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Mini differential IR height sensor board

Posted by dc42 
Re: Mini differential IR height sensor board
October 14, 2016 01:31PM
Hi Jerry, I think you need to configure it as a fixed probe, but I can't help you beyond that because I haven't used Marlin for two years. Try asking in The Firmware - Mainstream section.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
October 14, 2016 03:14PM
Hey you wordpress site shows a v 1.2 of this board? Is that released and/or available? Whats the difference between that and v 1.1 board?
Re: Mini differential IR height sensor board
October 15, 2016 10:57AM
Version 1.2 uses SMD optical components and works with a wider range of reflectivity of the bed surface. They have been shipping for a few weeks.

Edited 1 time(s). Last edit at 10/15/2016 11:00AM by dc42.

Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
October 17, 2016 09:29PM
Quote
dc42
Version 1.2 uses SMD optical components and works with a wider range of reflectivity of the bed surface. They have been shipping for a few weeks.

Does this version of the board produce more constant results across different parts of the bed? (i.e. margin of error reduced across different points).
Re: Mini differential IR height sensor board
October 21, 2016 05:22PM
Hello David,

I bought several of your different sensors for my ormerod and one of your mini sensors a while back probably 18 months or so. I have only just got round to incorporating the mini sensor into my new coreXY, I have a Duet 0.6 left over which I have used for this. As per the instructions on your website I connect the power to the sensor from the extruder endstop connector and the out pin to the AD12 pin (6th pin across from the ethernet connector end on the row nearest the processor.

So I think it is setup correctly, Multimeter shows 4.25v on the power lines, I thought this should be 3.3v from the board layout displayed in Kicad showing extruder connector.
However, the red LED lights up continuously, there is no flashing at any time.
Web interface shows a value of 715 which never changes.

Is the board toast in your opinion or is there some other debug I can try to see what miss-configuration I might have made?

Lloyd
Re: Mini differential IR height sensor board
October 22, 2016 12:52AM
If the LED is on permanently but dim, this usually means there is no 3.3V or 5V power to the sensor. Please measure the power between the top end of the inductor L1 on the sensor and the ground test pad which is above the D2 legend. If you are getting 4.25V between them, send me a PM with your invoice number and I will replace the sensor.

However, if the 3.3V rail on your Duet is at 4.25V then you need to fix that because the SAM processor won't like being run at 4.25V.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
October 22, 2016 09:03AM
Hi

Interestingly, the 12V LED power supply from ebay was setup to provide 15v from the manufacturer. I have never actually looked at this I just assumed a 12v PSU did as it advertised.
With 15v the Duet regulators produced the 4.25v on the 3.3v line.
So I turned the preset pot down and unfortunately, this only reduced the voltage to 13.5v and still left the 3.3v line at 4.25v,

I suspect but have no proof, the regulator for the 5v and then 3.3v lines saturate at somewhere about 12.5v and then clamps the output of the 3.3v line at 4.25v

If this is the case then other people who have turned this pot on their power supplies up to 14.5v to get better heating times etc, may be running their SAM processors and 3.3v logic at 4.25v instead.

As you say probably not a good idea long term.

I then removed J9, which forces the Duet to use the USB to power the duet and low and behold the 3.3v supply is now 3.3v

Needless to say, I will be investing in a better quality PSU which can provide 12v when requested.

Lloyd
Re: Mini differential IR height sensor board
October 22, 2016 09:52AM
Hi Lloyd,

The Duet is quite happy with up to 30V power, so 15V is no problem for it. But it sounds to me that the 3.3V regulator on your Duet is probably faulty and should be replaced. With USB power there is an additional diode in the circuit, which would account for the 3.3V rail being nearer the correct voltage.

David


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
October 22, 2016 11:02AM
Hi

ok, for the moment I have plugged a mains to 5v usb charger in to run the Duet from the USB socket and that seems to provide the correct voltages etc.

Lloyd
Re: Mini differential IR height sensor board
May 08, 2017 09:54PM
Hey

I know this is a 3 year-old post but would but I want to use this to connect to an arduino so just print out the distance and i will adjust till the desired distance is reached. will this set-up work?

Also I have a mirror as my build plate will it work on the mirror?

thank you

Edited 1 time(s). Last edit at 05/08/2017 09:57PM by bshady3.
Re: Mini differential IR height sensor board
May 09, 2017 12:53AM
You can buy the sensor from me here [escher3d.com] or in the USA from Filastruder.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
May 09, 2017 11:05PM
will this work on a mirror bed?
Re: Mini differential IR height sensor board
May 09, 2017 11:15PM
Mirror is one of the few surfaces we advise against. See section "Bed surface" at [miscsolutions.wordpress.com].


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
June 12, 2017 10:48PM
Hi David,

Just did the measurement you requested in your post of januari 6 2016. My megtronics board (ramps 1.4 based) with fresh marlin 1.1.x takes 6 full seconds to enable pullups on the endstops. So my sensor needs unplugging and replugging after every startup to make the led blink twice instead of four times.
Is it possible for me to flash the sensor firmware with a custom startup time? If not I will use the physical pullup resistor that you suggested.

Cheers,

Diederik van der Pant

Edited 1 time(s). Last edit at 06/12/2017 11:09PM by djvdpant@gmail.com.
Re: Mini differential IR height sensor board
June 12, 2017 11:23PM
Yes it would be possible to increase the delay from its current value of 5 seconds. You can find the firmware source at [github.com]. But unless you have a suitable programmer, it's easier to add the pullup resistor.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
November 24, 2017 12:02AM
Hi,

So yesterday my Mini IR Board arrived which i installed promptly. I did some UBL test measurements as well as repeatability tests and i was impressed with the consistent readings the sensor delivered throughout the mesh of my plate. I had also adjusted my Z height properly via storing an offset so as to have the desired distance of the nozzle from my glass bed. However now comes the not so happy part. I wanted to do a quick grid level check print and there i saw the the measured heights for the nozzle are way off at some points. What i mean by that is that the print starts normally and lays down good lines but at certain sections of the bed the nozzle is clearly too high (at some points this seems to be roughly 2mm-ish above the bed!). Of course this results in spagetti layers which don't stick to the glass at all.

I have a Wanhao I3 printer with a 4mm glass plate. The bed under the glass plate is almost completely black. There are a few spots which have white logos and writings on them as well as some corners where i still have some green silicone pads. I use Ramps board running Marlin btw.

I'm kinda bummed about these results as the probe was quite fast (compared to my BL Touch which requires constant deploying per point) and the accuracy of the repeated measurements seems to be excellent however i guess the accuracy of the actual measured distance between the glass and the desired set Z height is sometimes way off which results in the above described behavior.

Is there any special setting i may still need to tweak in my marlin config or anything else that i could do to improve the measured distance to my glass plate?

Cheers
Re: Mini differential IR height sensor board
November 25, 2017 03:07AM
Hi,

My guess is that the differences in trigger height correspond to the points where the surface under the bed is not black (although 2mm sounds like a very large difference). Can you confirm this? If so, here are some possible solutions:

- Put a piece of black paper between the glass and the bed plate
- Paint the white parts black
- Adjust the probing grid parameters to avoid parts that are not black
- Use black glass instead of clear glass

One other possibility is that you have bright sunlight reflecting off the bed into the phototransistor, causing it to saturate. If that happens, the LED will blink rapidly to warn you. It can be a problem if you have a south facing window (in the northern hemisphere) and it is a bright sunny day, especially in the winter when the sun is low.

HTH David

Edited 2 time(s). Last edit at 11/25/2017 03:10AM by dc42.

Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Mini differential IR height sensor board
November 25, 2017 05:22AM
Quote
dc42
Hi,

My guess is that the differences in trigger height correspond to the points where the surface under the bed is not black (although 2mm sounds like a very large difference). Can you confirm this? If so, here are some possible solutions:

One other possibility is that you have bright sunlight reflecting off the bed into the phototransistor, causing it to saturate. If that happens, the LED will blink rapidly to warn you. It can be a problem if you have a south facing window (in the northern hemisphere) and it is a bright sunny day, especially in the winter when the sun is low.

HTH David

Hi David,

Actually where i noticed these incorrect heights are over areas that are black. Sunlight is also not a factor as that does not reach the print bed in such a direct way nor was it a sunny moment when i did this. The leds did not blink as far as i remember in the sort of pattern that you mentioned.

Atm i have my printer disassembled for other reasons but i will give it another few trys next week.

Cheers
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