Linear hall effect Z-height sensing

Linear hall effect Z-height sensing One other possibility is using a low cost linear hall effect sensor such as the one detailed in the attachment, this can be used in 2 ways either by embedding small magnets just below the glass or by putting a magnet behind the sensor and sensing a thin layer or strip of magnetic material on or below the glass both methods would be none contact. I currently use the above to sense movement in an ac coupled sensor design and they have proved to be very reliable. Regards Mike https://reprap.org/forum/read.php?340,310427,310427#msg-310427 Mon, 07 Sep 2026 08:49:10 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?340,310427,313178#msg-313178 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,313178#msg-313178

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Mickyblueeyes
Hi Thanks for that, the circuit uses the same basic sensor element that I have here but not quite the circuit I need so I will go ahead and design something myself, the main problem with the design shown is that the analogue output change will be fairly small in my application and also I would prefer to have an on board psu to derive the 5V as the sensor is ratiometric it will suffer from variations and noise from the duet 5V supply.

Don't forget that the ADC on the Duet is ratiometric too. So if you can run your Hall sensor from the 3.3V supply, and amplify the output from it using a 3.3V rail-to-rail op amp, then supply voltage changes will cancel out.

OTOH I'm not sure that you will be able to get a sufficiently consistent magnetic field for a Hall sensor to be a reliable mechanism for height sensing.]]> dc42 Ormerod Wed, 19 Feb 2014 15:31:58 -0500 https://reprap.org/forum/read.php?340,310427,313093#msg-313093 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,313093#msg-313093

Best regards

Mike]]> Mickyblueeyes Ormerod Wed, 19 Feb 2014 12:23:21 -0500 https://reprap.org/forum/read.php?340,310427,313021#msg-313021 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,313021#msg-313021 This can be used as a digital or analogue and looking at drawing both at the same time.
Try this link [reprap.org]]]> Chris1965 Ormerod Wed, 19 Feb 2014 10:06:38 -0500 https://reprap.org/forum/read.php?340,310427,313007#msg-313007 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,313007#msg-313007
regards

mike]]> Mickyblueeyes Ormerod Wed, 19 Feb 2014 09:33:15 -0500 https://reprap.org/forum/read.php?340,310427,312566#msg-312566 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,312566#msg-312566 Found this www.reprap.org/wiki/Hall-Endstop if this helps. Found one on eBay to experiment with
I thought of putting removable bed with the magnets in or a small bed that moves with the hot end with the same magnet in.]]> Chris1965 Ormerod Tue, 18 Feb 2014 10:58:09 -0500 https://reprap.org/forum/read.php?340,310427,311274#msg-311274 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,311274#msg-311274 let us know how it turns out, I have several hall effect sensors in my parts bin, will try to find suitable magnet to experiment with.]]> tru168 Ormerod Sat, 15 Feb 2014 11:11:05 -0500 https://reprap.org/forum/read.php?340,310427,311153#msg-311153 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,311153#msg-311153
Regards

Mike]]> Mickyblueeyes Ormerod Sat, 15 Feb 2014 04:11:32 -0500 https://reprap.org/forum/read.php?340,310427,311116#msg-311116 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,311116#msg-311116 tru168 Ormerod Sat, 15 Feb 2014 00:50:56 -0500 https://reprap.org/forum/read.php?340,310427,310839#msg-310839 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,310839#msg-310839 Radian Ormerod Fri, 14 Feb 2014 07:50:57 -0500 https://reprap.org/forum/read.php?340,310427,310484#msg-310484 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,310484#msg-310484
regards

mike]]> Mickyblueeyes Ormerod Thu, 13 Feb 2014 11:53:57 -0500 https://reprap.org/forum/read.php?340,310427,310478#msg-310478 Re: Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,310478#msg-310478 Also be aware that is you would like to use the auto bed leveling (G32) that all magnets need to be detected at the same height (I guess positioning exactly in the middle).

Good luck]]> Marc van Beelen Ormerod Thu, 13 Feb 2014 11:47:50 -0500 https://reprap.org/forum/read.php?340,310427,310427#msg-310427 Linear hall effect Z-height sensing https://reprap.org/forum/read.php?340,310427,310427#msg-310427
I currently use the above to sense movement in an ac coupled sensor design and they have proved to be very reliable.

Regards

Mike]]> Mickyblueeyes Ormerod Thu, 13 Feb 2014 09:12:51 -0500