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NOT can found, no have, only can use paraller port hat and paraller port breakoutboard, if want rpi use stepper drive direct need voltage level shifter board, 3,3V to 5V 8 pin converter, rpi use 3,3V and convert output can use 5V stuff, etc, stepper motor driver, step and dir pin, and enable pin. and same can bi -directional board use input too 5V sensors,limitSW etc convert to 3,3V and use whit rpi. same output relays etc, cn use gpio pin 3,3V convert to 5V and then use trnsistor who connect to relay on/off relay. gpio not handle lot current about 2mA out and in little more, or burn input/output port. thats why need converter and optocoupler to input current resistor need too, stuff not broken rpi. and shift level converter and resistor output no burn output pin, if have lot money waste buy ower price protoneer rpi cnc shield 100€ horriple price, or cheapen option rpi paraller port hat 35€ and cheap chinese 10€ breakoutboard. i think have possiple use shift level converter to input/output gpio pins and optocoupler cheap in-out system direct to driver and all limit,home,probe,etc inputs, opto input pins and shift level converter output pins, i hope working , i need test if has order all parts, but i not understand what software need do, image were is linuxcnc and how working whit paraller port hat if use, or what need hal file doing or other, programs and code not my job ,not understand anything.

That really depends on use case, sometimes both sides must be used, sometimes only one side.
I really do not think i can do a god job of explaining that, so i'll shut up.

Thanks for correcting the comment re grounds terminated at one end only. I was concerned connecting at both may create a ground loops.
Its nice to be corrected and learn better ways.

unknown wrote:

Thanks Tommy ...

You are absolutely welcomed, always.

Well, to late, but no need for any of that fuss.
We need as much info as possible for the machine, motors, drives, controllers, whatever else, and a lot of pictures of the wiring and setup.
From you picture it seems like brushed servo motors, but i can not see if they have tachos, if they do that would make them analog servo, if not then most probably position controlled with probably step/dir signals or if older with up/down control or plain quadrature.
See, to much assumptions, so more pictures.
For analog servo, you can use this howto and with a bit of time and effort have the machine tuned pretty fast:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to
The link above will not work for any other type of control, only analog with Mesa boards, although it works with other controllers also.

5 phase steppers are tough, i have plenty, i use none.
Get some cheap steppers and some really cheap drives like the TB6600 (that despite the name use TB67S109 chip inside), an old PC with a parallel port or a new-ish PC with a parallel port add on card, wire, install LinuxCNC and start making chips.
Later you can think about getting a Mesa board as it is much, much faster than parallel port, so you can use more microstepping on the drives and subsequently the machine will have less vibrations and move faster, but it is a mill so noise is not important.

This is it, but it is very long:
forum.linuxcnc.org/18-computer/42276-rem...rocontroller-via-spi

What does "erratic behavior" mean, exactly and how does it show up?

With an older 4B you may need to upgrade the firmware for things to stick when installing the image.. I had this problem.

Ribbon cable with every second conductor a ground terminated at one end only, of course you will need a dedicated return

I would suggest the same with the grounds connected at both ends.

Ground bumping and  ground impedance for external HF currents from external noise sources
is a real issue for high speed single ended signaling, so the more ground connections between
the RPI and the UC, the better...

That depends on the resolution of the A/D converter. I believe the ones on the 7i43 board are 1024, regardless of the value being converted; the values ​​will range from 0 to 1024. You can check with HAL and analyze the values ​​that the A/D converters on your card are taking.

Honestly I work in technical spaces and I’m lucky to have the means to support companies that do this kind of work, and I’m happy to pay Mesa for their cards, given how much support they offer. I will return cards for RMA, and I don’t mind having spares.

Doing this build has been much more enjoyable than I expected so I figure I’ll probably also build an CNC lathe or convert my plasmacutter to Mesa control at some point. 

I appreciate the offer of a parallel card so I could boot my existing board but I’ll be able to check with the new control board that is coming and work is gonna consume me until those cards show up anyways

I have a skr1.4 turbo board. Would like to use ethernet to connect it to a pc instead of using a Raspberry Pi. Did see the demo of it working. Searched through the threads here and couldn't find how to wire and configure it.

I'm looking for a 4th Axis. Any links to a half decent quality 4th axis would be appreciated, I'm using pathpilot on a Novakon Pulsar mill so only light milling..

I recently struggled with getting my Raspberry Pi 5 to accept the estop input. On this forum, I asked the following question. 
I would like to know how to connect the GPIO to LinuxCNC’s E-Stop chain.
From this, I received some tips and advice that pointed me in the right direction, but no working answers. I used a YouTube video on installing LinuxCNC on a Raspberry Pi, but the advice was old and no longer valid. My assessment at this time is: If someone were to attempt what I attempted, I don't see a mechanism for them to follow in my footsteps because they would unlikely use the search term "estop" or "GPIO" to search the forum. So I would like to put together what I learned to make this happen. 
1. Not many users of this form are using Raspberry Pi computers - they have some limitations
2. The Byte2Bot hat does not create a parallel port. Rather is isolates the GPIO pins on the computer board and brings them out using a DB25 connector that is just like the parallel port on your Mesa card or computer. This allows you to use a parallel port breakout board. While a parallel port dedicates PIN2 to a dataline, with the output from a Raspberry Pi, one needs to refer to what is the GPIO line connected to that pin which is GPIO9 in this example. In your setup, you cannot refer to PIN2; you must only refer to which GPIO line it is. When someone sends you suggestions that look like  "=> hal-gpio.PIN12.out" - it won't help you. 
3. There are folks who can help you. The most valuable was the user "unkown". unknown provided this:
Below is a thread that is more or less an index for the Main RPi4/5 thread.
forum.linuxcnc.org/38-general-linuxcnc-q...l-images-only#325007
Has a section regarding GPIO and there is a working config if you follow the links.
They are there, you just have to look.
Just about everything regarding the Rpi4/5 is in this thread
forum.linuxcnc.org/9-installing-linuxcnc...official-images-only
4. The schematic offered by Byte2Bot had some notable omissions that is corrected in the Circuit3.jpg schematic from another user.
5. The eStop button should be NC (Normally Closed) - I did not correct that. The eStop button should be latching - mine is not. 
6. The *.hal file has changed significantly since the requirement of using the GPIO nomenclature
7. I have yet to control the spindle speed with the breakout board.
8. The StepConfig package in LinuxCNC is not intended for a Raspberry Pi with a hat. It is designed for a MESA board setup, which this is not. I'm not aware of a reason to use it, but it does create a *.hal and *.ini file for the machine name you select in setup.
9. If you want to search Google about eStop, do not search "Linuxcnc estop". You will fail. However, if you add the word "latch" to your query, you will have success. Don't ask. If you have a ton of experience, it may make sense. 
10.  When you submit a topic, hit the submit button and go have lunch. Nothing may happen for a while. I became impatient and hit submit again, and two instances of my topic were submitted. 11. How your question looks in the editor may not be how it looks online.12. I have more to learn.

SO
What do I have to promote the cause? If you use a Raspberry Pi 5 with a Byte2Bot parallel hat (it should be called a DB25 hat) with a parallel breakout board, you may have success with the following wiring and code.