Comments (7)
You found a way. It's improved now
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Klipper screamed to get a board like this, the design of klipper makes it very easy. A multi head printer needs a product like this.
I'm stuck in a horrible world of SMT assembly and manufacture at the moment. With some luck there will be some working boards for sale at the end of the summer.
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Where are all the EEs when you need them? Hidden in some corporate basement!
The current CAN implementation tunnels serial over CAN, far from ideal but it gets the job done. Each board gets its own virtual serial port. Not very different from how USB serial does it.
We could make a better implementation that integrates better with how the klipper serial protocol works. But it works as is, I can't see any major issues with it. It currently has a separate daemon that does the CAN work (https://github.com/Delsian/CanSerial) that could be a part of klippy.
Klipper is very light on serial use and is quite latency and error tolerant. Each board uses peek ~30 kbits/s. I can easily run all my 5 prototypes on one 500kbit/s bus. I estimate that for a stable system you should not use more than 8 per 500kbit/s CAN bus. But you can have many busses per host (The CAN hats for the PI's are horrible for scaling, it's better to use USB dongles).
CAN, being a bus, makes it possible to sniff, analyze and inject traffic on the bus. As it is a strict priority bus it's easy to fill it to 75% with high prio junk trafic, or flood it with low prio traffic. I have had a lot of fun :)
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Related Issues (20)
- Minimal components for just stepper motor control? HOT 2
- Inductive probe? HOT 5
- Availability? HOT 2
- USB details HOT 2
- Termination resistor HOT 2
- Can use RP2040? HOT 2
- Update buy links and photo in README for 0.61
- Questions: Alternate TMC driver setup HOT 2
- Question: Endstop Header VCC
- Thermister accuracy at low temperatures ( E3D V6 ) HOT 8
- Waveshare RS485 + Pi Zero W 2 HOT 1
- Can't flash Huvud 0.61 HOT 4
- Klippy shutdown: Timeout on wait for 'tmcuart_response' HOT 5
- How do you connect the StealthBurner LEDs to Huvud 0.61? HOT 1
- STEP file of board assembly HOT 2
- 3 axis version
- POS files for v0.62 not correct HOT 2
- Future design iteration suggestion - Angled Pin Header
- Timeout on wait for 'tmcuart_response' response
- Steps required to restore a damaged bootloader HOT 2
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