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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Interactive Pin Hotspots

The image below uses the product image of FLY-SHT36 PRO and the same hotspot data (hotspot positions are identical to the SHT36 V2, pins follow this board's definition). Use the device-type filters to show only compatible connectors; click a hotspot to see which devices it accepts, common Klipper configuration options, and notes.

Filter by deviceClick a device type to show only connectors that support it; click again to clear the filter.

FLY-SHT36 PROMotor driversHeatersThermistorsFansEndstopsServoProbeRGB

Hover to see the pin; click a hotspot to view compatible devices and configs. Pins can be copied from the detail panel, except for driver connectors.

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Driver Pins

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

Power Off Before Operation

Before starting, completely shut down the printer and disconnect the power supply. Do not plug or unplug wiring harnesses, organize interface wiring, or touch terminals while the power is on.

Heating

Function	Pin
Extruder Heating	gpio8

Temperature Sensors

Function	Pin
Extruder Thermistor	gpio26
Box	gpio27

Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default, with sensor_type recommended as Generic 3950; they also support 2-wire PT1000, configured by setting sensor_type to PT1000.

List of sensor_type options that can be directly connected internally by Klipper and their applicable scenarios: Thermistor Configuration Method

K-type thermocouples, 3-wire PT100, etc., require additional signal conditioning chips and cannot be connected directly to the thermistor ports.

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

For wiring of micro switches, optical endstops, proximity sensors, and TAP, see: Endstop Wiring Guide

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