Pin Mapping

Note

• This page lists the pin mapping of the FLY-SB2040 Pro V3 tool board after flashing Klipper firmware. Pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: when using TMC2209, it functions as UART; when using an SPI driver, it functions as the chip select CS. The same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is typically active low (the enable_pin has a ! prefix).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio14	gpio13	gpio16	gpio15	-

Endstops

Function	Pin
HV-IN / General Input	gpio22
General Input 0	gpio18
General Input 1	gpio20

Heating

Function	Pin
Heater Port 0	gpio23

Temperature Sensors

Function	Pin
Thermistor Port 0	gpio27

Supported Thermistor Types

The thermistor port supports NTC thermistors (100K) by default. It is recommended to configure the sensor_type as Generic 3950.

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

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

Fans

Function	Pin
Fan Port 0	gpio24
Fan Port 1	gpio19
Fan Port 2	gpio21

RGB

Function	Pin
RGB / Neopixel	gpio26

PWM

PWM Function	Pin
RGB / Neopixel	gpio26