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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Interactive Pin Hotspots

The image below uses the product image of FLY-SHT36 (shared by SHT36 / SHT42) and the same hotspot data. 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. Hover to see the connector name and pins; always verify the silkscreen and connector positions against the physical board and schematic.

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

FLY-SHT36Motor driversHeatersThermistorsFansEndstopsServoProbe

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.

FLY-SHT42 Pin Diagram

The SHT42 has the same pin definitions as the SHT36, but the connector positions differ. The image below labels the pins for each SHT42 connector:

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FLY-SHT42 Interactive Pin Hotspots

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

FLY-SHT42Motor 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	PB4	PB3	PA15	PB5	-

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 Heater	PA8

Temperature Sensors

Function	Pin
Extruder Thermistor	PB0
PT100	PA3

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	PB10
Heat Sink Fan	PB11

Probe & Endstops

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

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

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