Among these are the Serial Servo Raspberry Pi HAT, the Serial Servo based on ESP32, the Serial Servo Pico HAT, the Serial Servo Arduino Shield, and the Serial Servo Breakout.

[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly, but with a stepper motor-like interface. By stacking some small PCBs behind the motor body, it was po… ...

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An Arduino is used to determine the servo’s current position versus the desired position, and it turns the motor accordingly with a BTS7960 motor driver.