Pinout

Note

• This page lists the pinout of the FLY-C8 motherboard after flashing Klipper firmware. The pin numbers are based on the motherboard schematic.
• UART/CS is the driver communication pin: it functions 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. In Klipper configuration, it is typically active low (enable_pin with a ! 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-C8 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	PA5
DRIVER5	PE0	PC13	PC14	PB7	PA4
DRIVER6	PE7	PE11	PE10	PC15	PD15
DRIVER7	PE8	PA7	PA6	PE9	PA3

Power Off Operation

Before starting, completely shut down the printer and disconnect the power supply. Do not plug or unplug wiring harnesses, organize interface 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 driver's DIAG is connected to the corresponding input on the main controller. When enabling sensorless homing, configure diag_pin directly according to the table. The corresponding input will be occupied by the DIAG signal and should not be simultaneously connected to mechanical or optical endstops. 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. Simply configure spi_bus: spi1a in the configuration; there is no need to separately configure MOSI/MISO/SCLK pins:

[tmc5160 stepper_x]
spi_bus: spi1a
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 / 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	PA5	DRIVER4
Endstop Port 5 / IO5	PA4	DRIVER5
RGB / PWM	PD15	-
RGB / PWM	PA3	-
Probe	PC0	-

Heating

Function	Pin
Heated Bed	PB0
Heater Port 0	PD12
Heater Port 1	PD13
Heater Port 2	PD14

Temperature Sensors

Function	Pin
Heated Bed Thermistor	PC5
Thermistor Port 0	PC2
Thermistor Port 1	PC3
Thermistor Port 2	PC4

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 in Klipper that can be directly connected, along with applicable scenarios for each model：Thermistor Configuration Method

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

Fans

Function	Pin
Fan Port 0	PA0
Fan Port 1	PA1
Fan Port 2	PA2
Fan Port 3	PC6
Fan Port 4	PC7
Fan Port 5	PC8

PWM

The FLY-C8 provides 3 PWM output channels, which can be used for servos, fan speed control, etc.:

Pin	Remarks
PD15	RGB / Neopixel
PA3	RGB / Neopixel
PE6	Servo / BLTouch Control

BL-Touch

Function	Pin
Servo Signal	PE6
Probe Signal	PC0

RGB

Function	Pin
RGB0 / Neopixel	PD15
RGB1 / Neopixel	PA3