Onboard 5V Fan Port

The Pi board features a controllable 5V interface for mainboard cooling. The wiring method is shown in the diagram below.

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Reference Configuration

[mcu host]                      # FlyOS has already generated the Linux MCU for you by default; define it to use it.
serial: /tmp/klipper_host_mcu

[temperature_sensor FLY-π]      # Host temperature
sensor_type: temperature_host

[temperature_fan core_fan]      # Host cooling fan
pin: host:gpiochip1/gpio106     # Host fan pin
max_power: 1.0
sensor_type: temperature_host   # Set to host mainboard temperature
control: watermark              # Control method
target_temp: 48                 # Host cooling fan activation temperature
min_temp: 0                     # Minimum temperature; an error will be reported below this temperature.
max_temp: 90                    # Maximum temperature; an error will be reported above this temperature.
off_below: 0.10
kick_start_time: 0.50
max_speed: 0.8                  # Maximum speed, 80% of full power operation.
min_speed: 0.3                  # Minimum speed, 30% of full power operation.