Pinout

Note

• This page lists the pinout of the FLY-SHT36 V3 tool board after flashing Klipper firmware. The pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: used 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 usually active low (with the ! prefix in enable_pin).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio7	gpio6	gpio14	gpio15	-

Endstops

Function	Pin
HV-IN / General purpose input	gpio20
Endstop port 0 / General purpose input	gpio16
Probe / General purpose input	gpio22

Heating

Function	Pin
Heater port 0	gpio23
Heater / Output port 1	gpio5

Temperature Sensors

Function	Pin
Thermistor port 0	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 in Klipper that can be directly connected and their applicable scenarios for each model: Thermistor Configuration Method

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

Fans

Function	Pin
Fan port 0	gpio13
Fan port 1	gpio21

RGB

Function	Pin
RGB	gpio26

Accelerometer (SPI)

The accelerometer uses the designated SPI bus on the tool board. Configure spi_bus: spi0_gpio4_gpio3_gpio2 in the configuration:

Signal	Pin
CS	gpio12

[lis2dw]
cs_pin: sht36v3:gpio12
spi_bus: spi0_gpio4_gpio3_gpio2

PWM

PWM Function	Pin
RGB	gpio26