I am trying to understand if car wheel calibration is a common issue. Ran inito car wheel alignment issue: Tested wheels moving forward and backward fine using digitalWrite ( High and Low settings) Car can move in straight line forward and backward. However, in moving left or right, one motor see…

[image] danny28888: Car can move in straight line forward and backward. [image] danny28888: when both motors set at the same speed to move forward the car ends up in a circle It is common for DC motors to run at different speeds when powered from the same source and they may run at dif…

The kit is SunFounder 3-on-1 Ultimate Kit for Arduino Uno R3. The controller board is R3 board. The motor is TT motor (2 pc). I am in the process of completing the car assembly, successfully move the car forward and backward (no veering) with no speed parameters. When trying to the do the "follow th…

From my testing and calibration, it is obvious one motor is weaker than the other causing the veering. Arduino does provide calibration routine but it did not help. Thanks for your input, any further insight would be great!

It sounds like you may have a hardware problem in addition to all of the factors that I mentioned [image] danny28888: Is the wheel differential a common problem? If you mean the differences in circumference between wheels, then yes, but it is usually quite small and only causes problems when…

[image] danny28888: Is the wheel differential a common problem? Not common. Inevitable. Expensive motors will have less difference between them, cheap motors will have more difference. From your description, one of the motors might indeed be considered faulty. Even with expensive motors, en…

[image] danny28888: I found out one motor has very high friction to overcome, it would not move at speed under 200, even at speed 300 it still gets overcome by the stronger motor causing the car to veer. This is very common, and explains why wheel encoders and PWM speed control are used for a…

Its just a kit sold under $100. : )

I tried all the debugging and calibration, the weaker motor I am concluding is the issue. Thanks!

I don't really need a perfect straight line, just no severe veering so I can complete the "follow the line" exercise. : )

UNO R3 car wheel calibration

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Railroader December 12, 2025, 5:19pm 2

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UNO R3 car wheel calibration

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