[Erin RobotGrrl]

Hi Thor community!
I’m looking through the documentation, and it isn’t clear to me if we’re supposed to add the microstepping jumpers in.

That is, the jumpers for P1 – P8 that are underneath the stepper drivers. I see on the A4988 datasheet that having all 3 jumpers would be 1/16th step, and it looks like there’s defaults in grbl that can change accordingly.

Any clarity on if the jumpers should or should not be added would be appreciated!
Thanks!-EK

[Angel LM]

Hi Erin,
Sorry for the late reply! Each stepper driver has 3 legs named “MS1”, “MS2” and “MS3”. Each of those legs is conected to a pin in the ControlPCB. Jumpers connect “MS” legs to “HIGH” level signal (5V). So, having the 3 jumpers connected means to have a 1/16th configuration (this image ilustrates all the possible configurations). My recommendation is to connect all pins to get a 1/16th configuration, but if you want a different one you have to put the jumpers and modify grbl according to the new configuration.
Hope it helps!Angel LM

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