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I would be happy to buy your sensor, but delivery to our country does not work. If possible, share basic information about your developments (source code is not needed), this is very interesting and can motivate many to develop their own sensors. From simple ideas, study the BCL-AMP circuit and create on one board together with a fast microcontroller (like on BCS100) and EtherCAT on LAN9252.

Rod wrote :  Lukasz at Proma is very impatient!  

that's not true Rod , I'm an extremely patient person.
The fact that the shipment arrived quickly has nothing to do with it.

However, I must admit that I am very curious about the first attempts with LinuxCNC.

@stkvit
Apologies, your original user profile got deleted by accident.

stkvit wrote:

very sad, i use linuxcnc for open-source, i like to develop my devices, as 99% of linuxcnc users. what is the price of your device?

As I mentioned, this device was developed as part of my commercial control system, which is my source of income—it is purely a commercial endeavor (I make a living from designing and producing these devices). It operates similarly to other commercial solutions, such as MESA controllers. However, I am working on adapting the device to also be compatible with open-source projects, such as the excellent LinuxCNC.As for the price, it has not been precisely determined yet, as the project has been evolving for a long time and continues to change. In fact, I am not even 100% certain it will reach the market, as this is one of the most challenging projects I have worked on, and I am encountering many difficulties.If everything goes well, the initial promotional price is estimated to be $199 USD.

Great work!
What was the tweak? Tommy will want to know!

made a tweak

very sad, i use linuxcnc for open-source, i like to develop my devices, as 99% of linuxcnc users. what is the price of your device?

SIR Could you advise how to implement the SSI encoder configuration in hostmot2.py for 901T module compatibility?

How? What did I do wrong ?

I want EtherCAT as an interface.

I forgot to mention I am planning to use Ethercat too. A Beckhoff 5151 encoder interface arrived today. I also have a THCAD10 here which may allow reading of 0-10 volt using it. I will use a Beckhoff 2502 for PWM signal for laser.

You can call an MDI command with a hal pin, that would then be triggered by your button output, by using a Halui MDI.
linuxcnc.org/docs/html/gui/halui.html#_mdi_2

Or if you are programming your user interface, you can program your gui button to issue MDI commands directly, such as with GadeVCP.
linuxcnc.org/docs/html/gui/gladevcp.html...d_action_mdi_widgets

That's the kind of latency I remember from my trusty J1900. Now replaced, but performed very well.

I also built a laser cutting machine based on Linux, I just need a high-precision and fast height sensor. The height needs to be controlled in the range of 0.4 - 25 mm. Do you have a closed project? I wonder what element base it is implemented on? I tried to use ad7745, but it did not show itself very well. I want EtherCAT as an interface.

My project is closed and will be a complete set with my new control system (purely commercial project).

However, I decided to adapt it in a way that it could also be used by other standard systems.

I will reveal the details that I found out on my own and were hard to find on the Internet:

As for AD7745/AD7746, I tried to use it as a controller for gas burners. It was not easy because it worked on the desk, but during cutting, the gas changed the parameters very much and the AD7745/AD7746 measurement method was not suitable.

1. It is not suitable for lasers because the reading is too slow 90Hz.

To make sense for Lasers, the absolute minimum sampling is 500Hz (2ms), I have 3650Hz sampling but I do not want/cannot reveal why this value is chosen and it should be selected for a specific type of processing.
2. AD7745/AD7746 have a measurement range of 17pF (60pF tollerant), which is definitely too little because the parasitic capacitances on the wire, head, etc. are 50-200pF
3. The useful measurement range of the distance is 0.1pF - 30pF, although for some types of nozzles the range may be wider
4. I chose the method of measuring the capacitance charging time, although I also experimented with measuring the frequency as in BCL-AMP + BCS, which was a bit less stable but also very good.
5. Unfortunately, I did not find any ready-made circuit like AD7745/AD7746 that would be suitable, and I had to design everything from scratch.

If you want to use my sensor for 0-25mm, it is possible to use it in MODE 0 (C2V 0-10V) which converts capacitance directly to voltage (it is not calibrated/scaled to a height of 10mm). However, it is very non-linear and as mentioned in the user manual, for such large distances the reading may be inaccurate and unstable. This results from points 2, 3 because at a height of 25mm the share of specific to parasitic capacitance is about 0.1 - 0.2%, which is not easy to read.

proma-elektronika.com/download/c2v_laser_sense_en.pdf

This is my trusty old Gigabyte Brix, 4 gb ram, Linuxcnc 2.94 from the downloads page, all my customisations including the R8168-dkms network driver. Internal wifi card removed and another goodie, an Asus Nano USB Wifi dongle. 8 x GLX gears and some light internet browing including posting this reply.This had latency of  around 130 back when I first used it on Linux MInt 17.3 and now it is mind blowing! 
 

With the help of chatgpt I fixed the expired certificate. But when I update again there is no new version of the kernel. Is this the latest version for my PC. Yesterday it came out with a real-time error again. What should I do?  PS I had to change source.listdeb deb.debian.org/debian bookworm-backports main contrib non-free non-free-firmwaredeb-src deb.debian.org/debian bookworm-backports main contrib non-free non-free-firmwareI now have a new kernel

There seems to be no change in latency