Stepper motor driver not working properly I have a problem. I am following this guide about controlling a NEMA 17 stepper motor: https://www.makerguides.com/a4988-stepper-motor-driver-arduino-tutorial/
I uploaded the code to my arduino uno and powered on everything, but the stepper motor doesn't rotate, except when I put my finger on the metal screw of the a4988 driver. The arduino is powered by a 5v 1A adapter and the a4988 driver is powered with a 12v 2amp adapter.
What is causing this?
The &quot;metal screw&quot; is a &quot;trim potentiometer&quot; that is used to set the current used to drive the motor. It sounds like you may be altering the current when you push against it. Try turning it to different angles to see what effect that has on the motor.
Alternatively if it only ever works when you push on it then it could be that you have a faulty potentiometer on your board.