树莓派温控风扇脚本（使用三极管 s8050）

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#!/usr/bin/python
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#coding:utf-8
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import time
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import RPi.GPIO as GPIO
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#这里选择14（BCM）号针脚作为开关
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GPIO_OUT = 14
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def setup_GPIO():
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    GPIO.setmode(GPIO.BCM)
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    GPIO.setwarnings(False)
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    GPIO.setup(GPIO_OUT, GPIO.OUT)
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#开启风扇
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def start_fan():
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    GPIO.output(GPIO_OUT,GPIO.HIGH)
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#关闭风扇
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def stop_fan():
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    GPIO.output(GPIO_OUT,GPIO.LOW)
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#获取cpu温度
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def cpu_temp():
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    tempFile=open("/sys/class/thermal/thermal_zone0/temp")
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    cpu_temp=tempFile.read()
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    tempFile.close()
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    temp_c=(int(cpu_temp)/1000)
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    return int(temp_c)
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#若温度大于等于55度开启风扇，小于等于45度关闭扇。中间相差温度作为缓冲，不然风扇就会一会开一会关。
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def fen():
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    if cpu_temp()>=55:
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        start_fan()
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        fen_state(1)
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    elif cpu_temp()<=45:
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        stop_fan()
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        fen_state(0)
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    else:
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        pass
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def fen_state(state):
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    f=open("/etc/startup-script/state.txt")
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    file=f.readlines()
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    i=0
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    for line in file:
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        line = line.strip("\n")
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        v = line.split(":")
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        if v[0] == "fen_state":
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            file[i] = "fen_state:"+str(state)
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            break
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        i=i+1
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    f=open("/etc/startup-script/state.txt",'w+')
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    f.writelines(file)
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    f.close()
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if __name__ == '__main__':
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    setup_GPIO()
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    fen_state(0)
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    while True:
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        fen()
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        time.sleep(5)

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#!/usr/bin/env python
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# encoding: utf-8
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import RPi.GPIO as GPIO
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import time
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#以14号(BCM)阵脚为开关
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GPIO_OUT = 14
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(GPIO_OUT,GPIO.OUT)
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pwm = GPIO.PWM(GPIO_OUT, 100)
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speed=0
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prv_temp=0
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try:
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    while True:
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        tmpFile=open('/sys/class/thermal/thermal_zone0/temp')
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        cpu_temp=int(tmpFile.read())/1000
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        tmpFile.close()
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        if cpu_temp >= 34:
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            if prv_temp < 34:
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            # 启动时防止风扇卡死先全功率转0.1秒
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                pwm.start(0)
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                pwm.ChangeDutyCycle(100)
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                time.sleep(.1)
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            speed=min(cpu_temp, 100)
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            pwm.ChangeDutyCycle(speed)
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    else:
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        pwm.stop()
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    prv_temp=cpu_temp
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    time.sleep(5)
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except KeyboardInterrupt:
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    pass
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pwm.stop()