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control_fan.py
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control_fan.py
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#!/usr/bin/env python3
import os
from time import sleep
import RPi.GPIO as GPIO
pin = 18 # The pin ID, edit here to change it
maxTMP = 40 # The maximum temperature in Celsius after which we trigger the fan
def main():
try:
setup()
while True:
controlFan()
sleep(5)
except Exception:
GPIO.cleanup() # resets all GPIO ports used by this program
def setup():
GPIO.setmode(GPIO.BCM)
GPIO.setup(pin, GPIO.OUT)
GPIO.setwarnings(False)
return()
def getCPUtemperature():
temp = float(os.popen('vcgencmd measure_temp').readline().replace("temp=", "").replace("'C\n", ""))
return temp
def controlFan():
CPU_temp = getCPUtemperature()
if CPU_temp > maxTMP and not GPIO.output(pin):
GPIO.output(pin, True)
elif CPU_temp < (maxTMP-0.1*maxTMP) and GPIO.output(pin):
GPIO.output(pin, False)
return()
def setPin(mode): # A little redundant function but useful if you want to add logging
GPIO.output(pin, mode)
return()
if __name__ == "__main__":
main()