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troubleshooting.md

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Troubleshooting

The head servo is overheating

This may be because you left the servo head connected to Pin 13. Please make sure you moved it to Pin 6 as explained in Modify some wiring.

Pin 13 is used to control the built-in LED of the Arduino board. The petitcat arduino code sends a fast on/off signal to Pin 13 to make the LED blink quickly to indicate that the robot is waiting for a wifi command. If Pin 13 is connected to the head servo, the servo won't move but will overheat.

The robot moves backward

In some versions of the Osoyoo robot, the wheel wiring is backward. You may invert the wheel wiring or set negative coefficients to wheels in robot_define.h like this:

#define REAR_RIGHT_WHEEL_COEF -1
#define REAR_LEFT_WHEEL_COEF -1
#define FRONT_RIGHT_WHEEL_COEF -1
#define FRONT_LEFT_WHEEL_COEF -1

Bad detection of objects by the HC-SR04 ultrasonic module

Bad reception of echo signals may result in:

  • PetitCat often fails to detect object.
  • The outcome packet often misses the "echo_distance" field.
  • After a "Scan" interaction, the "echos" field of the outcome packet contains no or few values.

This may be caused by a poor electrical connection of the HC-SR04 ultrasonic module. Please check and tighten its wiring according to the diagram in Osoyoo Lesson 2.