diff --git a/CanHat.jpg b/CanHat.jpg new file mode 100644 index 0000000..fe11919 Binary files /dev/null and b/CanHat.jpg differ diff --git a/PCB/CanHat/CanHat.sch b/PCB/CanHat/CanHat.sch index 031d104..60c15f1 100644 --- a/PCB/CanHat/CanHat.sch +++ b/PCB/CanHat/CanHat.sch @@ -717,4 +717,6 @@ F 3 "~" H 6250 2000 50 0001 C CNN 1 6250 2000 0 -1 -1 0 $EndComp +Text Notes 8000 2350 0 50 ~ 0 +TODO: \nAdd decoupling caps\nAdd jumper for terminator\nAdd connectors for power regulator for the PI\nPower connectors point up, not angled\nFuses for each power\nPins for RX/TX direct to tranciever $EndSCHEMATC diff --git a/README.md b/README.md index e0cdb49..e73a740 100644 --- a/README.md +++ b/README.md @@ -47,8 +47,13 @@ After a lot of software work and many hours of testing I can report that everyth * The thermistor input gives a very low noise signal, even at high temperatures. * Endstop works * All mosfet outputs works with reasonable loads (2A at 24V). I do not have a dummy load for very high load testing, but a heater on the FAN connectors and a hotbed to the heater connector... -* The thermals of the TMC2209 seems ok. With no cooling fins or active cooling it reaches 60C (top and bottom) when mounted close to a hot stepper. I should test with a larger stepper (>1.5A) in a hotter environment to see when the TMC shuts down. +* The thermals of the TMC2209 seems ok. With no cooling fins or active cooling it reaches 60C (top and bottom) when mounted close to a hot stepper. I should test with a larger stepper (>1.5A) in a hotter environment to see when the TMC shuts down. I am considering a different fab that allows thicker copper layers for better heat spead, and better power margins. * The CAN bus works good after some software work. It should work fine with up to 8 nodes on each bus, possibly more. I have run 4 boards on the same bus, each with one stepper, simulating a complete 3D printer. -It is possible to fit different connectors for most functions. It is designed for mostly angled JST-XH or screw terminals but it's possible to find straight connectors or other 2.54mm for most functions. JLCPCB do not mount through holes so the boards come without connectors. +It is possible to fit different connectors for most functions. It is designed for mostly angled JST-XH or screw terminals but it's possible to fit straight connectors or other 2.54mm for most functions. JLCPCB do not mount through holes so the boards come without connectors. +For a larger (>30) production run the boards would have to be panellized, which looks like a non-trivial task with KiCAD. If anyone has experience and wants to help ... + + +![Can Hat](CanHat.jpg) +As a sub project to this board I have developed a little power and CAN distribution board combined with an STM2515 CAN bus controller in the form of a Raspberry Pi Hat. It is a very simple little board but has turned out to be very valuable. With some more thought put into it I think it will be a good complement to the Huvud tool board. It has to be modified to allow it to be used separate from a Pi with a different CAN controller. It also needs some fuses, a proper isolated CAN tranciever, more flexibility for the CAN termination and connectivity. A an option to fit a voltage regulator to power the Pi from the boards power. And mosfets to power down the boards ... feature creep...