Ive got a Tronxy X5S upgraded with my own mods. I have this glass bed https://www.amazon.co.uk/gp/product/B07FLBLTXF/ref=ppx_yo_dt_b_asin_title_o06__o00_s00?ie=UTF8&psc=1 and DC's IR bed sensor. I purchased a matt black peice of card from WH Smith, cut it to size and placed it between the bed and glass. Everything works a treat and my heightmap could not be better. My prints are top notch too.
The Ormerod printer uses the IR sensor not only as the Z probe but also as the X endstop. There is a tab mounted at the end of the X axis, which the sensor sees. The sensor must not be too close to the bed during homing, so that it doesn't respond to the bed, only to the tab.
I hadn't considered the possibility of sensing the edges of the bed instead. The problem would be working out a sequence of moves that will succeed in homing regardless of the initial position. One possibility might be:
With reduced motor current, move both X and Y a small amount in the negative direction, to ensure that the probe is over the bed. If X or Y is already at or close to the minimum stop, the reduced motor current will avoid damage.
Home Z using the sensor.
Drop the head a little, invert the trigger polarity in M558, then home X using the sensor to find the +X edge of the bed.
Move back a little in X to place the sensor over the bed again, then home Y using the sensor.
Move to bed centre, restore the original trigger polarity, and re-home Z.
I already have that T0 Command in my Config, so i could have both print cooling fans as "Tool Fans" right after Startup.
Gonna check that M558 the next time i screw smth up.
Oh, and keep up the good Work, great piece of Hardware you made there!
Update: after the print I turned off the printer turned it back on and now the ir probe
shows 539 and not 538 when an object is close also now when it nears the bed at 464 it slows down and home s
perfectly. I did nothing just turned off then on.
We can solved for the moment.
@gbiski said in Ir probe results:
Can I ask what I do wrong ? I homed the Z with the Endstop. At the centre of the bed the distance was just equal to be able to drag a paper. So I guess the Endstop zeroed correctly.
Your Z homing s set up correctly if, when you home Z and then command the head to Z=0 and some suitable XY position, it just drags the paper. The position after homing is not necessarily Z=0, it depends on what you have in your homing files.
If you purchased the sensor within the last 6 months, and the board hasn't been damaged physically, ask your supplier to replace it under warranty. Otherwise, is there a makerspace or similar in your area, where someone else may be able to help you replace it?
I can replace the LED, but unless you are in the UK then the costs of postage to and from me may make it un-ecomonic.
The ir sensor is the one sold on 1233d.nl. This one does not seem to be the same one sold on duet3d.com (picture looks different). I've ordered the one from duet3d and hope that one will work better, as even on the white PEI sheet, the results fluctuate.
Something isn't right, however the probe will still work even if the Duet is configured for analog mode and the IR sensor is producing a digital output. You won't get the benefit of the probing move slowing down when the probe gets close to trigger height.