first first middle off off
middle first nothing first middle middle middle first first middle first nothing
Otherwise known as Mary Had a Little Lamb
St. Joseph FIRST LEGO League after school