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Pinout

Note
  • This page lists the pinout of the FLY-C8 mainboard after flashing Klipper firmware. The 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 (enable_pin with a ! prefix) in Klipper configuration.
  • 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:

DriverSTEPDIRENUART/CSDIAG
DRIVER0PE5PA8PA15PC9PD9
DRIVER1PE4PC11PC12PC10PD8
DRIVER2PE3PD1PD2PD0PD11
DRIVER3PE2PD4PD5PD3PD10
DRIVER4PE1PD7PB6PD6PA5
DRIVER5PE0PC13PC14PB7PA4
DRIVER6PE7PE11PE10PC15PD15
DRIVER7PE8PA7PA6PE9PA3
Power Off

Please completely power off the printer and disconnect the power supply before starting. Do not plug or unplug wiring harnesses, arrange interface wiring, or touch terminals while the printer is powered 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 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 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. Configure spi_bus: spi1a in the configuration; there is no need to configure MOSI/MISO/SCLK pins separately:

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

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

Endstops and Probe​

FunctionPinCorresponding Driver DIAG
Endstop Port 0 / IO0PD9DRIVER0
Endstop Port 1 / IO1PD8DRIVER1
Endstop Port 2 / IO2PD11DRIVER2
Endstop Port 3 / IO3PD10DRIVER3
Endstop Port 4 / IO4PA5DRIVER4
Endstop Port 5 / IO5PA4DRIVER5
RGB / PWMPD15-
RGB / PWMPA3-
ProbePC0-

Heaters​

FunctionPin
Heated Bed HeaterPB0
Heater Port 0PD12
Heater Port 1PD13
Heater Port 2PD14

Temperature Sensors​

FunctionPin
Heated Bed ThermistorPC5
Thermistor Port 0PC2
Thermistor Port 1PC3
Thermistor Port 2PC4
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 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 0PA0
Fan Port 1PA1
Fan Port 2PA2
Fan Port 3PC6
Fan Port 4PC7
Fan Port 5PC8

PWM​

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

PinRemarks
PD15RGB / Neopixel
PA3RGB / Neopixel
PE6Servo / BLTouch Control

BL-Touch​

FunctionPin
Servo SignalPE6
Probe SignalPC0

RGB​

FunctionPin
RGB0 / NeopixelPD15
RGB1 / NeopixelPA3

EXP Interface​

EXP Configuration Reminder
  • The EXP headers are commonly used for displays such as the Mini12864 or for expanding peripherals.
  • If a pin is already occupied by SPI, UART, endstop, fan, or other functions, do not configure it again for the EXP peripheral.

EXP1​

FunctionPin
EXP1_1PB10
EXP1_2PB1
EXP1_3PA14
EXP1_4PA13
EXP1_5PE15
EXP1_6PE14
EXP1_7PE13
EXP1_8PB11
EXP1_9GND
EXP1_105V

EXP2​

FunctionPin
EXP2_1PB14
EXP2_2PB13
EXP2_3PA9
EXP2_4PB12
EXP2_5PA10
EXP2_6PB15
EXP2_7PE12
EXP2_8RST
EXP2_9GND
EXP2_10NC
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