docs
This commit is contained in:
Pontus Borg
parent
afefc4f173
commit
71d8ff7ff2
BIN
Board.jpg
BIN
Board.jpg
Binary file not shown.
|
Before Width: | Height: | Size: 130 KiB After Width: | Height: | Size: 392 KiB |
35
README.md
35
README.md
@ -4,29 +4,23 @@ A very small 3D printer board for use on a toolhead. It is designed to be used w
|
||||
|
||||
|
||||
Features:
|
||||
* TMC2209 driver
|
||||
* STM32F042C6T6
|
||||
* TMC2209 stepper driver
|
||||
* STM32F103 72Mhz MCU
|
||||
* Two MOSFET drivers fans
|
||||
* One bigger MOSFET driver for a hotend heater
|
||||
* Thermistor input
|
||||
* One endstop
|
||||
* CAN bus
|
||||
* USB
|
||||
|
||||
Main power is 12-24V. 24V is preferred to keep the currents low
|
||||
|
||||
The CAN Bus is not terminated, instead it uses 4 wires, termination should be done at the other end.
|
||||
All done in KiCad and open source.
|
||||
|
||||
It uses an external 3.3V switch regulator.
|
||||
|
||||
All done in KiCad
|
||||
|
||||
Possible issues:
|
||||
|
||||
* Is the cooling for the TMC2209 adequate? Seems to be, the board reaches about 50C under the TMC2209 when running a small stepper at 1A.
|
||||
|
||||
Change ideas:
|
||||
|
||||
Is the endstop useful? Could be used as a filament runout sensor.
|
||||
* Find a better heater mosfet, our 3.3V Vgs is on the low side for that chip.
|
||||
|
||||
---
|
||||
|
||||
@ -36,17 +30,17 @@ First prototype production run is done.
|
||||
|
||||
|
||||
|
||||
The board works mostly as intended. Some quick tests shows that the MCU can run klippy, stepper drivers, fan drivers and thermistors works perfectly fine.
|
||||
They work!
|
||||
|
||||
2020-05-29:
|
||||
|
||||
|
||||
|
||||
After a lot of software work and many hours of testing I can report that everything actually works as intended (except one resistor that should have been 1k was a 10k)
|
||||
After a lot of software work and many hours of testing I can report that everything actually works as intended (except one resistor that was a 10k insteadof 1k)
|
||||
|
||||
* 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...
|
||||
* All mosfet outputs works with reasonable loads (2A at 24V). I do not have a dummy load for 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. 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.
|
||||
|
||||
@ -54,6 +48,15 @@ It is possible to fit different connectors for most functions. It is designed fo
|
||||
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 ...
|
||||
|
||||
|
||||
|
||||
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...
|
||||
2020-06-04:
|
||||
|
||||
Version 0.4 in the works...
|
||||
|
||||
|
||||
# Can Hat
|
||||
|
||||
|
||||
As a sub project to this board I have developed a little power and CAN distribution board combined with an MCP2515 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.
|
||||
|
||||
|
||||
Binary file not shown.
|
Before Width: | Height: | Size: 111 KiB After Width: | Height: | Size: 274 KiB |
@ -5,7 +5,7 @@
|
||||
|
||||
[mcu head0]
|
||||
serial: /tmp/ttyCAN3
|
||||
|
||||
restart_method = command
|
||||
|
||||
[extruder]
|
||||
step_pin: head0:PB3
|
||||
@ -39,3 +39,5 @@ heater_temp: 50.0
|
||||
[fan]
|
||||
pin: head0:PA7 # "FAN0"
|
||||
|
||||
|
||||
# endstop_pin = head0:PA1 "ENDSTOP", active low
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user