I built a new pcb mill and am trying to setup Arduino/GRBL witb bCNC to run it. I found that bCNC seems to be working fine, but I am getting nothing out of the motors. I checked the enable pin on the Pololu a4988 driver board and I'm getting 4.55v between EN and the logic ground. I believe that would disable the driver. I checked the step pin on the scope and can see that it is receiving pulses. I changed the $4 setting to 1 reset the board, and got the same 4.55 volts.
I've also checked the motors and they work fine on another project.
Two questions:
Am I right in assuming that 4.55v on the EN pin of the driver board would disable the motors?
How do I bring it low when using the Arduino/GRBL/bCNC setup?