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7. Drill holes in the transmitter box for the LED and switches.
   Figure 11-14 shows holes drilled in the front of the box for the LED and in
   the top of the box for the switches. The size of drill bit that you use
   depends upon the diameter of the switches and LED socket you use. We
   used a^1 ⁄ 4 " drill bit to drill the hole for the LED and a^5 ⁄ 16 " drill bit to drill
   the holes for the switches.

Pin 7 of IC1 encoder to on/off terminal block Resistor to LED terminal block

Pin 4 of IC1 encoder to motor L terminal block Pin 6 of IC1 encoder to motor R terminal block

Figure 11-13:

Connect

terminal

blocks to

the IC1

encoder

and resistor.

254 Part III: Let There Be Light