Pin Mapping

Note

• This page lists the pin mapping of the FLY-SHT36 tool board after flashing 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 chip select CS when using SPI drivers. The same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is typically active-low (the enable_pin is prefixed with !).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	PB4	PB3	PA15	PB5	-

Heating

Function	Pin
Extruder Heater	PA8

Temperature Sensors

Function	Pin
Extruder Thermistor	PB0
PT100	PA3

Supported Thermistor Types

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

List of sensor_type options built into Klipper and their applicable scenarios: Thermistor Configuration Guide

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

Fans

Function	Pin
Part Cooling Fan	PB10
Heat Sink Fan	PB11

Probe & Endstops

Function	Pin
BLTouch Signal (sensor_pin)	PC15
BLTouch Control (control_pin)	PB1
X Endstop	PA0

RGB

Function	Pin
RGB / Neopixel	PB15

Accelerometer (SPI)

The accelerometer uses the tool board's hardware SPI bus. Configure spi_bus: spi1 in the settings; there is no need to separately configure the MOSI/MISO/SCLK pins:

Signal	Pin
CS	PA4

[adxl345]
cs_pin: sht36:PA4
spi_bus: spi1

PWM

PWM Function	Pin
RGB / Neopixel	PB15
BLTouch Control (control_pin)	PB1