IR Height Sensor

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IR Height Sensor

Guide for posting requests for help
• T3P3Tony

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New IR-Probes -> false Triggerheight
• CR3D

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I made a change to the firmware on the IR sensors a few months ago. This was to resolve a problem whereby when using a highly reflective bed surface (e.g. white or shiny aluminium), some probes gave a false trigger at a great height (usually several cm) as well triggering at the correct height. So the newer sensors don't trigger unless the total received IR is above a certain threshold. I verified that they still work with dark surfaces, including black/grey BuildTak and with glass backed by black paper. You can tell if your sensors have the new firmware, because at startup it gives one short flash, then a pause of about 4 seconds, then the usual 2 or 4 flashes depending on what mode it is in. The older firmware doesn't give the short flash at the start.
Build surface options
• SupraGuy

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Printbite and dc42 IR Sensor (2019)
• Baal

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I have the older "beige" color and it didn't work well with the IR sensor. I'm sure @dc42 will weigh in when he has a chance but I'd think the black matte surface would give the best/most consistent results. I would think that a clear material would create too much opportunity for reflections from the top surface as well as the bed especially if the adhesive isn't perfectly bonded to the bed in placed. On the other hand, it worked for you previously.
Z-IR height is too high off the bed when printing
• shaunppl

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@eran898 For you to admit the problem was down to human error and not the hardware, only confirms what I was saying. glad you worked it out. There are instructions on how to install/configure the IR sensor on non duet electronics on David's Website.
SOLVED IR probe and Duet Maestro
maestro irprobe • • Maut

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@simplesimson said in IR probe and Duet Maestro: Hey, i´m still having the same problem. Do I need to use M558 P2 for the "digital probe"? if I do so, the Probe Z status in DWC shows 0 (5) when not triggered and 0(1000) when triggered. By Triggerd i mean a red LED. Sorry for the late response. M558 P1 is correct for the IR sensor that we sell. P2 is only for the sensor that RepRapPro included in the Ormerod 2 printer and I think also the Huxley Duo and one of their Mendel printers.
IR probe on roughed up mirror?
• Eumldeuml

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Thanks for your replies! I will test that as soon as I get my printer up and running again!
IR probe playing up
• Corexy

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Thanks very much for taking the time to type all that. I did pull it down, and there was a sign of impact on the probe. As it goes, the spare I had on hand was the new type. I bolted it up, set the nozzle height (which was exactly the same as the old one), and it's away and printing. I'm very much out of my depth with the programming on this thing, but my wiring and build has been solid, as this thing's been an absolute workhorse for almost 3 years. I actually bought 2 sets of gear (I have 3 more dead Zortrax's sitting there), and have never bothered fitting up the second. I'm going to have to bite the bullet and try and update the firmware though I guess...take a deep breath David! We know how that's gone every time, lol.
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 .
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.
IR sensor off during print
• noisettetbou

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Nice, glad it worked out for you.
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.
SOLVED Change Z-heigt Anycubic Predator
• Chaosfreak

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fixed. I did the full calibration again. Thanks
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.
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.
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.
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!
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
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...