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o_lampe
It seems, the shift registers need some initialization code to configure MS1-MS3 of the drivers? Or are they pulled to GND automatically?
Why not use a RAMPS shield with GRBL?
I thought about changing the shield but I've payed for it and honestly has become a matter of principle :D
That I know the pins MS1-MS3 on driver are as basic (full step). I have not touched them; the GND of the shield are all connected.
Forgive me if I say something stupid but it's my first electronic experiment.
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VDX
... could be, your drivers draw more current from the +5V of the Arduino, than the voltage regulator can deliver -- so the +5V of the Arduino breaks down and the program stops.
If it's working fine without connecting, then the +5V for the drivers are sourced elsewere ... so better let it "open" ...
With multimeter on shield I've detected a voltage about 4V when test driver's pin 5V with 5V disconnected in fact :D
This thing becomes stranger to any test, but everything works great with the pin disconnected so I'll leave it and see what happens when mounts the engines and will be under stress
I pray do not cause a fire or my wife will not be so happy I think X(