Strange IR Probe Behaviour

  • Hi all,

    I'm having a real nightmare setting up an IR probe.

    Board: Duet Maestro 1.0 (duetmaestro100)
    Firmware: RepRapFirmware for Duet 2 Maestro 2.05.1 (2020-02-09b1)

    config.g extract
    ; Z-Probe
    M558 P1 H4 I0 F120 T12000
    G31 P500 X41 Y0 Z2.1

    When I first turn on the board the Z-Probe reads a value of 999.
    If I then send the above gcode through the console it drops to a value of 2.

    It will then home OK but will get 'stuck' at what seems like the trigger value. IE typically something over 500 but less then 999. It then stays at this value until I resend M558 P1.

    The sensor itself appears to be working correctly with 4 flashes on start and lights up when close to the bed.

    Any ideas as its driving me mad?


  • Moderator

    Do you have it wired up thusly?

    Connect the VCC, GND and OUT pins of the sensor to 3.3V, GND and IN respectively on the Z probe connector

    Is this a brand new ir probe?

  • Yes & yes. Tried 5v too but same behaviour. 😢

  • Moderator

    So it homes correctly and stops working? Or what exactly happens?

  • It will home correctly, usually just once but sometimes twice. Reapply the GCODE and it works again.

    Oddly I've moved this to another printer with a Duet2 Wifi and its working fine. Move it back to my Maestro and same behaviour.

    Have ordered another sensor but couldn't find a genuine one in stock anywhere, think the once I've ordered is a clone.

    Will wait and see.

  • Moderator

    Can you post your entire config.g and homing files just in case there is something odd in the gcode?

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