Page 26 - Build a Remote Controlled Robot

FIGURE I-15. Basic wireless remote control system. INTRODUCTION xxv

other two batteries are both 9 volts. One powers the receiver
used in the remote control system, while the other is used to
power the robot’s blinking-light bow tie.
The 6-volt batteries came from a motorized children’s ride-on
toy. They have the advantages of being readily available and
being designed to be safe, because they are sealed. Another
advantage is that the battery charger and plug needed come with
the batteries (Fig. I-17). Currently you can find these batteries
in both 6- and 12-volt sizes. The first of the 9-volt batteries came
with the remote control system along with a charger for both
the receiver and the transmitter. The second 9-volt battery, for the
blinking bow tie, is simply a standard rechargeable. Figure I-18
shows the two 9-volt batteries. You will notice that while they are
both 9 volts they are different sizes.
By using separate batteries for each system you can avoid
having to build the complex circuits needed to raise or lower