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BIGTREETECH SKR 3, User Manual

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BIGTREETECH SKR 3 User Manual Download Page 12

Shenzhen Big Tree Technology CO.,LTD .  

BIG TREE TECH

 

 

 

 

12 / 39 

 

 

 

3.2.2 UART mode of TMC driver 

i.e：TMC2208、TMC2209、TMC2225 etc. Place jumpers according to the diagram 
below，microstep and current can be configured in firmware.

 

3.2.3 TMC driver SPI mode 

i.e：TMC2130、TMC5160、TMC5161 et.c，Place jumpers according to the diagram 
below，microstep and current can be configured in firmware. 

 

3.2.4 TMC driver DIAG(Sensorless Homing) 

When using sensorless homing, place jumpers according to the diagram below, 
there is no need to cut the DIAG pin off when not being used. 

 

 

 

 

 

 

Summary of Contents for SKR 3

Page 1: ...BIGTREETECH 1 39 BIGTREETECH SKR 3 User manual...

Page 2: ...n 10 3 1 USB power supply 10 3 2 Stepper driver 10 3 2 1 STEP DIR STANDALONE mode 10 3 2 2 UART mode of TMC driver 12 3 2 3 TMC driver SPI mode 12 3 2 4 TMC driver DIAG Sensorless Homing 12 3 3 USB an...

Page 3: ...Sensorless homing 21 4 3 6 100K NTC or PT1000 22 4 3 7 BLTouch 22 4 3 8 Auto power off Relay V1 2 25 4 3 9 Power loss revovery 25 4 3 10 RGB 26 4 3 11 Filament sensor 27 4 3 12 smart filament sensor S...

Page 4: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 4 39 7 Precausions 38 8 FAQ 39...

Page 5: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 5 39 Revision History version Note Date 01 00 Original 2022 03 08...

Page 6: ...dge connection 5 Selectable voltage 24V 12V 5V by SKR 3 DC MODE for CNC fan Note The voltages of the 3 CNC fans are unified different voltages cannot be set separately for different ports no more need...

Page 7: ...nt 5 5A continuous 6A instantaneous 10 Fan port 3 X CNC selectable voltage 2 X always on PSU voltage 11 Fan port max current 1A continuous 1 5A instantaneous 12 Overall max current HB E0 E0 All fans 1...

Page 8: ...ig Tree Technology CO LTD BIG TREE TECH 8 39 23 Recommended Slicer Console Cura Simplify3D Pronterface Repetier host Makerware 1 3 Firmware Supported Firmware Marlin Klipper RRF not supported YET 1 4...

Page 9: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 9 39 2 Peripheral Port 2 1 Connector diagrams 2 2 Pinout diagram...

Page 10: ...the MCU will light up indicating power on When using only USB to power the boar Please insert the jumper cap onto the VUSB jumper 3 2 Stepper driver 3 2 1 STEP DIR STANDALONE mode i e A4988 DRV8825 L...

Page 11: ...L L H 1 2 1 2 Phase L H L 1 4 W1 2 Phase L H H 1 8 H L L 1 16 H L H 1 32 H H L 1 32 H H H 1 32 Current 0 1 Driver chips MD3 MD2 MD1 Microsteps Excitation Mode LV8729 Maximum 128microsteps 36V 1 8A L...

Page 12: ...and current can be configured in firmware 3 2 3 TMC driver SPI mode i e TMC2130 TMC5160 TMC5161 et c Place jumpers according to the diagram below microstep and current can be configured in firmware 3...

Page 13: ...sing DCIN as CNC fan voltage Connect jumper between the two pins of VOT and insert SKR 3 DC MODE on to the 2 4 Pin sockets if 12V or 5V is desired Note The voltages of the 3 CNC fans are unified diffe...

Page 14: ...ing When using 100K NTC no jumpers need to be connected the pull up resistance of TH0 TH1 is 4 7K When using PT1000 the jumpers indicated in the picture below needs to be connected the pull up resista...

Page 15: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 15 39 3 7 Auto power off Relay V1 2 wiring 3 8 Power loss recovery UPS 24V V1 0 wiring PS ON PE4 GND L IN L OUT N PC15 24V GND...

Page 16: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 16 39 3 9 RGB wiring 3 10 Filament sensor wiring 5V PE6 GND 5V GND PC2...

Page 17: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 17 39 3 11 Display wiring 5V GND PA9 PA10 Reset EXP 2 EXP 1...

Page 18: ...newest bugfix version of Marlin from official website https github com MarlinFirmware Marlin tree bugfix 2 0 x 2 Download Pre configured firmware from our GitHub page https github com bigtreetech SKR...

Page 19: ...D to BOARD_BTT_SKR_3 Enable serial ports according to your needs define MOTHERBOARD BOARD_BTT_SKR_3 define SERIAL_PORT 1 enable TFT serial port define BAUDRATE 115200 set baudrate to the same as the c...

Page 20: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 20 39 4 3 4 Configure stepper driver When using SPI mode TMC_USE_SW_SPI needs to be Uncommented in Configuration_adv h define TMC_USE_SW_SPI...

Page 21: ...d sensitivity too high will cause endpoint to trigger before gantry actually move to the end lower number results in less sensitive trigger threshold too low of sensitivity will cause endpoint to not...

Page 22: ...sistance is 4 7K when using Pt1000 pullup resistance is 1K set sensor type to 1 for 100K NTC 4 7K pullup resistance 1010 for PT1000 1K pullup resistance define TEMP_SENSOR_0 1 define TEMP_SENSOR_1 1 d...

Page 23: ...ZZLE_TO_PROBE_OFFSET 40 10 2 85 set BLtouch probe offset define PROBING_MARGIN 10 set distance between probe area and print area perimeter define AUTO_BED_LEVELING_BILINEAR set probe pattern define RE...

Page 24: ...ient define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X set number of probe points for Y axis to the same as X axis If bltouch also functions as your Z homing sensor no wiring change is needed define USE_PROB...

Page 25: ...two methods for power lost recovery 1 No extra module needed the motherboard will write current print status to the SD card after every layer is printed which shortens the life of the SD card severel...

Page 26: ...ted part define POWER_LOSS_STATE HIGH set signal level UPS 24V V1 0 returns low level when not triggered and HIGH level when power is cut thus this setting needs to be HIGH 4 3 10 RGB define NEOPIXEL_...

Page 27: ...andard filament run out sensors are usually comprised of a microswitch which signals the mainboard of filament status with High or Low level signal define FILAMENT_RUNOUT_SENSOR enable filament run ou...

Page 28: ...E_MM 3 set sensitivity SFS V1 0 nominal setting should be 7mm which means if no signal of filament movement is detected after 7mm of filament travel command filament error will be triggered SFS V2 0 n...

Page 29: ...rt between ESP8266 and Marlin on the motherboard is UART3 the newest ESP3D firmware can be found at https github com luc github ESP3D compile your own binary file and rename to esp3d bin copy to the r...

Page 30: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 30 39 4 4 Compile firmware 1 Click to compile firmware 2 Copy the compiled firmware bin to SD card and insert to motherboard to update firmware...

Page 31: ...in WebUI popular choices are Fluidd Mainsail etc Fluidd https github com fluidd core FluiddPI releases Mainsail https github com mainsail crew MainsailOS releases Or refer to Klipper official installa...

Page 32: ...Shenzhen Big Tree Technology CO LTD BIG TREE TECH 32 39 5 2 Write image 1 Insert Micro SD to your computer 2 Choose OS 3 Select Use custom then select the image that you downloaded...

Page 33: ...logy CO LTD BIG TREE TECH 33 39 4 Select the SD card and click WRITE WRITE the image will format the SD card Be careful not to select the wrong storage device otherwise the data will be formatted 5 Wa...

Page 34: ...o not open it with windows notepad 3 delete insert the correct wifi SSID and password then save the file 5 4 ssh connect to raspberry pi 1 Install the ssh application Mobaxterm https mobaxterm mobatek...

Page 35: ...ess in the current network organize by names find the IP named Fluidd or Mailsail like shown below 6 Open Mobaxtermand click Session and click SSH inset the raspberry pi IP into Remote host and click...

Page 36: ...H743 Bootloader offset 128KiB bootloader SKR SE BX v2 0 Clock Reference 25 MHz crystal Communication interface USB on PA11 PA12 2 Press q to exit and Yes when asked to save the configuration 3 Run mak...

Page 37: ...ectory shown below if there is no such config available update your klipper source code to the newest version or download from github https github com bigtreetech SKR 3 2 Upload your finished config f...

Page 38: ...le has been renamed to firmware cur the firmware has been successfully updated 7 Precausions 1 When not using PT1000 do not connect any jumper in the PT1000 pins otherwise 100K NTC will not work 2 Max...

Page 39: ...5A continuous 6A instantaneous Fan port 1A continuous 1 5A instantaneous combined current of heated bed heater cartridge and fan port should not exceed 10A Q Can not update firmware with SD card A ma...

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