29.) Connect the roof lights to the rest of the circuit by rst placing the
main roof section on top of the building and connecting the 15cm cable
cable from 12-port expansion board to the left port on lightstrip#2.
Then connect the 2 cables from the billboard lights into the expansion
board.
Connect the 30cm cable from the right side of the building (which we
left 3cm free) to the right port on striplight#3.