[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... a DRV8837 DC motor driver and a pair of hall effect sensors on the first PCB layer, with the ...

The low-cost servo motor in [Clough42]’s ... Not finding any obvious problem, he proceeds to the main PCB which contains the microcontroller, motor driver transistors, and power supplies.

A YouTuber has shared his latest project, Legion Mark I, a robot that can both crawl like an insect and drive like a car.