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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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	-

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	-

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. It is recommended to configure sensor_type as Generic 3950.

List of built-in sensor_type options directly supported by Klipper and their applicable scenarios: Thermistor Configuration Guide

K-type thermocouples, PT100, etc., require additional signal conversion 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