Figure 1-8 The motors and battery box glued
to the inside of the box
The motors and battery box are fixed to the bottom of the case, at either end, leaving room for the
Arduino and shield in the middle.
Step 5. Cut the Case Bottom and Fix the Castor
Figure 1-9
shows how the case bottom is cut to allow the top of the gear motors and their drive shafts to
protrude from the bottom of the case.
Figure 1-9 The case bottom
It is also a good idea to make a hole close to the Bluetooth module so you can see if the LED on the
module is flashing or solid. The box used by the author was reused from
a previous project and had
various holes in it. This is not a bad thing as it allows ventilation.
The castor is merely the smallest castor the author could find at the local hardware store. This is just
glued to the bottom part of the case.
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Step 6. Final Wiring
The wiring is made easy by the screw terminals.
Figure 1-10
shows the wiring diagram, while
Figure 1-
11
displays a photo of the inside of the robot.
Figure 1-10 The wiring diagram
Figure 1-11 Inside the robot
The wiring steps are:
1. Solder leads from each of the tabs on the gear motors. The leads should be long enough to comfortably
reach the screw terminals on the motor shield.
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