Pinout

Notes

• This page lists the pinout of the FLY-E3-PRO motherboard after flashing Klipper firmware. The pin numbers follow the motherboard schematic.
• UART/CS is the driver communication pin: used as UART with TMC2209, and as chip select CS with SPI drivers such as TMC5160. The same pin is shared for both functions.
• EN is the enable pin. In Klipper configuration, it is typically active-low (with ! prefix on enable_pin).
• DIAG is the driver diagnostic signal pin. When the pin mapping is not listed in the table on this page, refer to the actual board connections and 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 Notes

The current table does not list the limit switch mapping for the driver DIAG pins. The corresponding driver DIAG entries in both the limit switch and probe tables are all -. Before configuring endstops, refer to the actual board connections and product documentation.

Endstops and Probe

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

Heating

Function	Pin
Heated Bed	PA0
Heater 0	PA5
Heater 1	PC6

Temperature Sensors

Function	Pin
Bed Thermistor	PA3
Thermistor 0	PA4
Thermistor 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 supported by Klipper for direct connection, along with their applicable scenarios: Thermistor Configuration Guide

K-type thermocouples, PT100, and others require additional signal conversion chips and cannot be connected directly to the thermistor ports.

Fans

Function	Pin
Fan 0	PA7
Fan 1	PA6
Fan 2	PB6
Fan 3	PB7

PWM

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

Pin	Notes
PB0	Servo / BLTouch control

BL-Touch

Function	Pin
Servo signal	PB0
Probe signal	PC5