This article applies to mBot Ultimate 2.0.
1. Issue Description
When the product is built in the form of Robotic Arm Tank and controlled through the program or Makeblock App, the actual running direction of the arm or motor does not match the control instructions. For example, after clicking the “CLAMP” button in the APP control interface, the robot arm actually does a “UNCLAMP” action.
2. Possible Causes
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The motor runs in the opposite direction because the motor wires are connected in reverse.
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The robot arm up and down in the wrong direction because the motor type is installed incorrectly.
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The robot arm releases and clamps incorrectly because the robot arm connection wire is connected incorrectly.
3. Troubleshooting Steps
For the above different fault phenomena, you can follow the corresponding steps below to check.
- When the motor runs left or right in a direction opposite to the control command, it is necessary to exchange the ports of the two motor connection wires (i.e., port 1, port 2) to correct the direction of rotation.
- For the problem of the arm up and down in the wrong direction, check if the coded motors controlling the arm are used incorrectly. Refer to the white label in the figure below, the motor with a parameter of 86RPM is used for the robot arm, and the motor with parameter of 185RPM is used for the robot to move forward and backward.
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For the problem of wrong clamp and unclamp direction of the gripper, please connect the white and black wires with the sequence shown in the image, then insert the plug to the 4B- and 4B+ ports on the mainboard. If the wires are connected incorrectly, use a screwdriver to swap the black and white wires at the orange terminal on the gripper. (Refer to the picture below)
4. Still Need Help？
If the problem is not resolved, please contact us via service@makeblock.com with the necessary details of the fault, such as order number, operation video, device firmware and software version.
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