Datasheet

Chapter 3 • Assemble and Test your BOE Shield-Bot
88 • Robotics with the BOE Shield-Bot
 If the left wheel/servo does behave properly, then your BOE Shield-Bot is
functioning properly. You are ready to move on to Activity 3: Start-Reset
Indicator on page 89.
Servo Troubleshooting
The servo doesn’t turn at all.
 Make sure the battery pack has fresh batteries, all oriented properly in the case.
 Make sure the BOE Shield’s power switch is set to position-2. Then re-run the
program by pressing and releasing the board’s RESET button.
 Double-check your servo connections. You may have inserted the plug over the
pins backward, or offset it so it is only catching on one or two pins.
 Double-check your sketch against RightServoTest for the right servo, and double-
check the modifications for the left servo.
The left servo turns when the right one is supposed to.
 Disconnect power—both battery pack and programming cable.
 Unplug both servos.
 Connect the servo that was connected to pin 12 to pin 13.
 Connect the other servo (that was connected to pin 13) to pin 12.
 Reconnect power, re-run the RightServoTest sketch to test the right servo, and
then modify it to test the left servo.
The wheel does not fully stop; it still turns slowly.
 Try adjusting in hardware: Go back and re-do Chapter 2, Activity 5: Centering the
Servos on page 63. If the servos are not mounted to give easy access to the
potentiometer ports, use a long-shaft screwdriver or consider re-orienting them
for re-assembly.
 Try adjusting in software: If the wheel turns slowly counterclockwise, use a value
that’s a little smaller than 1500. If it’s turning clockwise, use a value that’s a little
larger than 1500. This new value will be used in place of 1500 for
all
writeMicroseconds calls for that wheel as you do the experiments in this
book.
The wheel never stops, it just keeps turning rapidly.
 Try adjusting in hardware: Go back and re-do Chapter 2, Activity 5: Centering the
Servos on page 63. If the servos are not mounted to give easy access to the
potentiometer ports, use a long-shaft screwdriver or consider re-orienting them
for re-assembly.
 If the servo speed and direction never varies while trying to center it, it may be
damaged. Contact [e-mail] for help.