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Pinout

Note
  • This page lists the pinout of the FLY-Super8 motherboard after flashing Klipper firmware. The pin numbers are based on the motherboard schematic.
  • UART/CS is the driver communication pin: used as UART with TMC2209, and as chip select CS with SPI drivers such as TMC5160. The same pin is shared between these functions.
  • EN is the enable pin. In Klipper configuration, it is typically active-low (the enable_pin has a ! prefix).
  • DIAG is the driver diagnostic signal pin. When using sensorless homing, configure the corresponding diag_pin according to the table below. Some drivers may still require setting the DIAG jumper as described.
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Driver Pins​

The FLY-Super8 provides 8 driver ports:

DriverSTEPDIRENUART/CSDIAG
DRIVER0PE2PC5PF11PC4PG12
DRIVER1PE3PF13PF14PF12PG11
DRIVER2PE4PG0PG1PF15PG10
DRIVER3PE14PE8PE9PE7PG9
DRIVER4PE15PE11PF2PE10PD7
DRIVER5PE1PF0PC15PF1PD6
DRIVER6PE0PG3PG4PG2PA8
DRIVER7PE6PG6PG7PG5PF3
Power Off

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 system is powered on.

DIAG and Sensorless Homing

When using sensorless homing, the driver chip outputs a stall detection signal through the DIAG pin, which Klipper needs to read via the corresponding input port. The correspondence between DIAG and the endstop ports on this motherboard is as follows:

  • DRIVER0–6: The DIAG is directly connected to the corresponding endstop input port on the main MCU (DRIVERn → Endstop port n). There are no DIAG jumper pins on the board; the DIAG signal is always sent to the MCU. When enabling sensorless homing, directly configure the corresponding endstop port pin as diag_pin. Do not connect a physical endstop switch to that endstop port.
  • DRIVER7: The DIAG is not directly connected to an endstop port. You must manually install the adjacent DIAG jumper cap to route the DIAG signal to PF3 (the DIAG shared port) before sensorless homing can be used.

After enabling sensorless homing, the corresponding endstop port is occupied by the DIAG signal and must not have a mechanical or optical endstop switch connected simultaneously.

SPI Bus​

SPI drivers such as the TMC5160 use the motherboard's hardware SPI bus. In the configuration, simply set spi_bus: spi1a. 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 explanation of software SPI and SPI speed, etc.: SPI Configuration Method

Endstops and Probe​

FunctionPinCorresponding Driver DIAG
Endstop port 0 / IO0PG12DRIVER0
Endstop port 1 / IO1PG11DRIVER1
Endstop port 2 / IO2PG10DRIVER2
Endstop port 3 / IO3PG9DRIVER3
Endstop port 4 / IO4PD7DRIVER4
Endstop port 5 / IO5PD6DRIVER5
Endstop port 6 / IO6PA8DRIVER6
HV-IN / General InputPF3DRIVER7
IN / PWM_OUTPF8-
ProbePC3-

Heating​

FunctionPin
Heated BedPE5
Heater Port 0PB0
Heater Port 1PB1
Heater Port 2PC7
Heater Port 3PF7
Heater Port 4PF6

Temperature Sensors​

FunctionPin
Thermistor Port 0PF4
Thermistor Port 1PF5
Thermistor Port 2PF9
Thermistor Port 3PF10
Thermistor Port 4PC0
Thermistor Port 5PC1
Supported Thermistor Types

The thermistor ports support NTC thermistors (100K) by default. The recommended sensor_type configuration is Generic 3950.

List of Klipper built-in sensor_type options that can be directly connected and their applicable scenarios for each model: 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 3PA3
Fan Port 4PA15
Fan Port 5PB11
Fan Port 6PB10
Fan Port 7PD12
Fan Port 8PD14
Fan Port 9PD15

PWM​

The FLY-Super8 provides 2 PWM outputs, which can be used for servos, fan speed control, etc.:

PinNotes
PC6Servo / BLTouch control
PF8IN / PWM_OUT

BL-Touch​

FunctionPin
Servo SignalPC6
Probe SignalPC3

EXP Interface​

EXP Configuration Reminder
  • The EXP header is commonly used for screens like the Mini12864 or for expansion peripherals.
  • If a pin is already used by SPI, UART, endstop, fan, or other functions, do not configure it again for EXP peripherals.

EXP1​

FunctionPin
EXP1_1PE12
EXP1_2PE13
EXP1_3PB2
EXP1_4PG8
EXP1_5PC14
EXP1_6PC13
EXP1_7PG14
EXP1_8PG13
EXP1_9GND
EXP1_105V

EXP2​

FunctionPin
EXP2_1PA6
EXP2_2PA5
EXP2_3PB7
EXP2_4PA4
EXP2_5PB6
EXP2_6PA7
EXP2_7PG15
EXP2_8RST
EXP2_9GND
EXP2_10NC
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