zonkedhaircut

Hi everyone,

I’m currently working on a small robot arm project using an Arduino Uno and a couple of NEMA 17 stepper motors. I’ve run into a bit of confusion regarding powering the stepper motors with an external power supply.

Right now, I’m using the A4988 driver modules, and I’ve read that it’s important to connect the grounds of the Arduino and the external power source together to avoid erratic behavior. My question is:

What’s the safest and most ...