Pinout

Note

• This page lists the pinout of the FLY Tool-Lite CAN 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 an SPI driver. The same pin is shared for both functions.
• EN is the enable pin. In Klipper configuration, it is typically active-low (with ! prefix in enable_pin).

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Interactive Pin Hotspots

The image below uses the product image of FLY Tool-Lite CAN 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-Tool-LiteMotor 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.

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio24	gpio23	gpio29	gpio25	-

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	gpio6

Temperature Sensors

Function	Pin
Extruder thermistor	gpio28

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	gpio13
Heat break cooling fan	gpio14

Accelerometer (SPI)

The accelerometer uses software SPI. Three signal pins must be assigned separately:

Signal	Pin
CS	gpio9
MOSI	gpio11
MISO	gpio8
SCLK	gpio10

Probe and Endstops

Function	Pin
Generic input 0	gpio17
Generic input 1	gpio20
Generic input 2	gpio16
Probe / Generic input	gpio19
HV-IN / Generic input	gpio22
BLTouch / Servo control	gpio7

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

PWM

PWM Function	Pin
BLTouch / Servo control	gpio7