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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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Driver Pins​

DriverSTEPDIRENUART/CSEndstop
DRIVER0gpio9gpio10gpio7gpio8-

Heating​

FunctionPin
Extruder Heatergpio6

Temperature Sensors​

FunctionPin
Extruder Thermistorgpio27
Supported Thermistor Types

The thermistor port supports NTC thermistors (100K) by default. The recommended sensor_type configuration is Generic 3950.

List of built-in sensor_type options supported by Klipper and their applicable scenarios: Thermistor Configuration Method

K-type thermocouples, PT100, etc., require additional conversion chips and cannot be connected directly to the thermistor port.

Fans​

FunctionPin
Part Cooling Fangpio13
Hotend Heat Sink Fangpio14

Probe and Endstops​

FunctionPin
HV-IN / General Inputgpio28
X Endstopgpio29
Probe / General Inputgpio25

RGB​

FunctionPin
RGB / Neopixelgpio12

Accelerometer (SPI)​

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

SignalPin
CSgpio1
MOSIgpio3
MISOgpio2
SCLKgpio0

PWM​

PWM FunctionPin
RGB / Neopixelgpio12
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