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 with TMC2209, used as chip select CS with 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 (prefix the enable_pin with !).
• 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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Interactive Pin Hotspots

The image below uses the FLY-C5 product image and the same hotspot data from the Klipper configuration generator. Use the device filters above to show only compatible connectors; click a hotspot to see compatible devices, common Klipper configuration sections, and notes. Use “Locate in pin table” in the detail panel to jump to and highlight the corresponding row below. Hover still shows the connector name and pin. Always verify the silkscreen and connector positions against the physical board and schematic.

Filter by deviceClick a device type to show only connectors that support it; click again to clear the filter.

FLY-C5Motor driversHeatersThermistorsFansEndstopsRGBProbe / servo

Hover to see the pin; click a hotspot to view compatible devices and configs. Pins can be copied from the detail panel, except for driver connectors.

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 shut down the printer and disconnect the power supply. Do not plug or unplug wiring harnesses, organize interface wiring, or touch terminals while the printer is powered on.

DIAG and Sensorless Homing

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

SPI Bus

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

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

Detailed explanation of software SPI, 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	-

For wiring of micro switches, optical endstops, proximity sensors, and TAP, see: Endstop Wiring Guide

Heaters

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

Temperature Sensors

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

Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default, with sensor_type recommended as Generic 3950; they also support 2-wire PT1000, configured by setting sensor_type to PT1000.

List of sensor_type options that can be directly connected internally by Klipper and their applicable scenarios: Thermistor Configuration Method

K-type thermocouples, 3-wire PT100, etc., require additional signal conditioning 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 output channels, which can be used for servos, fan speed control, etc.:

Pin	Notes
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

Screen / EXP Notes

Interface Notes

The FLY-C5 does not provide standard EXP1 / EXP2 12864 pin headers. Please use the board's TFT, FPC HDMI, HDMI, or UART screen interfaces. Do not apply the EXP1 / EXP2 pinout from other motherboards.

Interface	Pin / Description
UART Screen Interface	PA10 / PA9 / GND / 5V
TFT Screen Interface	FPC all-in-one interface
HDMI Screen Interface	HDMI / FPC HDMI

Screen Wiring and Configuration: View FLY-C5 Screen Documentation