自动降温控制脚本

采用一个S9014型号的NPN型三极管，基极接在GPIO14口上。

#!/usr/bin/python2
#coding:utf8
import sys
import time
import os
try:
    import RPi.GPIO as GPIO
except RuntimeError:
    print("Error importing RPi.GPIO!  This is probably because you need superuser privileges.  You can achieve this by using 'sudo' to run your script")
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)
    GPIO.setup(channel, GPIO.OUT, initial=GPIO.LOW)
    is_close = True
    while True:
        temp = cpu_temp()
        if is_close:
            if temp >= 58.0:
                url = "http://tts.youdao.com/fanyivoice?word=开启风扇&le=zh&keyfrom=speaker-target"
                os.system('mplayer -loop 1 -softvol -softvol-max 100 "%s"' % url)
                GPIO.output(channel, 1)
                is_close = False
        else:
            if temp <= 40.0:
                url = "http://tts.youdao.com/fanyivoice?word=关闭风扇&le=zh&keyfrom=speaker-target"
                os.system('mplayer -loop 1 -softvol -softvol-max 100 "%s"' % url)
                GPIO.output(channel, 0)
                is_close = True
        time.sleep(10)
if __name__ == '__main__':
    main()

三极管的用法

树莓派GPIO