树莓派 小屏幕_树莓派之温湿度传感器（dh11）控制小风扇

#!/usr/bin/python

import RPi.GPIO as GPIO

import time

while True:

channel = 20

data = []

j = 0

GPIO.setmode(GPIO.BCM)

time.sleep(1)

GPIO.setup(26,GPIO.OUT)

GPIO.setwarnings(False)

GPIO.setup(channel, GPIO.OUT)

GPIO.output(channel, GPIO.LOW)

time.sleep(0.02)

GPIO.output(channel, GPIO.HIGH)

GPIO.setup(channel, GPIO.IN)

while GPIO.input(channel) == GPIO.LOW:

continue

while GPIO.input(channel) == GPIO.HIGH:

continue

while j < 40:

k = 0

while GPIO.input(channel) == GPIO.LOW:

continue

while GPIO.input(channel) == GPIO.HIGH:

k += 1

if k > 100:

break

if k < 8:

data.append(0)

else:

data.append(1)

j += 1

print "sensor is working."

print data

humidity_bit = data[0:8]

humidity_point_bit = data[8:16]

temperature_bit = data[16:24]

temperature_point_bit = data[24:32]

check_bit = data[32:40]

humidity = 0

humidity_point = 0

temperature = 0

temperature_point = 0

check = 0

for i in range(8):

humidity += humidity_bit[i] * 2 ** (7 - i)

humidity_point += humidity_point_bit[i] * 2 ** (7 - i)

temperature += temperature_bit[i] * 2 ** (7 - i)

temperature_point += temperature_point_bit[i] * 2 ** (7 - i)

check += check_bit[i] * 2 ** (7 - i)

tmp = humidity + humidity_point + temperature + temperature_point

if check == tmp:

print "temperature : ", temperature, ", humidity : " , humidity

if temperature>=26:

print "open"

GPIO.output(26,GPIO.HIGH)

else:

print "close"

GPIO.output(26,GPIO.LOW)

else:

print "wrong"

print "temperature:", temperature, ",humidity: " , humidity, " check : ", check, " tmp : ", tmp

time.sleep(5)