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12V DC encoder motor drive board

Overview

Functionality: This system uses four BTN7971B microcontrollers to control two motors, enabling forward and reverse rotation and PWM speed control. Reversal is achieved by switching the positive and negative polarities, and speed control is achieved through the PWM duty cycle (100% duty cycle equals maximum motor speed, 0% stops).
Operating Requirements: The BTN7971B can theoretically drive 5-12V DC motors. If you need to drive 5V or 7.5V motors, the power supply module needs to be modified. My system uses a 12V input, and the board has 5V and 3V3 ports for expansion. I/O isolation circuitry is included to prevent reverse current from damaging the microcontroller.
Note: The PWM frequency is best between 1kHz and 10kHz; otherwise, the isolation chips may be damaged! Also, please ensure the encoder interface location corresponds to your motor when designing the board.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-28 00:37:23

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