FAQs on mBot Ranger

Q1: How to turn the robot on?

Press the red button on the top of the main control board.



Q2: How to turn the robot off?

Press and hold the red button on the top of the main control board.



Q3: Why did the robot not work after I turned it on?

There may be two possible causes:

  • The batteries ran too low to power the robot. Replace the batteries with new ones.

  • The connection cables of the motors may be damaged. Replace the connection cables with new ones.

Q4: I try to turn the robot to the left but it turn to the right.

You may have connected the two motors to the wrong ports. Swap the ports of the two motors.



Q5: There were noises after I got the robot tank running.

  • Check the installation of the driving and driven wheels. Make sure that they are properly fitted.
  • Grease the bearings of the driven wheels.



Q6: The Nervous Bird couldn't work properly.

There may be two possible causes:

  • The batteries ran too low to power the robot. Replace the batteries with new ones.

  • The robot wasn't properly built. Make sure that all the wheels are properly fitted and no obstacle affects its movement.

See Playing mBot Ranger with the Makeblock App to learn how to control Nervous Bird.


Q7: I can’t connect the Makeblock app with the robot via Bluetooth.

  • Make sure that the Bluetooth on your smart device works properly.
  • Try restarting the app or resetting the main control board.
  • Tap the search icon to search for devices manually.
  • The batteries may run low. Try replacing the batteries with new ones.


Q8. I want to know whether the main control board is powered by USB 5V or a power supply of 6–12V.


When it is powered by USB 5V, the USB indicator is lit up in red. When it is powered by a power supply of 6–12 V, the power indicator is lit up in green. When both indicators are lit up, the power supply of 6–12 V is used.



Q9: Why do the M4 nuts keep coming loose?

The M4 nuts will come loose if you run the robot for a long time. Use the wrench and screwdriver to tighten them.


Q10: Why can't I read the values of the ultrasonic sensor and line follower sensor?

Check the wiring of the sensors. Make sure that they are connected to the correct ports as described in the user manual or programs.


Q11: Why did the light sensor show a high value in a dark area?

Check whether the RGB LED is turned on. If yes, it may affect the sensing of the light sensor.



Q12: Why can't the line follower sensor detect black lines?

  • The line follower sensor is affected by the sunlight. Do not placr the sensor under the sun.
  • The distance between the the sensor and the line exceeds the detection range, which is 1 to 2 cm. Make sure that the black line is within the detection range.


Q13: How do I know when it's time to replace the batteries?

Replace the batteries when: 

  • Land Raider and Dashing Raptor move very slowly and even automatically restart while turning or bumping into things.
  • Land Raider and Dashing Raptor don’t move when you set the motor speed to the full power.


Q14: How do I replace the batteries conveniently?

Method 1: Install the battery case using the M3 nut and M3*8 screws in the accessories bags.

You can quickly remove the battery box within 10 seconds. Please watch the video tutorial.

Method 2: Disassemble four nuts to replace the battery. Refer to the picture below.

①Land raider  


②Dashing raptor


③Nervous bird



Q15: How do I update mBot Ranger?

You can restore the factory settings of mBot Ranger by restoring its firmware on mBlock 5.

1. After connecting mBot Ranger to mBlock 5, click Setting. For details about how to connect mBot Ranger, see Programming mBot Ranger with mBlock 5.


2. Click Update Firmware.


3. Click to select an available version, and click Updates.



Q16:When I restart the robot, the RGB LED light flashes irregularly. What should I do ?

Wait for 10 minutes and restart the robot.



Q17: How to use the ranger test version?

Please refer to the online tutorials .



Q18: What should I do if the motor gets hot after a long time of operation?

Stop working or turn off until it cool down.



Q19: How do I restore the factory settings of mBot Ranger?

Step 1: Make sure you have download and install mBlock 3.4.11
Step 2: Connect your Ranger to your computer.
Step 3: Open mBlock, then select the correct serial port from the menu "Connect" option, and select Me Auriga from the "Control " option.  
Step 4: Click connect->upgrade firmware and wait for 100% of the installation progress to complete.  


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