树莓派风扇控制代码

autofan.py

#!/usr/bin/python3

import time

try:
    import RPi.GPIO as GPIO
except RuntimeError:
    print("Error importing RPi.GPIO!")

def cpu_temp():
    with open("/sys/class/thermal/thermal_zone0/temp", 'r') as f:
        return float(f.read())/1000

def main():
    channel = 14
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)

    # close air fan first
    GPIO.setup(channel, GPIO.OUT, initial=GPIO.LOW)
    is_close = True

    while True:
        temp = cpu_temp()
        output = ' '.join([str(time.ctime()), str(temp)])

        if is_close:
            if temp >= 65:
                GPIO.output(channel, GPIO.HIGH)
                is_close = False
        else:
            if temp < 55:
                GPIO.output(channel, GPIO.LOW)
                is_close = True

        if is_close:
            output += ' fan off'
        else:
            output += ' fan on'

        with open('/var/log/autofan.log', 'a+') as f:
            print(output, file=f)

        time.sleep(2.0)

if __name__ == '__main__':
    main()