Pinout

Note

• This page lists the pinout of the FLY-E3-PRO motherboard after flashing Klipper firmware. The pin numbers are based on the motherboard schematic.
• UART/CS is the driver communication pin: used as UART when using TMC2209, and as chip select CS when using SPI drivers such as TMC5160. The same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is typically active low (with ! prefix in enable_pin).
• DIAG is the driver diagnostic signal pin. If the correspondence is not listed in the table on this page, refer to the actual pinout of the motherboard and the product documentation.

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Interactive Pin Hotspots

The image below uses the FLY-E3-PRO product image and the same hotspot data from the Klipper configuration generator. Use the device filters above to show only compatible connectors; click a hotspot to see compatible devices, common Klipper configuration sections, and notes. Use “Locate in pin table” in the detail panel to jump to and highlight the corresponding row below. Hover still shows the connector name and pin. 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-E3-PROMotor driversHeatersThermistorsFansEndstopsProbe / servo

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.

Driver Pins

The FLY-E3-PRO provides 5 driver ports:

Driver	STEP	DIR	EN	UART/CS	DIAG
DRIVER0	PE3	PE2	PE5	PE4	-
DRIVER1	PB9	PB8	PE1	PE0	-
DRIVER2	PA15	PD7	PC2	PA8	-
DRIVER3	PD4	PD3	PD6	PD5	-
DRIVER4	PC13	PC0	PC15	PC14	-

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.

DIAG Note

The current table does not list the endstop correspondence for the driver DIAG pins. Both the endstops and the probe table show - for Corresponding Driver DIAG. Before configuring endstop homing, refer to the actual pinout of the motherboard and the product documentation.

Endstops and Probe

Function	Pin	Corresponding Driver DIAG
Endstop Port 0 / IO0	PA2	-
Endstop Port 1 / IO1	PB10	-
Endstop Port 2 / IO2	PC4	-
Probe	PC5	-

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

Heating

Function	Pin
Heated Bed	PA0
Heater Port 0	PA5
Heater Port 1	PC6

Temperature Sensors

Function	Pin
Bed Thermistor	PA3
Thermistor Port 0	PA4
Thermistor Port 1	PA1

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
Fan Port 0	PA7
Fan Port 1	PA6
Fan Port 2	PB6
Fan Port 3	PB7

PWM

The FLY-E3-PRO provides 1 PWM output, which can be used for servos, fan speed control, etc.:

Pin	Remarks
PB0	Servo / BLTouch control

BL-Touch

Function	Pin
Servo Signal	PB0
Probe Signal	PC5

EXP Interface

EXP Configuration Reminder

• The EXP header is commonly used for displays like the Mini12864 or other expansion peripherals.
• If a pin is already occupied by SPI, UART, endstop, fan, or other functions, do not configure it again for an EXP peripheral.

EXP1

Function	Pin
EXP1_1	PE11
EXP1_2	PE12
EXP1_3	PA14
EXP1_4	PE6
EXP1_5	PE9
EXP1_6	PE10
EXP1_7	PE7
EXP1_8	PE8
EXP1_9	GND
EXP1_10	5V

EXP2

Function	Pin
EXP2_1	PB4
EXP2_2	PB3
EXP2_3	PA10
EXP2_4	PB2
EXP2_5	PA9
EXP2_6	PB5
EXP2_7	PA13
EXP2_8	RST
EXP2_9	GND
EXP2_10	NC