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, 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 the ! prefix in enable_pin).
• DIAG is the driver diagnostic signal pin. When using sensorless 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 turn off the printer and disconnect the power supply. Do not plug or unplug cables, rearrange connector wiring, or touch terminals while the power is on.

DIAG and Sensorless Homing

In the table, rows where the corresponding driver DIAG is not - indicate that the DIAG signal of that driver is already connected to the corresponding input port on the main controller. When enabling sensorless homing, configure the diag_pin directly according to the table. The corresponding input port will be occupied by the DIAG signal. Do not connect mechanical or optical endstops simultaneously. Drivers without a listed DIAG correspondence cannot be directly configured for sensorless homing according to the table.

SPI Bus

SPI drivers such as the TMC5160 use the motherboard's hardware SPI bus. In the configuration, simply set spi_bus: spi2. There is no need to configure the MOSI/MISO/SCLK pins separately:

[tmc5160 stepper_x]
spi_bus: spi2
cs_pin: UART/CS pin of the corresponding driver

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
General Input / IO0	PD3	-
Probe / IO4	PB5	DRIVER3

Heating

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's built-in sensor_type options that can be connected directly, and suitable applications for each model: Thermistor Configuration Method

K-type thermocouples, PT100, etc., require additional conversion chips and cannot be connected directly 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	Remarks
PA8	Servo / BLTouch control

BL-Touch

Function	Pin
Servo Signal	PA8
Probe Signal	PB5

EXP Interface

EXP Configuration Reminder

• The EXP header is commonly used for displays such as the Mini12864 or for expanding peripherals.
• If a pin is already used by SPI, UART, endstop, fan, or other functions, do not configure it redundantly for EXP peripherals.

EXP1

Function	Pin
EXP1_1	NC
EXP1_2	PA15
EXP1_3	PC11
EXP1_4	PA14
EXP1_5	PC10
EXP1_6	PA13
EXP1_7	NC
EXP1_8	NC
EXP1_9	GND
EXP1_10	5V

EXP2

Function	Pin
EXP2_1	PB14
EXP2_2	PB13
EXP2_3	PC12
EXP2_4	PB12
EXP2_5	PB6
EXP2_6	PB15
EXP2_7	NC
EXP2_8	RST
EXP2_9	GND
EXP2_10	NC