PicoBOB CNC Control Module for GRBLHAL

The PicoBOB is a credit card size GRBLHAL controller based on Raspberry Pi RP2040 microcontroller.  It allows you to use the high performance GRBLHAL motion control system with a traditional Mach3/LinuxCNC parallel-port breakout board. It is intended to be simple and low cost. It uses a Raspberry Pi RP2040 MCU and the widely available 5 axis Mach3 breakout board. It can also be used with the Gecko G540.

The PicoBOB closely tracks the features of the Mach3 BOB:

1. Up to 5 axes of step/direction control.
2. 10A Spindle relay control.
3. 0-10V analog spindle speed control.
4. 5 general purpose inputs
5. One general purpose output.

The default GRBLHAL builds for the PicoBOB include the following features that are implemented in the RP2040 port of GRBLHAL:

1. Backlash Compensation.
2. Stress-free Autosquaring for the ganged axis
3. Ganged axis offsets to correct for offset homing switches
4. Step rates tested up to 180 KHz on 5 simultaneous axes.

In addition, the board has a USB micro connector for the 5V that is required for the BOB. There is also a push button to reset the Pi Pico without disconnecting power.

The PicoBOB is also fully supported via the GRBLHAL web builder:
http://svn.io-engineering.com:8080/?driver=RP2040&board=PicoBOB

For complete documentation on this OSHW design, see this Github repository:
https://github.com/Expatria-Technologies/PicoBOB