I try to build laser engraver.
- 2x NEMA17 1.5A
- 2x step drivers TMC2209
- MKS DLC v 2.0
- power supply: 12V 8.3A
OpenBuilds CONTROL - Machine Interface Controller
When I connect engines to board it moves but when I use belt to move caret or just touch a pulley engine stop moving.
I try to set Vref using stepper driver screw but value oscillates around 0.10 - 0.14 V.
I search websites and it should be near 1.5V reduced to 70% for safety (= 1.05V) but its hard to get even near that value.
I measured it with only power on (without connected USB and engines) between pin EN and GND or stepper screw and GND - values was the same.
Is there another switch or screw to change this volume?
Thanks fo any help