Pinout

Note

• This page lists the pinout of the FLY-C5 motherboard after flashing Klipper firmware. Pin numbers are based on the motherboard 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 pin is multiplexed for both functions.
• 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-C5 provides 5 driver ports:

Driver	STEP	DIR	EN	UART/CS	DIAG
DRIVER0	PD1	PD0	PD3	PA15	PC7
DRIVER1	PD6	PD5	PD7	PD4	PA8
DRIVER2	PE1	PE0	PE2	PB7	PB6
DRIVER3	PE5	PE4	PE6	PE3	PC1
DRIVER4	PC15	PC14	PC0	PC13	PC2

Power Off Before Operation

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

DIAG and Sensorless Homing

The DIAG signals for DRIVER0–4 are independently connected to the main controller. When using sensorless homing, directly configure the diag_pin of the corresponding driver according to the DIAG row in the table above. These DIAG pins do not occupy the standard endstop ports listed above; the standard endstop ports can still be used as mechanical endstops or inputs according to your actual wiring.

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 the MOSI/MISO/SCLK pins:

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

Detailed explanation of software SPI and SPI speed, etc.: SPI Configuration Method

Endstops and Probe

Function	Pin	Corresponding Driver DIAG
Endstop Port 0 / IO0	PE9	-
Endstop Port 1 / IO1	PE10	-
Endstop Port 2 / IO2	PE11	-
Endstop Port 3 / IO3	PE12	-
Endstop Port 4 / IO4	PE13	-
Endstop Port 5 / IO5	PE14	-
DIAG	PC7	DRIVER0
DIAG	PA8	DRIVER1
DIAG	PB6	DRIVER2
DIAG	PC1	DRIVER3
DIAG	PC2	DRIVER4
Probe	PC5	-

Heaters

Function	Pin
Heated Bed Heater	PA0
Heater Port 0	PA6
Heater Port 1	PC6

Temperature Sensors

Function	Pin
Heated Bed Thermistor	PA3
Thermistor Port 0	PA4
Thermistor Port 1	PA1

Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default. It is recommended to configure sensor_type as Generic 3950.

List of Klipper's built-in sensor_type options that can be connected directly 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	PD15
Fan Port 1	PD14
Fan Port 2	PD13
Fan Port 3	PD12

PWM

The FLY-C5 provides 3 PWM outputs, which can be used for servos, fan speed control, etc.:

Pin	Note
PB0	Servo / BLTouch control
PB10	RGB / Neopixel
PE15	RGB / Neopixel

BL-Touch

Function	Pin
Servo Signal	PB0
Probe Signal	PC5

RGB

Function	Pin
RGB0 / Neopixel	PB10
RGB1 / Neopixel	PE15