On-board 5V Fan Port

Gemini has an on-board 5V controllable interface for main controller cooling, as shown in the following diagram

Commands to be executed via SSH before adding configuration

• FAST system does not need this step

wget https://cnb.cool/3dmellow/public/static-files/-/git/raw/main/host/linux-dtb-current-fly-sunxi64_3.3.5_arm64.deb && sudo dpkg -i linux-dtb-current-fly-sunxi64_3.3.5_arm64.deb
sudo reboot

Reference Configuration

[mcu host]                      # FlyOS has already generated the linux MCU for you, define and use it directly           
serial: /tmp/klipper_host_mcu 

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


[temperature_fan core_fan]      # Host computer cooling fan
pin: host:gpiochip1/gpio103     # Host computer fan pin
max_power: 1.0
sensor_type: temperature_host   # Set to host controller temperature
control:watermark               # Control method
target_temp: 48                 # Host computer cooling fan start temperature
min_temp: 0                     # Minimum temperature, error will occur if below this
max_temp: 90                    # Maximum temperature, error will occur if above this
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