Pinout

Note

• This page lists the pinout of the FLY-SHT36 PRO tool board after flashing the Klipper firmware. The pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: it functions as UART when using TMC2209, and as the chip select CS when using SPI drivers. The same pin is multiplexed.
• EN is the enable pin. It is typically active-low in Klipper configuration (with ! prefix in enable_pin).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio23	gpio24	gpio25	gpio20	-

Heating

Function	Pin
Extruder Heating	gpio8

Temperature Sensors

Function	Pin
Extruder Thermistor	gpio26
Box	gpio27

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 directly 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

Function	Pin
Part Cooling Fan	gpio15
Heat Sink Cooling Fan	gpio14

Probe and Endstop

Function	Pin
HV-IN / Generic Input	gpio21
Generic Input	gpio2
Probe / BLTouch signal (sensor_pin)	gpio3
BLTouch / Servo Control	gpio7

RGB

Function	Pin
RGB / Neopixel	gpio6

Accelerometer (SPI)

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

Signal	Pin
CS	gpio9
MOSI	gpio11
MISO	gpio12
SCLK	gpio10

PWM

PWM Function	Pin
RGB / Neopixel	gpio6
BLTouch / Servo Control	gpio7