Onboard 5V Fan Port

Gemini has an onboard 5V controllable interface used for cooling the main controller. The wiring method is shown in the figure below

Reference Configuration

[mcu host]                      # FlyOS has already generated a Linux MCU by default, just define it to use
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 main controller temperature
control:watermark               # Control method
target_temp: 48                 # Host cooling fan activation temperature
min_temp: 0                     # Minimum temperature, errors will be reported if below this temperature
max_temp: 90                    # Maximum temperature, errors will be reported if above this temperature
off_below: 0.10
kick_start_time: 0.50
max_speed: 0.8                  # Maximum speed, 80% of full power
min_speed: 0.3                  # Minimum speed, 30% of full power