Startup Fan Checker for Linux

This script runs at system startup/login and checks if a cooling fan is present on a Linux system.

If no fan is detected during startup, it shows a graphical prompt asking the user whether to shut down the system.

Features

• Detects fan presence via:
  • hwmon sensors
  • /boot/firmware/config.txt overlay (dtoverlay=gpio-fan)
  • dmesg logs
  • manually labeled GPIO pins
• If no fan is detected, shows a GUI confirmation dialog (via Zenity)
• Logs to /var/log/fan_check.log

Requirements

• Any Linux distribution with a graphical environment (X11 or Wayland)
• zenity installed (for the GUI window)
• shutdown command available

Installation

1. Install Zenity:

   sudo apt install zenity

2. Copy the script to a permanent location:

   sudo cp check_fan.sh /usr/local/bin/
   sudo chmod +x /usr/local/bin/check_fan.sh

3. To run on login (autostart), copy the desktop entry:

   mkdir -p ~/.config/autostart
   cp fan-check.desktop ~/.config/autostart/

Manual Execution

You can run the script manually at any time:

/usr/local/bin/check_fan.sh

Check the logs after executing.

Logging

All events and decisions are logged to:

/var/log/fan_check.log

License

MIT License