Pinout

Note

• This page lists the pinout of the FLY-SHT36 (LIS3DH) tool board after flashing the Klipper firmware. The pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: used as UART with TMC2209, or as chip select CS when using SPI drivers; the same pin is shared.
• EN is the enable pin. In Klipper configuration, it is typically active-low (with a ! prefix in enable_pin).

Loading...

---

Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio24	gpio23	gpio25	gpio1	-

Heater

Function	Pin
Hotend Heater	gpio8

Temperature Sensors

Function	Pin
Hotend Thermistor	gpio26
Box	gpio27

Supported Thermistor Types

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

Klipper built-in sensor_type list and 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 ports.

Fans

Function	Pin
Part Cooling Fan	gpio14
Heat Sink Cooling Fan	gpio15

Probe and Endstop

Function	Pin
Probe	gpio3
BLTouch / Servo Control	gpio7
X Endstop	gpio21

RGB

Function	Pin
RGB / Neopixel	gpio6

PWM

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