BIG TREE TECH BTT SKR MINI E3 V3.0 User manual

BIGTREETECH
SKR MINI E3 V3.0
User Manual

Instruction
BTT SKR MINI E3 V3.0 is a motherboard designed for Ender3,
which launched by the 3D printing team of Shenzhen Big Tree
Technology Co., Ltd. It is the perfect replacement of the original
motherboard of Ender3.
Features
Redesigned motherboard ID(Industrial Design) make it
good-looking
Adopts STMicroelectronics G0 series MCU STM32G0B1RET6
Upgraded heat sink improves heat dissipation
Thermistor inputs are protected from short circuit to Vin
Added a third PWM controlled cooling fan output
Adopt MicroUSB instead of MiniUSB interface
Added +3.3V power supply for SPI output header

Motherboard LED meanings
Parameters
Product size:
103.75*70.25mm
Mounting size:
Please refer to BTT SKR MINI E3 V3.0-SIZE.pdf
for more
Board layer:
4
MCU:
ARM Cortex-M0+ STM32G0B1RET6
Power input:
DC 12/24V
Logic voltage:
3.3V
Motor driver:
UART mode of on-board TMC2209
Interfaces of motor driver:
XM, YM, ZAM, ZBM, EM
Interface of temperature sensor:
TH0, THB, 2-way 100K NTC (RTD)
Display screen:
2.4-inch TFT, 3.5-inch TFT, Ender3 original
LCD12864 screen, etc.
PC communication interface:
USB Micro B type, easy to plug,
communication baud rate 115200
Recommended software:
Cura, Simplify3D, Pronterface, Repetier-host, Makerware
File format:
G-code
Power LED = Red. Solid on = Normal power supply
Status LED = Red. Blinking during a firmware update. Controlled by
firmware otherwise
When the motherboard is powered on:

D6 green light for the heating rod E0 status indicator:
always on when heating, off when not heating;
D10 green light for the CNC fan FAN0 status indicator: on when open,
off when closed.
D6 green light for the heating rod E0 status indicator:
always on when heating, off when not heating;
D6 green light for the heating rod E0 status indicator: always on when
heating, off when not heating;
D8 green light for the hot bed HB status indicator: always on when
heating, off when not heating;
D7 green light for the CNC fan FAN1 status indicator: on when open, off
when closed.
D3 green light for the CNC fan FAN2 status indicator: on when open, off
when closed.
D9 green light for the SD card status indicator: light up when inserted
into the SD, off when pulled out
Communication of Motherboard and PC
The motherboard can communicate with a PC using the USB interface.
The same USB interface can be used to communicate with a Raspberry
pi or any other host device.

Motherboard Interfaces
Size Diagram
Wiring Diagram

Sensorless homing function
As shown, connect the corresponding axes with the jump caps to choose
Sensorless homing function
If you choose this function, you cannot use external ENDSTOP!
NOTE:
5V power supply for BLtouch, TFT, RGB interfaces
1、 To use the onboard 5V PSU, short the pins shown in the above image using a jumper.
2、To use an external BIGTREETECH DCDC5V V1.0 module, short the pins shown in the above
image using a jumper.

Connection to BIGTREETECH Relay V1.2
Connection of cooling fan
Connection to BTT UPS 24V V1.0
Connect the fan by FAN2 to realize the whole machine cooling.
Pleast note that the operating voltage is the same with the input power supply voltage to avoid
damage.

Connection to Neopixel light
Connection to BL touch

Firmware of motherboard
Caution
The package contains the firmware for testing (Ender3), which can be
used directly or changed according to your needs.
The text form and file name of firmware in the SD card cannot be
changed from “firmware.bin”.
The wiring must be done before powering on.
The LCD screen only supports the LCD12864 screen with
CR10_STOCKDISPLAY interface.
How to get the firmware
Contact our customer service or technical support;
Login to our website to download: https://github.com/bigtreetech
Please refer to the BTT SKR MINI E3 V3.0-PIN.pdf
for motherboard firmware DIY.
Motherboard firmware update
Copy firmware.bin file to the root directory of SD card
Insert the SD card into the slot, re-power on or reset, the update will complete after 10S，
And you should see the status LED blinking red during the update..
Do not change file name!
NOTE:
Should you have any issues, please don't hesitate to contact us. We
strive to provide you with the best quality products and services. If
you have any good comments or suggestions, please feel free to share
with us. Thank you for choosing BIGTREETECH products!