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Pin Mapping

Note
  • This page lists the pin mapping of the FLY-SB2040 V3 toolhead board after flashing the Klipper firmware, based on the product schematic.
  • UART/CS is the driver communication pin: it acts as UART when using TMC2209, and as chip select CS when using SPI drivers; the same pin is multiplexed.
  • EN is the enable pin, typically active-low in Klipper configuration (enable_pin prefixed with !).
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Driver Pins​

DriverSTEPDIRENUART/CSEndstop
DRIVER0gpio14gpio13gpio16gpio15-

Endstops​

FunctionPin
HV-IN / General Inputgpio22
General Input 0gpio18
General Input 1gpio20

Heating​

FunctionPin
Heater Port 0gpio23

Temperature Sensors​

FunctionPin
Thermistor Port 0gpio27
Supported Thermistor Types

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

List of built-in sensor_type options in Klipper that can be directly connected, along with applicable scenarios for each model: Thermistor Configuration Method

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

Fans​

FunctionPin
Fan Port 0gpio24
Fan Port 1gpio19
Fan Port 2gpio21

RGB​

FunctionPin
RGB / Neopixelgpio26

PWM​

PWM FunctionPin
RGB / Neopixelgpio26
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