├── requirements.txt
├── script
    └── install
├── README.md
├── fancontrol.sh
└── fancontrol.py


/requirements.txt:
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1 | gpiozero==1.5.1
2 | RPi.GPIO==0.7.0
3 | 


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/script/install:
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 1 | #! /bin/sh
 2 | 
 3 | set -e
 4 | 
 5 | cd "$(dirname "$0")/.."
 6 | 
 7 | echo "=> Installing fan controller...\n"
 8 | sudo cp fancontrol.py /usr/local/bin/
 9 | sudo chmod +x /usr/local/bin/fancontrol.py
10 | 
11 | echo "=> Starting fan controller...\n"
12 | sudo cp fancontrol.sh /etc/init.d/
13 | sudo chmod +x /etc/init.d/fancontrol.sh
14 | 
15 | sudo update-rc.d fancontrol.sh defaults
16 | sudo /etc/init.d/fancontrol.sh start
17 | 
18 | echo "Fan controller installed."
19 | 


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/README.md:
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 1 | # Pi Fan Controller
 2 | 
 3 | Raspberry Pi fan controller.
 4 | 
 5 | ## Description
 6 | 
 7 | This repository provides scripts that can be run on the Raspberry Pi that will
 8 | monitor the core temperature and start the fan when the temperature reaches
 9 | a certain threshold.
10 | 
11 | To use this code, you'll have to install a fan. The full instructions can be
12 | found on our guide: [Control Your Raspberry Pi Fan (and Temperature) with Python](https://howchoo.com/g/ote2mjkzzta/control-raspberry-pi-fan-temperature-python).
13 | 


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/fancontrol.sh:
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 1 | #! /bin/sh
 2 | 
 3 | ### BEGIN INIT INFO
 4 | # Provides:          fancontrol.py
 5 | # Required-Start:    $remote_fs $syslog
 6 | # Required-Stop:     $remote_fs $syslog
 7 | # Default-Start:     2 3 4 5
 8 | # Default-Stop:      0 1 6
 9 | ### END INIT INFO
10 | 
11 | # Carry out specific functions when asked to by the system
12 | case "$1" in
13 |   start)
14 |     echo "Starting fancontrol.py"
15 |     /usr/local/bin/fancontrol.py &
16 |     ;;
17 |   stop)
18 |     echo "Stopping fancontrol.py"
19 |     pkill -f /usr/local/bin/fancontrol.py
20 |     ;;
21 |   *)
22 |     echo "Usage: /etc/init.d/fancontrol.sh {start|stop}"
23 |     exit 1
24 |     ;;
25 | esac
26 | 
27 | exit 0
28 | 


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/fancontrol.py:
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 1 | #!/usr/bin/env python3
 2 | 
 3 | import time
 4 | 
 5 | from gpiozero import OutputDevice
 6 | 
 7 | 
 8 | ON_THRESHOLD = 65  # (degrees Celsius) Fan kicks on at this temperature.
 9 | OFF_THRESHOLD = 55  # (degress Celsius) Fan shuts off at this temperature.
10 | SLEEP_INTERVAL = 5  # (seconds) How often we check the core temperature.
11 | GPIO_PIN = 17  # Which GPIO pin you're using to control the fan.
12 | 
13 | 
14 | def get_temp():
15 |     """Get the core temperature.
16 | 
17 |     Read file from /sys to get CPU temp in temp in C *1000
18 | 
19 |     Returns:
20 |         int: The core temperature in thousanths of degrees Celsius.
21 |     """
22 |     with open('/sys/class/thermal/thermal_zone0/temp') as f:
23 |         temp_str = f.read()
24 | 
25 |     try:
26 |         return int(temp_str) / 1000
27 |     except (IndexError, ValueError,) as e:
28 |         raise RuntimeError('Could not parse temperature output.') from e
29 | 
30 | if __name__ == '__main__':
31 |     # Validate the on and off thresholds
32 |     if OFF_THRESHOLD >= ON_THRESHOLD:
33 |         raise RuntimeError('OFF_THRESHOLD must be less than ON_THRESHOLD')
34 | 
35 |     fan = OutputDevice(GPIO_PIN)
36 | 
37 |     while True:
38 |         temp = get_temp()
39 | 
40 |         # Start the fan if the temperature has reached the limit and the fan
41 |         # isn't already running.
42 |         # NOTE: `fan.value` returns 1 for "on" and 0 for "off"
43 |         if temp > ON_THRESHOLD and not fan.value:
44 |             fan.on()
45 | 
46 |         # Stop the fan if the fan is running and the temperature has dropped
47 |         # to 10 degrees below the limit.
48 |         elif fan.value and temp < OFF_THRESHOLD:
49 |             fan.off()
50 | 
51 |         time.sleep(SLEEP_INTERVAL)
52 | 


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