BIG TREE TECH EBB36 CAN V1.1 User manual

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BIGTREETECH
EBB36 CAN V1.1
User Manual

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Contents
Contents.....................................................................2
Revision History .............................................................3
1 Product Introduction ........................................................4
1.1 Product Features......................................................4
1.2 Product Parameters ...................................................5
1.3 Firmware Support .....................................................5
1.4 Product Size ..........................................................6
2 Peripheral Interface .........................................................7
2.1 Pin Instruction ........................................................7
3 Introduction of Interface.....................................................8
3.1 USB Power Supply ....................................................8
3.2 100K NTC or PT1000 Settings ..........................................9
3.3 BL-Touch Wiring .....................................................11
3.4 Filament Runout Detection Wiring .....................................11
3.5 RGB Wiring..........................................................12
4 Klipper....................................................................13
4.1 Firmware Compilation ................................................13
4.2 Firmware Update.....................................................14
4.3 CANBus Configuration ...............................................18
4.3.1 Work with BIGTREETECH U2C ..................................18
4.3.2 Work with BIGTREETECH RPI-CAN HAT..........................19
4.4 Klipper Configuration ................................................20
5 Cautions ..................................................................21
6 FAQ ......................................................................22

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Revision History
Revision
Description
Date
01.00
First Draft
2022/05/16
01.01
Correct the wrong mark of
the heater cartridge port on
the pin diagram.
2022/05/21
01.02
Add precautions for hotend
when DFU updates firmware
2022/05/25
01.03
More detailed pin Instruction
2022/06/16

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1 Product Introduction
BIGTREETECH EBB36 CAN V1.1 is a nozzle adapter board made by the 3D
printing team of Shenzhen BIQU Technology Co., Ltd. for a 36 stepper motor
extruder. It can communicate via a USB or CAN, which greatly simplifies wiring.
1.1 Product Features
1. With a BOOT and RESET buttons reserved, users can update the firmware
via DFU mode by USB.
2. Adding a protection circuit on the thermistor avoids burning the main control
chip caused by electric leakage of the heater cartridge.
3. The thermistor can select the pull-up resistor value via a jumper, in this way, it
can support PT1000 (2.2K pull-up resistor), which is convenient for DIY.
4. The USB power is selected through a jumper cap, which effectively isolates
the motherboard DC-DC and USB 5V.
5. Reserve the I2C interface, this interface can also be used for filament
runout/blocking detection, or DIY for other functions.
6. A follow current diodes are added to the inductive load interface (fan) to
ensure that when the fan MOS is turned off, the fan winding current has a
follow current loop, which effectively prevents the high voltage generated by
the winding drain at the MOS tube when it is turned off. Considering the size
of the board and the switch characteristics of the extruder fan, a Schottky
diode in a SOD-323 package is used.
7. The DCDC step-down circuit is reversely connected to a diode to prevent the
subsequent circuit from being damaged due to the reverse connection of the
power line.
8. Onboard MAX31865 (optional function, the version without 31865 does not
have this function, but there are reserved pads), supports 2-wire/4-wire
PT100/PT1000 selection.
9. Support communication via CAN or USB. The terminal resistor 120R of CAN
can be selected through a jumper cap, and it reserves a CAN expansion
interface.
10. Equipping the ESD protection chip on the USB port prevents the main control
from being broken down by the static electricity of the USB port.
11. Limit switch hardware debouncing circuit.

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12. The adaptor board is equipped with terminals, female reeds, double-way
studs and screws, which are required for DIY, greatly meeting the DIY needs
of customers.
13. Support CAN bus connection, which has long data transmission, strong anti-
noise ability, strong real-time performance and high reliability.
1.2 Product Parameters
1. Product Size: 51.5 x 37mm, for further details please read: BIGTREETECH
EBB36 CAN V1.1-SIZE.pdf
2. Installation Dimensions: Hole Spacing 43.85mm, M3 Screw Hole x 2
3. Microprocessor: ARM Cortex-M0+ STM32G0B1CBT6 64MHz
4. Input Voltage: DC12V-DC24V 6A
5. Logic Voltage: DC 3.3V
6. Heating Interface: Heater Cartridge (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
10. Expansion Interfaces: EndStop, I2C, Probe, RGB, PT100/PT1000, USB
Interface, CAN Interface
11. Motor Drive: Onboard TMC2209, Hardware Address: 00, Rsense: 0.11R
12. Driver Working Mode: UART
13. Stepper Motor Interface: E
14. Temperature Sensor Interface Optional: One for 100K NTC or PT1000(TH0),
one for PT100/PT1000
15. USB Communication Interface: USB-Type-C
16. DC-DC 5V Maximum Output Current: 1A
1.3 Firmware Support
This product currently only supports Klipper.

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1.4 Product Size

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2 Peripheral Interface
2.1 Pin Instruction

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3 Introduction of Interface
3.1 USB Power Supply
After the motherboard is powered on, the yellow-green LED1 lights will light up,
indicating a normal power supply. The VUSB on the right side of the board is the
power selection terminal. Only when using USB to supply power to the
motherboard or need to supply power through USB, do you need to use the
jumper cap to connect VUSB.

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3.2 100K NTC or PT1000 Settings
1. Version without 31865: No need to plug 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, as shown below picture. 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).
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 lines PT1000
OFF
OFF
ON
OFF
Four-wire PT100
OFF
OFF
OFF
ON
Four-wire PT1000

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3.3 BL-Touch Wiring
3.4 Filament Runout Detection Wiring
PB3

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3.5 RGB Wiring
RGB

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4 Klipper
4.1 Firmware Compilation
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 source to the latest version).
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32G0B1) --->
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 PB0/PB1)) --->
(250000) CAN bus speed
Note: Only after https://github.com/Klipper3d/klipper/pull/5488is merged into
the main branch of Klipper, will the official firmware support the CAN bus
function of STM32G0B1. If you use CANBus communication, you can use the
firmware_canbus.bin compiled by us on our GitHub, or use our source code
to compile it yourself: https://github.com/bigtreetech/klipper/tree/stm32g0b1-
canbus
2. When the configuration is completed, type 'q' to exit the configuration
interface. Select "Yes" when asked whether to save the configuration

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3. Enter make to compile the firmware. The 'klipper.bin' firmware that we need
will be generated on the home/pi/klipper/out folder of the Raspberry Pi when
completed. The firmware is on the left side of SSH software, users can
download it directly to the computer.
4.2 Firmware Update
Warning：STM32G0B1CB needs to jump to the System memory area to run
bootloader (written by STMicroelectronics) when using DFU to update firmware
through the Type-C port. Referring to the description in manual AN2606
(https://www.st.com/content/ccc/resource/technical/document/application_note/b9
/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translati
ons/en.CD00167594.pdf), The initialization process of this bootloader is shown in
the following figure:
,
The IO of USART will be configured before going to the USB DFU mode.

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After going to DFU mode, PA2 will be configured to output high level by
bootloader in System memory area refer to the datasheet of STM32G0B1CB
(https://www.st.com/resource/en/datasheet/stm32g0b1cb.pdf)
PA2 is used for the hotend MOSFET in EBB36 CAN V1.1 and EBB42 CAN V1.1,
The high level in the DFU mode change the hotend into heating state. Therefore,
please pay attention to disconnect the main power VIN of the hotend when using
the DFU of Type-C port to update the firmware, or ensure that the firmware
update is completed soon and goto the normal working mode. Never keep MCU
in DFU mode for a long time when the main power supply and hotend are
connected.
Upgrade with STM32CubeProgrammer
1. Open the installed STM32CubeProgrammer and select the firmware to
download (klipper.bin).

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2. Press and hold the Boot button, then click the RST button to enter DFU mode.
3. Click the "Refresh" button in the STM32CubeProgrammer until the Port
changes from "No DFU d..." to "USB1", then click "Connect" to connect the chip.

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4. After the connection is successful, "Connect" will change into "Disconnect", and
then click "Download", after the download is completed, a pop-up window of "File
download complete" will appear, indicating that the burning is successful.

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4.3 CANBus Configuration
4.3.1 Work with BIGTREETECH U2C
1. Type the following command sudo nano /etc/network/interfaces.d/can0 in the
SSH terminal and execute:
auto can0
iface can0 can static
bitrate 250000
up ifconfig $IFACE txqueuelen 1024
Set the speed for CANBus at 250K(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 sudo rebootto to reboot Raspberry Pi.
2. Every device on CANBus will generate a canbus_uuid based on MCU's UID.
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 also normal.

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4.3.2 Work with BIGTREETECH RPI-CAN HAT
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
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(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 UID. If
users want to find the ID for every microcontroller, please make sure the

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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 well and is connected to the device, then it won't report the
canbus_uuid, which is normal.
4.4 Klipper Configuration
1. Enter the IP access of Raspberry Pi in the browser of the computer, and
download the reference configuration of the motherboard from the file path
shown in the figure below. 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 motherboard's configuration files to the Configuration Files.