Issue Description

Possible Causes

1.  If running a self-created program, the program may be incorrect.
2.  If the preset automatic obstacle avoidance mode cannot be run, maybe the firmware has not been restored to the factory firmware, or it has been switched to another preset mode.
3.  Installation error such as wrong wiring of ultrasonic module.
4.  The ultrasonic sensor is faulty, resulting in the inability to recognize the obstacles ahead.

Troubleshooting Steps

1.  If you created an obstacle avoidance program by self, please send us the complete program file for checking and testing.

2.  If you are running the product's built-in automatic obstacle avoidance mode, you need to confirm that the product is in the factory firmware and has switched to the correct mode (LED light is green). You can also switch to the other preset modes to confirm whether the function is normal. Here is a guide on how to use preset modes: Use the Preset Modes of mBot

3.  By default, the ultrasonic module needs to be connected to port 3 of the mCore.

4.  If other preset modes are normal, please test whether the ultrasonic sensor is faulty as follows:

• Connect the mBot to the computer via USB and turn on the power switch of it.
• Switch to Live mode and select the corresponding ultrasonic sensor block in the "Sensing" section (make sure the actual interface of the sensor matches the block setting). Then move your hand back and forth in front of the ultrasonic module to see whether the distance reading in the upper left corner of the mBlock page changes normally.

• If the sensor readings remain at 0 or 400 constantly, the module may be faulty and need to be replaced.

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