I’m working on a project where I want to control a motorized fader with an arduino. I have a dual H-Bridge board to control the motor, but the thing is that it is a 10V motor. I’m thinking of using a secondary power supply on the H-Bridge to power the motor with a proper voltage. So here is where my lack of electrical knowledge comes into play. My H-Bridge has the following connections: a set of +/- poles to provide the power to the motors, 4 motor control pins (2 per motor to control their direction) and 4 motor power pins (2 per motor).
If I was using the Arduino as the power source for the DC motor, I would connect the +5v rail to the + terminal ot the H-Bridge and the Gnd rail to the - terminal, which would, in turn act as the ground return for the control pins.
If I am to use an external power supply, how do I wire it properly so I don’t blowup the arduino or the h-bridge? I’m guessing that my secondary power supply will be connected to the +/- poles of the H-Bridge and the the - pole will also get connected to the Gnd rail of the arduino?
Is that correct?