BIG TREE TECH Rumba32 V1.0 Installation instructions

Rumba32 V1.0 mannul SHENZHEN BIGTREE TECHNOLOGY CO., LTD.
1/8 website：www.BIGTREE-TECH.com
SHENZHEN BIGTREE TECHNOLOGY CO., LTD.
BIG TREE TECH
BIGTREETECH
Rumba32 V1.0
User's Instruction

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1.Product Introduction
BTT Rumba32 V1.0 motherboard is a high-performance 3D printer
main control board with STM32F446VET6 as the core controller
by the 3D printing team of Shenzhen Biqu Technology Co., Ltd.
aim at to some problems in the motherboards on the market.
2.Features
1）The main control adopts the 32-bit ARM-level Cortex-M4
series STM32F446VET6 chip with a frequency of 180MHz, which
greatly improves the performance；
2）Equipped with highly modular open source firmware Marlin2.0,
which is convenient for users to DIY and reopen,to avoid
the worries of not being able to master the core code;
3)Marlin2.0 uses powerful development tools，Visual Studio
Code Integrated Development Environment：Support online
debugging ，More helpful for product development and
performance optimization，Developed in C language，Low
development threshold;
4）The PCB board wiring is rigorous and beautiful, and has
been specially optimized for heat dissipation；
5）Use dedicated power chip，Support 12-30V power input；
6）Accepts 24V input, and can reduce the hot-bed current to
1/4 under the same power, effectively solving the hot-bed
MOS tube heating problem；
7）Support BIGTREETECH-3.5 inch screen (12864 mode, or use
DuPont line to connect EPX3 corresponding serial port pin,
TFT mode can also be realized), LCD2004 screen, LCD12864
screen；
8）The system supports simplified Chinese, English and other
languages, which can be switched by itself；
9）Upgrade the configuration firmware via USB, the operation
is simple, convenient and efficient；
10）Onboard EEPROM, model 24LC32AT-I/OT
11）6 motor drives，Two fixed voltage extruders (power supply

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voltage)，An optional voltage extruder (power supply
voltage or 12V)，Two CNC fans；
12）Support shut down after printing；
13 ）Using high-performance MOSFET tube, better heat
dissipation effect；
14）The use of plug gable fuses makes the replacement process
easier；
15）Reserve I2C expansion ports, up to 10 expansion IOs for
user definition；
16）Double limit switches are reserved for X, Y, and Z axes；
17）Reserve 5 channels for NTC detection
18）Support RGB light bar
19）Support offline printing and online printing；
20）Reserve a user button、Onboard LED working indicator，Can
be configured by users
21）Motor connection reserved 2.54MM pin header and 3.5MM
pitch wiring screw terminal two ways
3.Mainboard Parameters
1）Physical dimension：135*75mm
2）Installation size：127.25*64.45mm
3）Microprocessor：ARM 32-bit Cortex™-M4 CPU
4）Input voltage：DC12V—DC30V
5）Motor driver：Support TMC5160、TMC2208、TMC2209、TMC2130、
A4988 and so on
6）Drive working mode support：TMC2130SPI、TMC5160SPI、TMC2209
UART
7）Motor drive interface：X、Y、Z、E0、E1、E2,6 routes
8）Temperature sensor interface：T0、T1、T2、T3、TB，4 routes
100K NTC（Thermal resistance）
9）Display screen：BIGTREETECH-3.5inch TFT、LCD2004、LCD12864
10）PC communication interface：Micro USB，Easy to plug，
Communication baud rate 115200
11）Extended interface function support: Shut down after
printing、PWM 、ADC、UART、I2C and so on

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12）Support file format：G-code
13）Recommended software:Cura、Simplify3D、pronterface、
Repetier-host、Makerware
14）Multi-power supply, share the pressure of the single power
line withstand current。
4.Mainboard power selection
1、Selection of heating rod 3 and controllable fan power
jumper cap
①Power supply voltage uses heating rods and fans
②12V using heating rod and fan↓
1）As shown in the figure, when the jumper cap is shorted
between the middle and the side close to the terminal, the

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main fan or heating rod 3 selects the current power supply
voltage. On the contrary, when the jumper cap is shorted
between the middle and one side of the principle
terminal ,the selected voltage is 12V.
2）Do not short-circuit both sides of the 3Pin header
5.Mainboard power wiring method
1.Switching power supply dual power supply method
As shown in the figure above, you need to connect two sets
of power cords to supply power to the motherboard. They are
the motherboard power supply and the hot bed power supply.
The extra one is the hot bed interface (the wiring in the
picture is red positive and black negative)
Be sure to disconnect the 220V power supply when wiring,
and distinguish the positive and negative poles to avoid

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burning the motherboard.
6.Mainboard and computer communication
After the motherboard is connected to the computer via
the USB cable, the computer will automatically install the
driver. After the driver is installed, the motherboard can
be recognized for data transmission. If the installation
fails, you can go to our open source website：
https://github.com/bigtreetech?tab=repositories
Find the corresponding motherboard to download the driver.
After the driver is installed, open the "Device Manager" and you can
see the ports as shown in the figure below, indicating that the
motherboard is connected to the computer normally.
7.Mainboard interface description
1、Mianboard size Diagram

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2、Mianboard wiring Diagram
3、、 Mainboard Pin Diagram
For details,please refer to Pin file information.
8.Mode and interface description
1、STEP/DIR mode
According to the driver used,corresponding to the subdivision table,use the jumper cap to select
the subdivision.

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Note:The high level is connected to the upper two
pins,and the low level is connected to the lower two
pins.
2、UART mode
When using UART mode,you need to connect the header pins
with jumper caps as shown in the figure.
3、SPI mode
When using SPI mode,you need to connect the header pins
with jumper caps as shown in the figure.

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9.Mainboard firmware description
1、Only support our open source Marlin2.0 firmware,you can
find the corresponding motherboard to download from our
open source website:
https://github.com/bigtreetech?tab=repositories
2、1）Firmware update method
Connect the motherboard to the PC,as shown in the figure:
1.After getting the motherboard,follow the picture above,insert the jumper cap (as
shown in the picture)and connect the usb to the computer,and then open
"Computer->Management->Device Manager".As shownbelow:

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We can see that there is no"STM32BOOTLOADER"device under"Universal Serial
Bus Devices".At this time we need DFU driver installation.
2）DFU Driver Installation
1.You can go to the ST official website to get the open source driver.
2.It can also be downloaded directly on bigtree's github.
3.Open the downloaded driver.Install,as shown in the figure:
Double click DfuSe_Demo_V3.0.6_Setup.exe。

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Click“Next”
Click"Next",the driver file is not big,generally choose the default installation path,you can
click"Next"all the way

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At this point,click"Finish"to complete the installation.
After the installation is complete,we can check again under"Computer->Management->
Device Manager""Universal Serial Bus Controller"will appear"STM Device in DFU Mode".
AtthistimeyoucanuseDfuprogrammingsoftwareforofflineburningWrite,but the steps are
cumbersome.Our purpose is to perform online programming in the Vs code Platform IO
environment.In principle,it can be burned online in the Vs code Platform IO environment at
this time,but an error occurred during the burn,and the driver may be abnormal after
Consulting the data.At this time,we need to install the following software to repair the
Driver problem.As shown:
Double-click to run this software

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Wait for the installation to complete...
After the installation is complete,check again"Computer->Management->Device
Manager->Universal Serial Bus Devices"
We can see that there is a"STM32BOOTLOADER"device,indicating that we have
successfully installedit.
3. Firmware burning
1、After configuring the firmware under Vs code PlatForm IO ,click directly

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2、Waiting to compile and flash the firmware
3、As shown in the figure above,the firmware is successfully burned!
Pull and insert the jumper cap to the position shown in the figure,and then press reset to restart
the motherboard.
10.Notes
1、The firmware currently only support sour open source

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Marlin2.0 firmware.
2、U disk function is temporarily not supported,so stay
tuned!
3、The power of the hot bed connected to the motherboard
must be less than or equalto180W(that is,the resistance value
of the hotbed is greater than 0.8Ω),if a high-power heating
be disused,an external heating bed power expansion board must
be connected;
4、When supplying 12V/24V power to the motherboard,be sure
to pay attention to the positive and negative poles of the
power supply.
5、Before powering on,ensure that all wires,jumpers,and
Drivers are plugged incorrectly and completely.
6、Do not plug or unplug the drive module with power to
7、When wiring the motherboard,be sure to pay attention
to the correctness of the positive and negative poles of the
power supply,drive direction,and power supply selection
before powering on.avoid damage.