Pinout

Note

• This page lists the pinout of the FLY-D5 motherboard after flashing Klipper firmware. Pin numbers are based on the motherboard schematic.
• UART/CS is the driver communication pin: used as UART with TMC2209, used as chip select CS with 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. When using endstop-less homing, configure the corresponding diag_pin according to the table below.

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Driver Pins

The FLY-D5 provides 5 driver ports:

Driver	STEP	DIR	EN	UART/CS	DIAG
DRIVER0	PC15	PC14	PC2	PC13	PB4
DRIVER1	PA1	PA0	PA2	PC3	PB3
DRIVER2	PA5	PA4	PA6	PA3	PD2
DRIVER3	PC5	PC4	PB0	PA7	PB5
DRIVER4	PB10	PB2	PB11	PB1	NC

Power Off Before Operation

Before starting, completely power off the printer and disconnect the power supply. Do not plug or unplug wiring harnesses, rearrange interface cable routing, or touch terminals while the system is powered on.

DIAG and Endstop-less Homing

Rows in the table where the corresponding driver DIAG is not - indicate that the driver's DIAG pin is connected to the corresponding input port on the main controller. When enabling endstop-less homing, configure diag_pin directly according to the table. The corresponding input port will be occupied by the DIAG signal, so do not connect mechanical or optical endstop switches simultaneously. Drivers without a listed DIAG mapping cannot be directly configured for endstop-less homing according to the table.

SPI Bus

SPI drivers such as the TMC5160 use the motherboard's hardware SPI bus. Simply configure spi_bus: spi2 in the configuration; there is no need to separately configure MOSI/MISO/SCLK pins:

[tmc5160 stepper_x]
spi_bus: spi2
cs_pin: corresponding driver's UART/CS pin

Detailed instructions on software SPI and SPI speed, etc.: SPI Configuration Method

Endstops and Probe

Function	Pin	Corresponding Driver DIAG
Endstop Port 0 / IO3	PB4	DRIVER0
Endstop Port 1 / IO2	PB3	DRIVER1
Endstop Port 2 / IO1	PD2	DRIVER2
Generic Input / IO0	PD3	-
Probe / IO4	PB5	DRIVER3

Heaters

Function	Pin
Heater Port 0	PC6
Heater Port 1	PC7

Temperature Sensors

Function	Pin
Thermistor Port 0	PC0
Thermistor Port 1	PC1

Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default. The recommended sensor_type configuration is Generic 3950.

List of Klipper built-in sensor_type options that can be directly connected and their applicable scenarios: Thermistor Configuration Method

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

Fans

Function	Pin
Fan Port 0	PC8
Fan Port 1	PC9

PWM

The FLY-D5 provides 1 PWM output, which can be used for servos, fan speed control, etc.:

Pin	Note
PA8	Servo / BLTouch control

BL-Touch

Function	Pin
Servo Signal	PA8
Probe Signal	PB5