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Chip shortage GRBL controller

Aim of the project is to create GRBL controller to drive experimental CNC machine using NUCLE board.

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At the beginning I planed to make my own controller, but because of chip shortage I decide to make controlled based on owned NUCLEO-F411RE board.

I add header for NUCLEO with this design decision:

  • 24V-5V step-down power supply, based on MCP16301
  • all 6 axis buffered  with 74HCT541D and wire with shielded RJ45 connector -additional 9 output opto-isolated NPN
  • 15 input also opto-isolated
  • nice push-in wago 254 connection

because of not isolated power supply I decide to leave ground connected so there is possibility to destroy something, but risk is much lower than without opto-isolation.

Software based on https://github.com/Schildkroet/GRBL-Advanced

Software modification are simple:
  • change pin mapping for better pcb routing
  • enable all axis
  • enable external memory
  • add some additional commands for GPIO debugging (show state of input)

  • It works

    Piotr04/27/2023 at 23:05 0 comments

    Controller works without any big issues. I have few ideas for improvement, but for now work is finish.

  • TODO

    Piotr01/04/2022 at 22:20 0 comments

    Thinks to do to make this project in close state:

    • make some distance to tighten PCBs with deflection and prevent any shorts [DONE]
    • remove all unused pin header from nucleo [DONE]
    • clean PCBs after soldering and coat with something to prevent short

    And the most important:

    • intall in machine and make it all works. [DONE]

  • First test

    Piotr01/04/2022 at 22:16 0 comments

    All axis are working, but I have only one controller on hand:

  • Mechanical construction

    Piotr01/04/2022 at 22:15 0 comments

    At the beginning I want to mount PCB, screwing it directly. But because of quite big size I change my mind and make aluminum L-bracket to fix PCBs.

    To have better contact with ground in electric cabinet I decide to make long screws (piece of aluminum with threaded holes and glued hex screw on one side and piece of threaded rod on other)

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