Help! ESP32 burnt by Motor Drive Module.

[username]

its possible. Another option to try on a new motor driver board to help is to put a 100 or 220 Ohm resistor in series with your 2 control wires and PWM wire to your driver board.

[human890209]

its possible. Another option to try on a new motor driver board to help is to put a 100 or 220 Ohm resistor in series with your 2 control wires and PWM wire to your driver board.

Thanks. I will try that. Could you tell me the physics theory of the small resistor? Do they protect the ESP32 from shortcut or something else?

[username]

Thanks. I will try that. Could you tell me the physics theory of the small resistor? Do they protect the ESP32 from shortcut or something else?

resistors limit current. the higher the value the more they limit. For example, if you set a GPIO pin high, but that pin is shorted to gnd for whatever reason you will wind up blowing that pin. However, if you had a series resistor in line with that pin and this happened you would protect that pin from that happening.

[human890209]

I understand now. Thanks.