Hi,
It was very complicated, because one of the motors was drawing to much current it heated original driver chip on motor shield very hot, so I removed it (chip) and conected A4988 by wires to shield (to some holes were chip was) to be able to control it from Arduino by programming shift register. I had only one A4988 avaiable and I wanted to use mout very badly and it worked, so it stayed that way for 2 years.
Now I am using Onstep with ESP32 and 2x TMC2290 drivers, It' works like a charm.

Read More...