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BB X32 GRBLHAL Limit Switch Setting for NC Limit Switches

Discussion in 'CNC Mills/Routers' started by Scott Thompson, May 6, 2024.

  1. Scott Thompson

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    On my Lead CNC machine I am migrating from an Arduino GRBL setup to the Openbuilds BB X32 controller running GRBLHAL. I have been running my CNC with the limit switches set to normally closed (NC) and want to continue with this configuration with the BB X32 (see attached diagram). What setting should $5 be and can the BB X32 handle this or do I have to add pull up/down resistors?
    Thanks,
    Scott

    regular-microswitches.png
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    $5=0 if they are all NC
     
  3. Scott Thompson

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    Thanks Peter ... no need for pull up/down resistors?
    Scott
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    No need no.
    Endstop inputs on BlackBox has pullups (in NC pulling it up to a HIGH state when triggered, switch pulls it DOWN when untriggered) and RC filter+Optocouplers
     
  5. Scott Thompson

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