BIG TREE TECH EBB42 CAN User manual

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BIGTREETECH
EBB42 CAN V1.0
User Manual

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Contents
Contents................................................................................................................................................ 2
Revisions............................................................................................................................................... 3
Ⅰ. Brief Instruction............................................................................................................................. 4
1.1 Features.................................................................................................................................. 4
1.2 Parameters............................................................................................................................. 5
1. External Dimensions: 40mm x 40mm. For further details please read: BIGTREETECH
EBB36 CAN V1.0-SIZE.pdf........................................................................................................ 5
4. Input Voltage: DC12V-DC24V 9A........................................................................................... 5
5. Logic Voltage: DC 3.3V............................................................................................................ 5
6. Heating Interface: Heating Rod (E0), maximum output current: 5A.................................. 5
7. Onboard Sensor:ADXL345..................................................................................................... 5
8. Fan Interfaces: Two CNC Fans (FAN0, FAN1)..................................................................... 5
9. Maximum Output Current of Fan Interface: 1A, peak value 1.5A...................................... 5
10. Expansion Interfaces: EndStop, I2C, Probe, RGB, PT100/PT1000, USB Interface,
CAN Interface ................................................................................................................................ 5
11. Motor Drive: Onboard TMC2209.......................................................................................... 5
12. Driver Working Mode: UART................................................................................................. 5
13. Stepper Motor Interface: EM................................................................................................. 5
14. Temperature Sensor Interface(Optional): 1 channel 100K NTC or PT1000 (TH0), 1
channel PT100/PT1000................................................................................................................ 5
15. USB Communication Interface: USB-Type-C..................................................................... 5
16. DCDC 5V Maximum Output Current: 1A............................................................................. 5
1.3 Firmware................................................................................................................................. 5
1.4 Size Diagram.......................................................................................................................... 6
II. Peripheral interface........................................................................................................................ 7
2.1 Pin............................................................................................................................................. 7
III. Introduction of Interface.............................................................................................................. 8
3.1 USB Power Supply............................................................................................................... 8
3.2 100K NTC or PT1000 Settings........................................................................................... 8
3.3 Connection with BL-Touch............................................................................................... 10
3.4 Connection with Filament Broke Detection................................................................. 11
3.5 Connection with RGB........................................................................................................ 11
IV. Klipper............................................................................................................................................ 12
4.1 Compile Firmware.............................................................................................................. 12
4.2 Update Firmware................................................................................................................. 13
4.3 CANBus Configuration...................................................................................................... 15
4.3.1 Use with BIGTREETECH U2C Module................................................................ 15
4.3.2 Use with BIGTREETECH RPI-CAN HAT Module.............................................. 16
4.4 Klipper Configuration........................................................................................................ 18
V. Cautions.......................................................................................................................................... 19
VI. FAQ ................................................................................................................................................. 19

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Revisions
Version
Statements
Date
01.00
First Draft
2022/04/18

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Ⅰ. Brief Instruction
BIGTREETECH EBB42 CAN V1.0 is a nozzle adapter board specially designed
for the 42 extruder stepper motor, which is launched by the 3D printing team
Shenzhen Big Tree Technology Co., Ltd. It can communicate via USB port, or
CAN BUS, greatly simplifying wirings.
1.1 Features
1. With BOOT and RESET buttons reserved, users can update the firmware via
DFU mode by USB.
2. Added protection circuit on the thermistor avoids burning the main control chip
caused by leakage current from the heating rod.
3. User can select the thermistor's pull-up resistors values through jumper wire, so
as to support PT1000 (2.2K pull-up resistors), which makes it convenient for DIY.
4. Connect the USB with a jumper cap to get it power on, which effectively isolates
the main control board DC-DC from USB 5V.
5. Reserved I2C interface allows for filament broke and clogged detection, and
supports other DIY functions.
6. Added anti-flyback diodes on the heating rod and fans' ports effectively protect
the MOS tube from being burned due to reverse voltage.
7. Anti-reverse connection protection on the power interface prevents users from
burning the motherboard when mistakenly connecting the reverse power line during
DIY.
8. Onboard MAX31865 supports selecting 2-wire or 4-wire of PT100/ PT1000.
9. Supports communication via CAN or USB. The terminal resistor 120R of CAN
can be selected through the jumper cap, and it reserves CANexpansion interfaces.
10. Equipped ESD protection chip on the USB port prevents the main control board
from being broken down by the static electricity of the USB port.
11. The adaptor board is equipped with terminals, female reeds, double-way studs
and screws, which are required accessories for DIY, greatly meeting the DIY needs
of customers.

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1.2 Parameters
1. External Dimensions: 40mm x 40mm. For further details please read:
BIGTREETECH EBB42 CAN V1.0-SIZE.pdf
2. Installation Dimensions: Hole spacing 31mm x 31mm, M3 screw hole x 4
3. Microprocessor: ARM Cortex-M0 STM32F072C8T6 48MHz
4. Input Voltage: DC12V-DC24V 9A
5. Logic Voltage: DC 3.3V
6. Heating Interface: Heating Rod (E0), maximum output current: 5A
7. Onboard Sensor: ADXL345
8. Fan Interfaces: Two CNC Fans (FAN0, FAN1)
9. Maximum Output Current of Fan Interface: 1A, peak value 1.5A
10. Expansion Interfaces: EndStop, I2C, Probe, RGB, PT100/PT1000, USB
Interface, CAN Interface
11. Motor Drive: Onboard TMC2209
12. Driver Working Mode: UART
13. Stepper Motor Interface: EM
14. Temperature SensorInterface(Optional): 1 channel 100K NTC or PT1000 (TH0),
1 channel PT100/PT1000
15. USB Communication Interface: USB-Type-C
16. DCDC 5V Maximum Output Current: 1A
1.3 Firmware
BTT EEB42 CAN V1.0 only supports Klipper at the present.

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1.4 Size Diagram

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II. Peripheral interface
2.1 Pin

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III. Introduction of Interface
3.1 USB Power Supply
D1 RGB light will be on when the control board is powers on, which shows
supplying normal power. VUSB in the middle of the board is the selection terminal
for power. Only when USB supplies power to the board, or the board supplies
power through USB, users need to short circuit the VUSB by jump cap.
3.2 100K NTC or PT1000 Settings
1. Version without 31865:No need to insert a jumper cap when using a 100K NTC
thermistor, and TH0's pull-up resistor value is 4.7K. When using PT1000, you
need to use the jumper cap to short the two pins circled in red as shown below.
At this time, TH0's pull-up resistor value is 2.2K (Notice: the temperature
accuracy that's read out this way will be less accurate than that of MAX31865).

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2. Version with 31865: Select PT100/PT1000 by DIP switch, two-line or four-wire.
1
2
3
4
Sensor Model
ON
ON
ON
OFF
Two lines PT100
ON
ON
OFF
ON
Two linesPT1000
OFF
OFF
ON
OFF
Four-wire PT100
OFF
OFF
OFF
ON
Four-wire PT1000

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3.3 Connection with BL-Touch

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3.4 Connection with Filament Broke Detection
3.5 Connection with RGB

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IV. Klipper
4.1 Compile Firmware
1. After connecting to the Raspberry Pi via ssh, type the below sentences at the
command line:
cd ~/klipper/
make menuconfig
Compile the firmware with the following configuration (if the following options
are not available, please update the Klipper firmware source to the latest
version)
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32F072) --->
Bootloader offset (No bootloader) --->
Clock Reference (8 MHz crystal) --->
If using USB communication over Type-C
Communication interface (USB (on PA11/PA12)) --->
If using CANBus communication
Communication interface (CAN bus (on PB8/PB9)) --->
(250000) CAN bus speed
2. When completed the configuration selection, type 'q' to exit the configuration
interface. Select "Yes" when asked whether to save the configuration.
3. Enter make to compile firmware. The 'klipper.bin' firmware that we need will be
generated on the home/pi/kliiper/out folder of the Raspberry Pi only once
completed make. On the left side of ssh software, user can download the
'klipper.bin' firmware directly to the computer.

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4.2 Update Firmware
Update firmware via Raspberry Pi (You can also update via
STM32CubeProgrammer software after the board is plugged into the computer
and entering DFU mode).
1. Press on the Boot button, then click on the Reset button to enter DFU mode.

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2. Type lsusb in the ssh terminal command line to query the ID of the DFU device.
3. Type make flash FLASH_DEVICE=0483:df11 to download the firmware (Notice:
Replace 0483:df11 with the actual ID of the DFU device queried in the previous
step).
4. Type ls /dev/serial/by-id/ to query about the serial IDof the device when finished
downloading the firmware (The serial ID will only exist when communicating via
USB. Ignore this step when communicating via CAN Bus).

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5. After downloading the firmware for the first time, there's no need to press on
Boot and Reset button again to enter DFU mode when updating the firmware
again. User can type
make flash FLASH_DEVICE= /dev/serial/by-id/usb-
Klipper_stm32f072xb_28002D001557434338313020-if00
to download the firmware(Notice: Replace /dev/serial/by-id/xxx with actual ID
queried in the previous step)
4.3 CANBus Configuration
4.3.1 Use with BIGTREETECH U2C Module
1. Type the following command sudo nano /etc/network/interfaces.d/can0 in the

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ssh terminal and execute
auto can0
iface can0 can static
bitrate 250000
up ifconfig $IFACE txqueuelen 1024
Set the speed for CANBus at 250K(which must be the same as the speed set
in the firmware (250000) CAN bus speed), Save (Ctrl + S) after modification
and exit (Ctrl + X).Type command sudo reboot to reboot Raspberry Pi.
2. Every device on CANBus will generate a canbus_uuid based on MCU's ID. If
users want to find the ID for every microcontroller, please make sure the
hardware is powered on and wired correctly, then run the following command:
~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
3. If detected an uninitialized CAN device, the above command will report the
device's canbus_uuid:
Found canbus_uuid=0e0d81e4210c
4. If Klipper operates normally and is connected to the device, then it won't report
canbus_uuid, which is normal.
4.3.2 Use with BIGTREETECH RPI-CAN HAT Module
1. Type and run the following command sudo nano /boot/config.txt, and added
below contents on file config.txt.
dtparam=spi=on
dtoverlay=mcp2515-
can0,oscillator=12000000,interrupt=25,spimaxfrequency=1000000
After modification, save(Ctrl + S)and exist(Ctrl + X), type sudo reboot to reboot
Raspberry Pi.
2. Type and run commands dmesg | grep -i '\(can\|spi\)' to test if RPI-CAN HAT

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module is normally connected.The normal response should be as below:
[ 8.680446] CAN device driver interface
[ 8.697558] mcp251x spi0.0 can0: MCP2515 successfully initialized.
[ 9.482332] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes
ready
3. Type sudo nano /etc/network/interfaces.d/can0 on the ssh terminal and run the
command.
auto can0
iface can0 can static
bitrate 250000
up ifconfig $IFACE txqueuelen 1024
Set the speed for CANBus at 250K(which must be the same as the speed set
in the firmware (250000) CAN bus speed). Save (Ctrl + S) after modification
and exit (Ctrl + X). Type command sudo reboot to reboot Raspberry Pi.
4. Every device on CANBus will generate a canbus_uuid base on MCU's ID. If
users want to find ID for every microcontroller, please make sure the hardware
is powered on and wired correctly, then run the following command:
~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
5. If detected an uninitialized CAN device, the above command will report the
device's canbus_uuid:
Found canbus_uuid=0e0d81e4210c
6. If Klipper operates normally and is connected to the device, then it won't report
the canbus_uuidm, which is normal.

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4.4 Klipper Configuration
1. Enter Raspberry Pi's IP address in a browser to access the page as shown
below picture, and download the reference configuration of the motherboard. If
you cannot find this file, please update the Klipper firmware source code to the
latest version, or download it from github
https://github.com/bigtreetech/EBB
2. Upload the board's configuration files to the Configuration files as shown below.
3. Add the board's configuration to the file“printer.cfg".
[include sample-bigtreetech-ebb-canbus-v1.0.cfg]
4. Revise the ID number of the configuration files as the actual ID of the board
( Via USB serial or CANBus).
5. Configure the specific functions of modules as instructed below:

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https://www.klipper3d.org/Overview.html
V. Cautions
1. When the TH0 interface doesn't use PT1000, you can't insert the jump cap on
it, otherwise 100K NTC won't be used as normal.
2. When using CAN communication, you need to see whether it is used as a
terminal. If it is, you must insert the jumper cap on the 120R position.
3. When DIY crimping, you need to pay attention to the line sequences, and do
DIY according to the Pin diagram so as to avoid the power line from being
reversely connected or connected to the CAN signal, which will get the module
burned.
4. If there's no external power supply during writing firmware via USB port, you
need to short the VUSB by jumper cap so as to supply the module with working
voltage.
5. The load current of the heating rod and the fan interfaces shall not exceed the
maximum withstand current to prevent the MOS tube from being burned out.
VI. FAQ
Q: What's the maximum current for the heating rod and fan interface?
A: The maximum output current of the heating rod port: 5A.
The maximum output current of the fan interface: 1A, peak value 1.5A.
The total current for the heating rod, stepper driver and fans needs to be less than
9A.
Q: Cannot update firmware via USB port?
A: You need to make sure that the jump cap is inserted on VUSB, and the
indicator light on the board is on.