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Problem with Gradus M1 Pro probe input

Discussion in 'CNC Mills/Routers' started by scottlbaker, Aug 12, 2019.

  1. scottlbaker

    scottlbaker Well-Known
    Builder

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    I'm trying to bring up a Gradus M1 Pro board on a CNC router. Using the Universal Gcode Sender program, I can move the motors OK, but the G38.2 probe command doe not work correctly. The probe motion often stops early before the probe contacts. I suspect noise on the probe input is causing an early/false trigger. In my test setup, the probe wire is short and not run close to anything noisy.

    >>> G38.2 z10 F1
    [PRB:0.000,0.000,6.368:1]
    ok

    I contacted Panucatt about this and they mentioned a possible mod of adding a filter cap to the probe input, but so far they have not provided any details.

    Has anyone run into this problem and if so what was the fix?

    Thanks,
    Scott
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    Yip, going to need a 0.1uf 6.3v cap over the input (one leg to gnd, one leg to probe input) as near the board as possible. A 10k pullup between 5v and probe input will help even more:
    Solving Endstop Woes With A Simple Analog Filter is a great article on the topic
     
  3. scottlbaker

    scottlbaker Well-Known
    Builder

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    Thanks Peter. I added a .1uF cap and a 10k pullup to 5V and that fixed the problem.
     

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    Peter Van Der Walt likes this.

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