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Pinout

Note
  • This page lists the pinout of the FLY-D8 (H723) mainboard after flashing Klipper firmware. Pin numbers are based on the mainboard 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, which is typically active-low in Klipper configuration (enable_pin with the ! prefix).
  • 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:

DriverSTEPDIRENUART/CSDIAG
DRIVER0PE5PA8PA15PC9PD9
DRIVER1PE4PC11PC12PC10PD8
DRIVER2PE3PD1PD2PD0PD11
DRIVER3PE2PD4PD5PD3PD10
DRIVER4PE1PD7PB6PD6PA6
DRIVER5PE0PC13PC14PB7PA5
DRIVER6PE8PE12PE11PC15PD15
DRIVER7PE9PC4PA7PE10PA4
Power Off Before Operation

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

DIAG and Sensorless Homing

Rows in the table where the corresponding driver DIAG is not - indicate that the driver's DIAG signal is connected to the corresponding input pin on the main controller. When enabling sensorless homing, directly configure diag_pin according to the table. The corresponding input pin will be occupied by the DIAG signal; do not connect mechanical or optical endstops simultaneously. The RGB / PWM rows are not DIAG inputs and cannot be used for sensorless homing.

SPI Bus​

SPI drivers such as the TMC5160 use the mainboard's hardware SPI bus. Simply configure spi_bus: spi1a in the configuration — there is no need to configure the MOSI/MISO/SCLK pins individually:

[tmc5160 stepper_x]
spi_bus: spi1a
cs_pin: UART/CS pin of the corresponding driver

Detailed information on software SPI and SPI speeds: SPI Configuration Method

Endstops and Probe​

  • Please note that the RGB signal pins cannot be used as endstops; they can only be used as PWM ports.
FunctionPinCorresponding Driver DIAG
Endstop Port 0 / IO0PD9DRIVER0
Endstop Port 1 / IO1PD8DRIVER1
Endstop Port 2 / IO2PD11DRIVER2
Endstop Port 3 / IO3PD10DRIVER3
Endstop Port 4 / IO4PA6DRIVER4
Endstop Port 5 / IO5PA5DRIVER5
RGB / PWMPD15-
RGB / PWMPA4-
ProbePC0-

Heating​

FunctionPin
Heated BedPB1
Heater Port 0PD12
Heater Port 1PD13
Heater Port 2PD14

Temperature Sensors​

FunctionPin
Bed ThermistorPB0
Thermistor Port 0PC2
Thermistor Port 1PC3
Thermistor Port 2PC5
Supported Thermistor Types

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

List of built-in sensor_type options directly supported by 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​

FunctionPin
Fan Port 0PA1
Fan Port 1PA2
Fan Port 2PA3
Fan Port 3PC6
Fan Port 4PC7
Fan Port 5PC8

PWM​

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

PinNotes
PD15RGB / Neopixel
PA4RGB / Neopixel
PE6Servo / BLTouch control

BL-Touch​

FunctionPin
Servo SignalPE6
Probe SignalPC0

RGB​

FunctionPin
RGB0 / NeopixelPD15
RGB1 / NeopixelPA4

EXP Interface​

EXP Configuration Reminder
  • EXP headers are commonly used for screens like the Mini12864 or for expansion peripherals.
  • If a pin is already occupied by SPI, UART, endstop, fan, or other functions, do not configure it again for EXP peripherals.

EXP1​

FunctionPin
EXP1_1PB11
EXP1_2PE7
EXP1_3PA14
EXP1_4PA13
EXP1_5PB10
EXP1_6PE15
EXP1_7PE14
EXP1_8PA0
EXP1_9GND
EXP1_105V

EXP2​

FunctionPin
EXP2_1PB14
EXP2_2PB13
EXP2_3PA9
EXP2_4PB12
EXP2_5PA10
EXP2_6PB15
EXP2_7PE13
EXP2_8RST
EXP2_9GND
EXP2_10NC
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