Pin Layout

Note

• This page lists the pin layout of the FLY-D7 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 same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is usually active low (with ! 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-D7 provides 7 driver ports:

Driver	STEP	DIR	EN	UART/CS	DIAG
DRIVER0	PC14	PC13	PC15	PB7	PB3
DRIVER1	PA1	PA0	PA2	PC3	PD2
DRIVER2	PA5	PA4	PA6	PA3	PA9
DRIVER3	PC5	PC4	PB0	PA7	PB4
DRIVER4	PB10	PB2	PB11	PB1	NC
DRIVER5	PC12	PB5	PC11	PB6	NC
DRIVER6	PA15	PA14	PA13	PC10	NC

Power Off Before Operation

Before starting, completely shut down the printer and disconnect the power supply. Do not plug or unplug cables, rearrange wiring, or touch terminals while the system is powered on.

DIAG and Sensorless Homing

In the table, rows where the Corresponding Driver DIAG is not - indicate that the driver DIAG pin 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, so do not connect mechanical or optical endstops simultaneously. Drivers without a listed DIAG mapping cannot be directly configured for sensorless homing based on the table.

SPI Bus

SPI drivers such as the TMC5160 use the motherboard's hardware SPI bus. In the configuration, simply set spi_bus: spi2. There is no need to configure the MOSI/MISO/SCLK pins separately:

[tmc5160 stepper_x]
spi_bus: spi2
cs_pin: Corresponding driver's UART/CS pin

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

Endstops and Probe

Function	Pin	Corresponding Driver DIAG
Endstop Port 0 / IO0	PB3	DRIVER0
Endstop Port 1 / IO1	PD2	DRIVER1
Endstop Port 2 / IO2	PA9	DRIVER2
Endstop Port 3 / IO3	PA10	-
Probe	PB4	DRIVER3

Heating

Function	Pin
Heater Port 0	PC6
Heater Port 1	PC7
Heater Port 2	PB12

Temperature Sensors

Function	Pin
Thermistor Port 0	PC0
Thermistor Port 1	PC1
Thermistor Port 2	PC2

Supported Thermistor Types

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

Function	Pin
Fan Port 0	PC8
Fan Port 1	PC9

PWM

The FLY-D7 provides 1 PWM output, which can be used for servos, fan speed control, etc.:

Pin	Remarks
PA8	Servo / BLTouch control

BL-Touch

Function	Pin
Servo Signal	PA8
Probe Signal	PB4

Screen / EXP Description

Interface Description

The FLY-D7 does not provide standard EXP1 / EXP2 12864 pin headers. The UART interface shown in the diagram is a serial expansion interface and is not equivalent to the 12864 EXP1 / EXP2 interfaces.

Interface	Pin
UART Interface	PA10 / PA9 / GND / 5V