Pinout

Note

• This page lists the pinout of the FLY-MMU tool board after flashing Klipper firmware. Pin numbers are subject to the product schematic.
• UART/CS is the driver communication pin: used as UART with TMC2209, or as chip select CS with SPI drivers; the same pin is multiplexed.
• EN is the enable pin. In Klipper configuration, it is typically active low (with ! prefix in enable_pin).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	PE14	PE13	PE12	PE11	-
DRIVER1	PC5	PB1	PB0	PE7	-
DRIVER2	PC4	PA6	PA7	PA5	-
DRIVER3	PE4	PE6	PE5	PC13	-

Endstops

Function	Pin
Endstop 0	PD3
Endstop 1	PD4
Endstop 2	PD5
Endstop 3	PD6
Endstop 4	PD7
Endstop 5	PC0
Endstop 6	PC1
Endstop 7	PC2
Endstop 8	PC3
Endstop 9	PE3
Endstop 10	PE2

Servos

Function	Pin
Servo 0	PA3
Servo 1	PA2
Servo 2	PA1
Servo 3	PA0

RGB

Function	Pin
RGB	PE10
TP LED / Neopixel	PA8

Fans / Expansion Outputs

Function	Pin
FAN0	PA0
FAN1	PA1
FAN2	PA2
FAN3	PA3

PWM

PWM Function	Pin
Servo 0 / FAN3	PA3
Servo 1 / FAN2	PA2
Servo 2 / FAN1	PA1
Servo 3 / FAN0	PA0
RGB	PE10
TP LED / Neopixel	PA8