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Raspberry PI Fan Controller

To install run:

curl -Ls "https://git.io/JU4cX" |bash -
#!/bin/bash
curl -Ls "https://gist.githubusercontent.com/mattrude/a8666cf2e3035d3644a1def86e48eea6/raw/raspi-fan-control.py" -o /usr/local/bin/raspi-fan-control.py && \
curl -Ls "https://gist.githubusercontent.com/mattrude/a8666cf2e3035d3644a1def86e48eea6/raw/raspi-fan-control.service" -o /etc/systemd/system/raspi-fan-control.service && \
sudo systemctl enable raspi-fan-control.service && sudo systemctl start raspi-fan-control.service
#!/usr/bin/env python3
import subprocess
import syslog
import time
from gpiozero import OutputDevice
ON_THRESHOLD = 64 # (degrees Celsius) Fan kicks on at this temperature.
OFF_THRESHOLD = 56 # (degress Celsius) Fan shuts off at this temperature.
SLEEP_INTERVAL = 5 # (seconds) How often we check the core temperature.
GPIO_PIN = 17 # Which GPIO pin you're using to control the fan.
def get_temp():
output = subprocess.run(['vcgencmd', 'measure_temp'], capture_output=True)
temp_str = output.stdout.decode()
try:
return float(temp_str.split('=')[1].split('\'')[0])
except (IndexError, ValueError):
raise RuntimeError('Could not parse temperature output.')
if __name__ == '__main__':
# Validate the on and off thresholds
if OFF_THRESHOLD >= ON_THRESHOLD:
raise RuntimeError('OFF_THRESHOLD must be less than ON_THRESHOLD')
fan = OutputDevice(GPIO_PIN)
while True:
temp = get_temp()
# Start the fan if the temperature has reached the limit and the fan
# isn't already running.
# note: `fan.value` returns 1 for "on" and 0 for "off"
if temp > ON_THRESHOLD and not fan.value:
fan.on()
syslog.syslog("Case fan turned ON, current cpu temperature is: %0.0f c " % temp)
# Stop the fan if the fan is running and the temperature has dropped
# to 10 degrees below the limit.
elif fan.value and temp < OFF_THRESHOLD:
fan.off()
syslog.syslog("Case fan turned OFF, current cpu temperature is: %0.0f c " % temp)
time.sleep(SLEEP_INTERVAL)
[Unit]
Description=Raspberry Pi Fan Controller
StartLimitIntervalSec=0
[Service]
Type=simple
ExecStart=/usr/bin/python3 /usr/local/bin/raspi-fan-control.py
Restart=always
RestartSec=1
[Install]
WantedBy=multi-user.target
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