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Problem with Gradus M1 Pro probe input

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

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  1. scottlbaker

    scottlbaker New
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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
     
    #1 scottlbaker, Aug 12, 2019
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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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
     
    #2 Peter Van Der Walt, Aug 13, 2019
  3. scottlbaker

    scottlbaker New
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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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    #3 scottlbaker, Aug 14, 2019
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  4. Scotty Orr

    Scotty Orr Journeyman
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    I know this is an old topic, but I just took advantage of the flash sale on the OpenBuilds XYZ probe. If using it on the M1 Pro, do I still need to make these modifications, or is the filtering built into the XYZ probe? I plan on hooking up the 5V for led and filtering to the same header as the OP did.
     
    #4 Scotty Orr, Dec 17, 2022
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Filters are built into the Blackbox, not the Probe. Noise is on the wire, so no use filtering on the far end, the controller should clean up the incoming signal.
     
    #5 Peter Van Der Walt, Dec 17, 2022
  6. Scotty Orr

    Scotty Orr Journeyman
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    OK, so I should add the cap and resistor to my M1 pro. I just wondered from what I read in the XYZ docs about connecting to generic controllers:

    I assumed that meant noise filtering circuitry on the XYZ Plus itself.
     
    #6 Scotty Orr, Dec 17, 2022
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    There is, but if (as the person earlier in the thread) the EMI is introduced into the cable, you need the cap and pullup near the Controller side.

     
    #7 Peter Van Der Walt, Dec 17, 2022
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