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).

Loading...

Interactive Pin Hotspots

The image below uses the product image of FLY-MMU and the same hotspot data. Use the device-type filters to show only compatible connectors; click a hotspot to see which devices it accepts, common Klipper configuration options, and notes. Hover to see the connector name and pins; 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-MMUMotor driversEndstopsServoRGB

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

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	-

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 power is on.

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

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

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