Driving a brushless DC (gimbal) motor can be a pain in the transistors. [Ignas] has written up a nice article not only explaining how to do just this with an Arduino, but also explaining a little ...

If there is any motor drive voltage, one or the other LED will be on, as will the associated output transistor. The Arduino will see both inputs of the pair high if there’s no motor power, and ...

Base emitter resistors on the tow ‘third’ transistors might also be a good precaution. Beyond this circuit, the main bridge transistors could be replaced with mosfets to increase efficiency, or a ...

The machine uses a ‘grbl’ controller, which has an Arduino-based circuit that includes multiple outputs, including a powerful 24V pwm signal that is generally used to drive a 60-80W spindle motor..