IR Height Sensor

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  Guide for posting requests for help
  • T3P3Tony

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  IR Probe readings
  • droftarts

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  @droftarts Yes i think having multiple values for the reading with an analog z probe like the IR sensor is expected behaviour. ideally that would be a linear ramp from where it can "just see" the bed to 1000 when its saturated. The trigger amount should be picked to give consistent results with your bed surface. You can jog the axis down in small increments to see the profile of the readings at different heights and then use that to select the trigger height, I would normally have it trigger some amount above the Z0 position and then adjust the z probe offset .
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  Using IR Height Sensor with Duet 2 at 5V?
  • martink

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  Yes it will affect the output levels. The IR sensor output is referenced to 5V but the ADC on the Duet is referenced to 3.3V. the 1.04 Duet is OK with up to 5V going into the Zprobe input, but you will have to see what the actual Z probew readings are. Instead if being about 465 and 535 (allowing you to use 500 as the threshold), they will be about 51.5% higher. You will need to adjust the threshold accordingly. Alternatively, use a 3.3v regulator on the print carriage, for example one of these if you want something easy to solder https://www.mouser.co.uk/Semiconductors/Power-Management-ICs/_/N-wnwh?P=1z0wa2eZ1z0z60lZ1z0y3js.
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  Z-IR height is too high off the bed when printing
  • shaunppl

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  @phaedrux I think I figured it out... I bought sensor #1 Feb 28th, 2018 and sensor #2 on August 1st, 2018. Had always used sensor #1 and had it working for approx, 2 months? Then I moved and it stopped working. Just switched the sensor out with #2 to see if it would work and it activated correctly above the bed surface and is printing which is a HUGE relief. Thank you so much guys for your help, I will let you know if this was the end all be all solution. @dc42 Sensor #1 was activating the lights twice, once at approximately 6mm above the bed and if I turned axis limits off it activated again at the correct height. Is there any reason for this or is it a dud sensor? I can take a photo of both next to each other for you. They both say they are V1.3 on the rear but the #2 board has no diagnosis holes right of the chip, and the holes (right of R1 and right of R3 are soldered up). Thanks again! Ian
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  IR sensor off during print
  • noisettetbou

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  Nice, glad it worked out for you.
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  dc42 IR Probe Readings Not Consistent
  • DocTrucker

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  I've got a 8mm detection distance inductive sensor on order. I'm happy withthe 3DLAC / hair spray on the glass plate as it keeps the consumable costs low. Size of the sensor is a bit of an issue, but will try the touch sensors if this doesn't work.
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  SOLVED Change Z-heigt Anycubic Predator
  • Chaosfreak

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  fixed. I did the full calibration again. Thanks
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  4 point bed levelling question
  • andymoz

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  With the IR probe, depending on age or last cleaning, 1 /2 /3 layers of elmers glue stick randomly. But different thickness in different places over the bed as I am not exactly an artist, it comes off with print etc. Seems to make a big enough difference to mean first layer is either too low or too high and needs baby stepping by up to 0.1-0.12mm sometimes.
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  Z endstop and DC42 IR sensor. First layer
  • Rina

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  @Rina, I suggest you remove the G92 Z commands from your homeall.g and homez.g files, and instead set your max Z in M208 to 259.35.
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  IR Probe being overly sensitive?
  • richw

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  We've see that behaviour with a small number of new IR sensors, and recently I've changed the firmware to make it less likely to happen. But if the sensor has been working well for nearly 2 years and you haven't changed the bed surface, then the change might be caused by contamination of the optical components. Try cleaning them with a cotton bud moistened with isopropanol. If you are in the UK then I can reprogram your sensor with the new firmware if you like. If you are outside the UK then the postage probably makes that uneconomical.
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  IR Probing Issue always showing values around 990 to 1000
  • Pradeepkumar

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  Z Height
  • Dqtreats

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  You've not said what IR sensor you are using. Some are strongly influenced by ambient IR light, be that clouds moving and soaking your machine in sunlight or turning on and off a halohen/filament desk light. Edit: Just seen M665 relates to delta machines. Want one, but don't have one so I'll leave you lot in peace now!
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  Change the z offset via gcode
  • CR3D

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  You could use a macro that automates measuring the G31 z offset using G30 S-3 and use M500 P31 to save it to the config-override. https://duet3d.dozuki.com/Wiki/Gcode#Section_G30_Single_Z_Probe https://duet3d.dozuki.com/Wiki/Gcode#Section_M500_Store_parameters
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  IR Probe Z-Offset to big???
  • CR3D

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  Ok... i want to report the results... After I changed the IR Probe... the error was gone .. Thank you dc42! Sometimes there is a little error between the measurements... I think I should slow down the speeds...
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  BLTouch nonsense
  • Andy Cohen

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  when you reinsert the pin start the self test and adjust the grub screw so that it can deploy and retract correctly.
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  SOLVED NPN Probe and Error: M280: Invalid servo index 3 in M280 command
  • Worelock

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  Great! Now you can mark this thread as solved
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  Mesh Bed Compensation woes...
  • Credo

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  That was exactly the issue. the white rhino logo on the bed had a different effect on the compensation process. Thank you! Now I have to look for a bed with a solid color. Time to spend on a BuildTAK surface. Ho-Hum.
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  Printing on surfaces or objects.
  • cookie

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  Define probe offset from extruder.
  • MKR2

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  @devleon Thank You !
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  IR sensor configuration
  • mrcrow

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  @mrcrow I am using an ir sensor with glass I tried black paper and it didn't work that well, I switched it out for cheap matt vinyl vehicle wrap stuck to the bed then covered with the sheet of glass, that is working a treat.