I love the idea of an industrial spec IoT communications system for controlling parts of the machine. Reducing wiring to com+power is really attractive, especially after I spent the weekend building out a 38 wire harness to my experimental machine. Just the cost reduction in wire, connectors, cable management, etc.. make this very worth it.

My problem is finding hardware for the random IO bits I want to add. I have some tool boards on order but those are very specific. Regrettably, there isn't a very good ecosystem of inexpensive CAN-FD transceiver boards out there.

I am looking for something that is a simple, inexpensive CAN-FD transceiver that can be paired with a small SoC like an ESP32, Arduino or whatever. Better yet, a board that has the two integrated together on a small package with a nice array of IO pins and maybe some ADC.

This would be used for specialty sensors or possibly even motor control systems. I have a new filament module that I am working on that measures filament availability, tension and movement rate. It would be good to have a way to communicate this over the CAN-FD bus.

Does Duet have any plans for something like this? Is there a suggested 3rd party board we can use? I feel we have a great technology to play with but we are crippled by a lack of ways to use it.

Note - I would have no issue with deleting this post and starting another with a better focus on the issues I am experiencing if you would like.

The title implies a problem that doesn't exist and that was my fault. I don't want to create a false impression.

@drobertson123 Obviously this is an IQ test for me that I failed. The voltage offset happened because the ground wire on my probe was in the wrong port of the multimeter.
The 24v reference was showing that value because I tuned the power supply using the same multimeter.

The voltages on the board look perfectly fine, just as I would expect from a Duet product.

I still have other issues. CAN-FD will only sync when the cable from the Main Board is on the Dist Board Out port and I can't seem to get the board to do anything. I am going to spend some additional time debugging now that I embarrassed myself publicly with this.

Hopefully, I can sort out the issues.

@Phaedrux Haha, my whole rambling description of my printer was off-topic, so no worries.

Not sure if this will trigger a spam alert, but here is the link to the keyboard.

Wireless Mini Keyboard, GAKOV GAU6 Mini 6-in-1 Smart Gamepad with Touchpad and Remote Control (Black5) (M)

I mainly use it when I am testing the printer inside the cabinet. Otherwise, I just browse to the web page from my big computer 3 ft away. In general, I am pleased with it, but I wouldn't want to use it as my main keyboard.

@Phaedrux Haha, my whole rambling description of my printer was off-topic, so no worries.

Not sure if this will trigger a spam alert, but here is the link to the keyboard.

Wireless Mini Keyboard, GAKOV GAU6 Mini 6-in-1 Smart Gamepad with Touchpad and Remote Control (Black5) (M)

I mainly use it when I am testing the printer inside the cabinet. Otherwise, I just browse to the web page from my big computer 3 ft away. In general, I am pleased with it, but I wouldn't want to use it as my main keyboard.

@dc42 Thank you for that update of the configurator. I worked with it last night and the new options do seem to line up better with what I want to do.

I should have a chance to do some testing later today and will report back on how things go.

I am officially naming this machine the "wassaPrusa" since it is a heavily modified Prusa I3 MK3s. It now has a Hemera hotend joined to the Prusa PINDA v2 Z-Probe. The X & Y axis now have more powerful steppers (and I am also evaluating closed-loop drives). The X-Axis also is being upgraded with a linear rail to fix some sticking issues.

Many of the printed parts are being upgraded to work in a temp controlled enclosure. That enclosure was one of the main drivers for shifting over to the Duet boards. The Prusa printer is great, but it just didn't have the ability to support the expansion I wanted to do.

Now I can control enclosure heaters, fans and other add ons I am working with.

Sorry for rambling about the project. I think I can see the final solution coming for these config issues and it is getting a bit exciting.

Here is the in-progress wassaPrusa;

I am looking for some general advice or to be told it can't be done.

I have a Duet 3 Mainboard that connects over CAN-FD to a Tool Board 1LC running a Hemera. I want to use a PINDA v2 sensor with thermal compensation as my z-axis probe but I keep running into roadblocks.

My initial plan was to connect the PINDA signal line (black) to the io0.in port of the tool board, then wire the temp sensor of the PINDA (white) to temp1, also on the board.

temp0 would be used for the extruder temp and the rest would be a fairly typical setup of fans and extruder stepper.

The problem I keep running into is that io0.in does not seem to be capable of being used as a Z-Probe input. All configuration examples and the configurator seem to want me to plug the PINDA v2 into Temp 0 or 1. If I do this there won't be enough temp ports to support the PINDA temp probe on the tool board.

Does anyone have some advice on this? I would appreciate any guidance.

At this point, I only see two options. The first would be adding wires for a temp sensor all the way back to the Duet 3 mainboard or piggybacking a second tool board 1LC on the extruder. Neither option excites me.

@Phaedrux The perceived voltage issue was a real blocker for me. I am doing some additional debugging now that I am past that.

I don't mind leaving this here as an object lesson for others. My only worry was the title being misconstrued as an indication of poor quality or a problem when it was in no way justified.

I am now trying to sort out the details of getting a PINDA v2 sensor and a Hemera extruder configured on the Tool Board 1LC.

My goal is to eventually have the thermal compensation in the PINDA v2 probe working but let's call that a stretch goal. Now I just need it to act as a basic endstop.

If this gets beyond me I will start a new thread with an appropriate title.

Note - I would have no issue with deleting this post and starting another with a better focus on the issues I am experiencing if you would like.

The title implies a problem that doesn't exist and that was my fault. I don't want to create a false impression.

@drobertson123 Obviously this is an IQ test for me that I failed. The voltage offset happened because the ground wire on my probe was in the wrong port of the multimeter.
The 24v reference was showing that value because I tuned the power supply using the same multimeter.

The voltages on the board look perfectly fine, just as I would expect from a Duet product.

I still have other issues. CAN-FD will only sync when the cable from the Main Board is on the Dist Board Out port and I can't seem to get the board to do anything. I am going to spend some additional time debugging now that I embarrassed myself publicly with this.

Hopefully, I can sort out the issues.

I have a Tool Board 1LC v1.0 that I ordered from Filistruder.

I am having issues with it that make me think it is a defective board but I wanted to check if I am doing anything wrong.

I am connecting the Tool Board through a Tool Distribution Board. The voltage is at a solid 24.1v and nothing seems damaged on the Dist Board or the Tool Board.

The Tool Board CAN-FD will sync with the Duet 3 Mainboard only when the cable is connected to the Distribution Board CAN Out port. A M115 B121 command responds with this;

M115 B121
Board TOOL1LC firmware 3.1.0 (2020-05-15b1)

The Mainboard info is;
Board: Duet 3 MB6HC (MB6HC)
DSF Version: 3.1.1
Firmware: RepRapFirmware for Duet 3 MB6HC 3.1.1 (2020-05-19b2)

The main problem is the voltages across the board are all running significantly low.

The Power input is a solid 24.1v

12v outputs are measuring at 8.33v
5v outputs are 1.745v
3.3v outputs are 0.49v

None of the inputs or outputs seem to do anything and I can’t seem to get any values back or make anything work from the board. These voltages stay stable with or without any equipment connected to the board.

Am I missing some jumper or configuration settings? Is the board just broken?

I would like to get this working and am open to any suggestions you have.

@dc42 Thanks, this is exactly what I needed.

I am working on some tweaks to my Duet 3 6HC Mainboard setup. One issue I have had is that the switching power supply powering the system has enough internal capacitance that it powers the mainboard and the Raspberry Pi for almost a minute after I sure off mains power.

Maybe I am just being paranoid, but I really don't like the slow dropoff of power for the mainboard and SBC.

I am considering leaving the power supply on but having a switch that shuts power off to the Duet 3 Vin and the SBC power. Effectively shutting off the system.

The issue comes from finding a switch that can also handle the current I am using for the bed heater. Without that item in the mix, I have some great illuminated switched that would work great. But none of them will also handle the bed current that I am supplying separately.

My question is if leaving the High Current Input powered while shutting off the Vin will damage the board in any way. Will it end up powering the board somehow? Is it going to damage any of the high current control circuits? I am hoping to just be able to leave the high current Input unmanaged but before I go this route I want to be sure I won't damage anything.

If needed I can set up a relay that turns on when the board power comes on. This would allow me to shut down the High Current supply at the same time as Vin, but it is more parts and effort.

Any suggestions would be welcome.

Thanks for the information and good luck with the current challenges. It is easier to wait when I have a clear idea of what is going on.

Is there a place to watch for updates on this?