Pinout

Note

• This page lists the pinout of the FLY-SB2040 toolboard after flashing the Klipper firmware. Pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: used as UART when using TMC2209, and used as chip select CS when using SPI drivers. The same pin is multiplexed.
• EN is the enable pin, typically active-low in Klipper configuration (with a ! prefix in enable_pin).

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Interactive Pin Hotspots

The image below uses the product image of FLY-SB2040 and the same hotspot data. Use the device-type filters to show only compatible connectors; click a hotspot to see which devices it accepts, common Klipper configuration options, and notes. Hover to see the connector name and pins; always verify the silkscreen and connector positions against the physical board and schematic.

Filter by deviceClick a device type to show only connectors that support it; click again to clear the filter.

FLY-SB2040 V2Motor driversHeatersThermistorsFansEndstopsRGB

Hover to see the pin; click a hotspot to view compatible devices and configs. Pins can be copied from the detail panel, except for driver connectors.

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio9	gpio10	gpio7	gpio8	-

Power Off Before Operation

Before starting, completely shut down the printer and disconnect the power supply. Do not plug or unplug wiring harnesses, organize interface wiring, or touch terminals while the power is on.

Heating

Function	Pin
Extruder Heater	gpio6

Temperature Sensors

Function	Pin
Extruder Thermistor	gpio27

Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default, with sensor_type recommended as Generic 3950; they also support 2-wire PT1000, configured by setting sensor_type to PT1000.

List of sensor_type options that can be directly connected internally by Klipper and their applicable scenarios: Thermistor Configuration Method

K-type thermocouples, 3-wire PT100, etc., require additional signal conditioning chips and cannot be connected directly to the thermistor ports.

Fans

Function	Pin
Part Cooling Fan	gpio13
Hotend Heat Sink Fan	gpio14

Probe and Endstops

Function	Pin
HV-IN / General Input	gpio28
X Endstop	gpio29
Probe / General Input	gpio25

For wiring of micro switches, optical endstops, proximity sensors, and TAP, see: Endstop Wiring Guide

RGB

Function	Pin
RGB / Neopixel	gpio12

Accelerometer (SPI)

The accelerometer uses software SPI and requires three separate signal pins to be specified:

Signal	Pin
CS	gpio1
MOSI	gpio3
MISO	gpio2
SCLK	gpio0

PWM

PWM Function	Pin
RGB / Neopixel	gpio12