I built AR4. I use software and sketch version 3.0. When I try to check all joints and try to auto calibrate, joints don't stop when they reach to limit switch. They keep moving until they break down limit switches. But calibration works when I try to calibrate only one joint.
Why they don't stop?
I found the problem. It's simple. The problem is because of GND. Because GND signal doesn't reach the limit switches, this error appears.