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    IR Probe issue

    Tuning and tweaking
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    • Prawnabie
      Prawnabie last edited by

      Hi all,

      I am currently configuring my IR probe and cant seem to get it to home my Z axis properly..

      The edge of the board it just over 1mm higher than the nozzle and I get 4 flashes when I switch the machine on. I am also using blue tape on the bed under the sensor. I get a reading of 0 with nothing under the sensor, 4.65 with a piece of paper near the sensor and 538 when the led lights up.

      I send M558 P1 followed by G31 P500 Z1.0, then lower the head to grab a piece of paper and send Z92 Z0 to the printer, raise the head by 5mm and then send G30 S-1 which gives me a head height of 2.84mm. I enter the value into my G31 line in the config.g and cycle the power but the head always homes to 2.84 and obviously this is over a couple of mm too high. Am I missing something as the way I see it the firmware knows I want to home at 0 hence the g92 command and it knows the trigger height - what am I missing to make it get to 0 once the sensor triggers?

      Thanks in advance!

      ; General preferences
      M111 S0 ; Debugging off
      G21 ; Work in millimetres
      G90 ; Send absolute coordinates…
      M83 ; ...but relative extruder moves
      M555 P2 ; Set firmware compatibility to look like Marlin

      M667 S1 ; Select CoreXY mode
      M208 X0 Y0 Z0 S1 ; Set axis minima
      M208 X290 Y100 Z100 S0 ; Set axis maxima

      ; Endstops
      M574 X1 Y2 Z0 S0 ; Define active low and unused microswitches
      M558 P1 X0 Y0 Z1 H5 F200 T5000 ; Set Z probe type to analog, the axes for which it is used and the probe + travel speeds
      G31 P500 X0 Y0 Z2.84 ; Set Z probe trigger value, offset and trigger height
      M557 X15:85 Y15:85 S20 ; Define mesh grid

      ; Drives
      M569 P0 S0 ; Drive 0 goes backwards
      M569 P1 S1 ; Drive 1 goes forwards
      M569 P2 S0 ; Drive 2 goes backwards
      M569 P3 S1 ; Drive 3 goes forwards
      M350 X16 Y16 Z16 E16 I1 ; Configure microstepping without interpolation
      M92 X100 Y100 Z400 E418.5 ; Set steps per mm
      M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
      M203 X5000 Y5000 Z180 E1200 ; Set maximum speeds (mm/min)
      M201 X2000 Y3000 Z250 E250 ; Set accelerations (mm/s^2)
      M906 X800 Y800 Z800 E800 I60; Set motor currents (mA) and motor idle factor in per cent
      M84 S60 ; Set idle timeout

      ; Heaters
      M143 S290 ; Set maximum nozzle heater temperature to 250C
      M307 H0 A410.7 C190.6 D5.0 B0 ; Bed heater autotune results
      M307 H1 A516.2 C193.2 D5.5 B0 ; Nozzle heater autotune results
      M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0 (Bed)
      M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1 (Nozzle)

      ; Tools
      M563 P0 D0 H1 ; Define tool 0
      G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
      G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

      ; Network
      M550 PCoreXY ; Set machine name
      M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP

      ; Fans
      M106 P0 S1 I0 F500 H1 T40 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
      M106 P1 S0 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P2 S0 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

      ; Custom settings are not configured

      ; Miscellaneous
      T0 ; Select first tool

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      • Willy510
        Willy510 last edited by

        The mini IR sensor on my printer always stops Z at the triggered height when homing and running an auto level. The G31 Z offset is the amount past that triggered height that Z will move when printing. Have you tried printing anything?

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        • dc42
          dc42 administrators last edited by

          The purpose of homing is to establish a known position, which does not need to be zero. Your printer is homing correctly. If you want it to end up at Z=0 after homing, you can add command G1 Z0 to the end of homeall.g and homez.g. But it's not necessary.

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • Prawnabie
            Prawnabie last edited by

            Ahhh I get it now!! So the trigger height is just a reference position and the z0 command will be given to the printer when printing by the slicers g code?

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            • deckingman
              deckingman last edited by

              @Prawnabie:

              Ahhh I get it now!! So the trigger height is just a reference position and the z0 command will be given to the printer when printing by the slicers g code?

              Mostly correct but actually the first Z move will be to the Z position that corresponds to your first layer height is - i.e something like G1 Z0.3.

              Ian
              https://somei3deas.wordpress.com/
              https://www.youtube.com/@deckingman

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