树莓派调温风扇脚本

gpio_fan.py

# !/usr/bin/python3
# encoding: utf-8

import RPi.GPIO
import time

RPi.GPIO.setwarnings(False)
RPi.GPIO.setmode(RPi.GPIO.BCM)
RPi.GPIO.setup(14, RPi.GPIO.OUT)

# 被动散热, 只有超过46.5°, 才开始转, 一上来就是满速, 然后随着温度降低, 转速降低, 直到降低温度到38.5°后, 停止风扇
hot = False

try:
    while True:
        tmpFile = open('/sys/class/thermal/thermal_zone0/temp')
        temp = int(tmpFile.read())
        tmpFile.close()
        if temp < 38500:
            hot = False
        if temp >= 46500:
            hot = True
        if hot:
            time.sleep(0.2)
            RPi.GPIO.output(14, RPi.GPIO.HIGH)
        if not hot:
            time.sleep(0.2)
            RPi.GPIO.output(14, RPi.GPIO.LOW)
        time.sleep(5)
except KeyboardInterrupt:
    pass
time.sleep(1)
RPi.GPIO.output(14, RPi.GPIO.LOW)