Pin Distribution

Note

• This page lists the pin distribution of the FLY-ERCF V2 toolboard after flashing the Klipper firmware. The pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: it serves as UART when using TMC2209 and as chip select CS when using SPI drivers; the same pin is multiplexed.
• EN is the enable pin, which is typically active low in Klipper configuration (with a ! prefix in enable_pin).

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Interactive Pin Hotspots

The image below uses the product image of FLY-ERCF V2 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-ERCF V2Motor driversEndstopsServoextra

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.

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio4	gpio3	gpio5	gpio2	-
DRIVER1	gpio7	gpio8	gpio6	gpio9	-

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 Port 0	gpio20
Endstop Port 1	gpio15

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

Servo

Function	Pin
Servo 0	gpio21

Expansion Output

Function	Pin
EXTRA / General Purpose Output	gpio14

PWM

PWM Function	Pin
Servo 0	gpio21
EXTRA / General Purpose Output	gpio14