Fly-SB2040-V2 Pin Definitions

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Fly-SB2040-V2 pin map

Table of pin functions

Device	Function	Pin number	Alias
CAN BUS	CAN-RX	gpio4
CAN BUS	CAN-TX	gpio5
Extruder	EN	gpio7	EXT_EN
Extruder	STEP	gpio9	EXT_STEP
Extruder	DIR	gpio10	EXT_DIR
Extruder	UART	gpio8	EXT_UART
Endstop	0	gpio28	LIMIT_0
Endstop	1	gpio29	LIMIT_1
Endstop	HV 2	gpio25	LIMIT_2
Hotend	Heater	gpio6	HE0
Hotend	Tempreture	gpio27	TH0
Chamber	Tempreture	gpio26	TH1
Fans	Fan 0	gpio13	FAN0
Fans	Fan 1	gpio14	FAN1
Fans	Fan 2	gpio15	FAN2
SPI	CLK	gpio0
SPI	MISO	gpio2
SPI	MOSI	gpio3
SPI	ADXL-CS	gpio1	ADXL
SPI	ADXL-INT1	gpio21
SPI	ADXL-INT2	gpio20
LED	RGB LED	gpio12	RGBLED
LED	Status LED	gpio25

Sample Configuration file: Fly-SB2040-V2.cfg

CANbus Termination Resistor

CANbus bus protocol there must be only two 120 ohm resistors on a bus.
No matter how many USB devices you connect, as long as it is on the same bus only two 120-ohm resistors are to be configured. These resistors should be at either ends of the bus.
After connecting CAN H and CAN L signal lines, use a multimeter to measure between CAN H and CAN L. The resistance between the two should be 60 ohms.

XT30 2+2 Wiring

*Color	Function
RED	12/24V
BLACK	GND
YELLOW	CAN H
WHITE	CAN L

Extruder Wiring

Hotend Wiring

• The heating circuit supports a maximum current of 10A

  

Thermistor Wiring

The standard Fly-SB2040-V2 supports thermistors and PT1000. It can however be purchased with PT100 support.

If PT100 support has been purchased, there will be a chip soldered to the back of the board as identified below.

If your Fly-SB2040-V2 has PT100 support, connect the PT100 as shown below.

Z Probe Wiring

Induction Probe

• The official recommendation of VORON is to use the Omron Omron TL-Q5MC

  

Klicky Probe

• Klicky is a third-party leveling sensor that can be made at home at a very low cost, and its performance is stable and cost-effective. The wiring method is shown in the figure below.

  

BL Touch

• BL-touch has a total of five wires, three for the first group, responsible for the power supply of the sensor and the retraction of the probe, and the second group for the ground and signal lines, which output the limit signal. Please carefully check the wiring sequence when wiring the BL-touch, the wrong wiring may permanently damage the sensor and motherboard!!! The wiring method is shown in the figure below.

  

Voron Tap

• Voron Tap is the latest leveling sensor solution released by the Voron team, which has the characteristics of high precision, strong stability and good adaptability. When wiring, please pay attention to the positive and negative poles can not be reversed, otherwise it will damage the Tap sensor and even the SHT tool board.

  

Limit switches

• There are two types of limit switches: normally open (NO) and normally closed (NC). Generally, on 3D printers, it is recommended to use normally closed (NC), so that when there is a problem with the limit switch line, the system will report an error in time, which can avoid some unnecessary crashes and avoid damage to the printer.

  

Fan Board Pins

Device	Function	Pin number	Label at header	Label at Pad	Alias
Fans	Fan 0	gpio13	PCF	AGND(Part Fan)	FAN0
Fans	Fan 1	gpio14	HEF	AGND(Hot End Fan)	FAN1
Fan PWM	Fan 0 PWM	gpio17	A1	PWM1
Fan PWM	Fan 1 PWM	gpio16	A2	PWM0
LED	RGB LED	gpio12	LED	S	RGBLED

• SB2040 supports up to two controllable fans, fan voltage can be selected 24V, 5V, support 2, 3, 4-wire fans, wiring method is as follows.

  

  

RGB Wiring

• The positive and negative poles of the RGB LEDs must not be reversed, otherwise it will damage the CAN tool board.

  

Links

• Mellow Board information site
• Mellow Store
• Mellow Github
• Klipper 3d-Printer firmware
• CanBoot CanBoot Bootloader by Arksine
• Fluidd User interface for Klipper
• Mainsail user interface for Klipper