Pin Mapping

Note

• This page lists the pin mapping of the FLY-D8 (H723) 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 with SPI drivers such as TMC5160. The same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is usually 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-D8 (H723) provides 8 driver ports:

Driver	STEP	DIR	EN	UART/CS	DIAG
DRIVER0	PE5	PA8	PA15	PC9	PD9
DRIVER1	PE4	PC11	PC12	PC10	PD8
DRIVER2	PE3	PD1	PD2	PD0	PD11
DRIVER3	PE2	PD4	PD5	PD3	PD10
DRIVER4	PE1	PD7	PB6	PD6	PA6
DRIVER5	PE0	PC13	PC14	PB7	PA5
DRIVER6	PE8	PE12	PE11	PC15	PD15
DRIVER7	PE9	PC4	PA7	PE10	PA4

Power Off Operation

Before starting, completely turn off the printer and disconnect the power supply. Do not plug or unplug wiring, organize cable connections, 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 driver's DIAG pin is connected to the corresponding input port on the main controller. When enabling sensorless homing, configure diag_pin directly according to the table. The corresponding input port will be occupied by the DIAG signal; do not connect mechanical or optical endstop switches simultaneously. The RGB / PWM row is not a DIAG input and cannot be used for sensorless homing.

SPI Bus

SPI drivers such as the TMC5160 use the motherboard's hardware SPI bus. In the configuration, simply set spi_bus: spi1a; there is no need to configure MOSI/MISO/SCLK pins separately:

[tmc5160 stepper_x]
spi_bus: spi1a
cs_pin: Corresponding driver's UART/CS pin

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

Endstops and Probe

• Please note that RGB signal pins cannot be used for endstops; they can only be used as PWM ports.

Function	Pin	Corresponding Driver DIAG
Endstop port 0 / IO0	PD9	DRIVER0
Endstop port 1 / IO1	PD8	DRIVER1
Endstop port 2 / IO2	PD11	DRIVER2
Endstop port 3 / IO3	PD10	DRIVER3
Endstop port 4 / IO4	PA6	DRIVER4
Endstop port 5 / IO5	PA5	DRIVER5
RGB / PWM	PD15	-
RGB / PWM	PA4	-
Probe	PC0	-

Heating

Function	Pin
Heated Bed	PB1
Heater Port 0	PD12
Heater Port 1	PD13
Heater Port 2	PD14

Temperature Sensors

Function	Pin
Bed Thermistor	PB0
Thermistor Port 0	PC2
Thermistor Port 1	PC3
Thermistor Port 2	PC5

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 compatible with Klipper and their applicable scenarios: Thermistor Configuration Method

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	PA1
Fan Port 1	PA2
Fan Port 2	PA3
Fan Port 3	PC6
Fan Port 4	PC7
Fan Port 5	PC8

PWM

The FLY-D8 (H723) provides 3 PWM outputs, which can be used for servos, fan speed control, etc.:

Pin	Notes
PD15	RGB / Neopixel
PA4	RGB / Neopixel
PE6	Servo / BLTouch control

BL-Touch

Function	Pin
Servo Signal	PE6
Probe Signal	PC0

RGB

Function	Pin
RGB0 / Neopixel	PD15
RGB1 / Neopixel	PA4