• Static sensitive devices -  Remove from anti-static packaging only when ready to install
  • Possible Fire Hazard -  This is an electrical device, seek professional help for installation if needed.
  • Damage to device - Power off main supply before attempting to install or detach any module or wires. Do not disconnect motors from main board while powered. Observe correct orientation when mounting drivers.


You will need to go over the Wiring Guide for the M1 PRO found here.  Gradus M1 PRO wiring guide

### Installing Drivers for your PC 

The M1 PRO uses an FTDI USB to Serial chip and requires a device driver to work on your PC. You can download and install the VCP drivers found on the FTDI website linked below. Install this before connecting the M1 PRO to your PC.

FTDI VCP drivers link


### Powering up the Gradus M1 PRO

The M1 PRO can only be powered using the main input connector as shown on the wiring diagram. It cannot be powered through USB as it is galvanically isolated to protect the host PC.

Power supply voltage input can range from 12V to 48V. We recommend 24V for most desktop size machines. Caution should be taken when using 48V supplies as it is near the input limit of 50V for the board. 

Do not install a power switch on the DC input of the board, cutting DC power to board via a switch (specially when running a job) can cause voltage spikes that can destroy the board or stepper drivers. Turn off power using a switch cutting off the AC line instead.


### Installing New Firmware

The M1 PRO already comes pre-installed with GRBL firmware so it is ready to use out of the box. If you need to install a new firmware you can use the pre-compiled hex file releases and use Xloader to upload. Below are links on how to use Xloader.

Xloader Guide

Pre-compiled GRBL Hex files


### Installing Stepper Drivers

The M1 PRO accepts regular pololu style drivers and our own Bigfoot profile drivers. Make sure that the driver modules are oriented correctly and double check that the headers match with that of the board. Install the micro stepping jumpres on the bottom of the pololu style drivers before installing the drivers itself. The Bigfoot drivers has these on top of the driver boards.

Pololu Style Drivers

Bigfoot Style drivers


### Connecting Stepper Motors

Stepper Motors consists of 2 separate coils that needed to be wired correctly to move the axis to the right direction. Markings in the board that says B1/B2 are for one coil and A1/A2 for the other. You can disregard the wire colors on the illustration as motors will come in different wiring configurations and there are no set color standard.

To determine which wires belong to each coil set you can follow this procedure.

Short any two random wires of the four and try spinning the shaft of the motor by hand, if it does not spin freely and has a bit of gritty feeling then you have a matching pair. If it does spin freely chose another wire. If you find a match mark each set and connect one to B1/B2 and the next set to A1/A2. At this point it is ready to test the motors. 

If you need to change the direction of the motor you can swap wires on one of the sets. You can do this by say swapping A1 and A2 wires. The direction change can also be done in software configuration. 


NEXT: Changing GRBL configuration of your board using a Host Software