（转载）树莓派连接dht11温度传感器获取温度(python)

参考原文地址：http://www.cnblogs.com/colipso/p/3535901.html

# -*- coding: utf-8 -*-

import RPi.GPIO as gpio
import time

PORT=13 #使用的树莓派的PIN13也就是GPIO27，根据自己连接位置更改此参数

gpio.setwarnings(False)
gpio.setmode(gpio.BOARD)
time.sleep(1)
data=[]
def delay(i): #20*i usdelay
    a=0
    for j in range(i):
        a+1
j=0

#start work
gpio.setup(PORT,gpio.OUT)
gpio.output(PORT,gpio.LOW)
time.sleep(0.02)
gpio.output(PORT,gpio.HIGH)
i=1

#wait to response
gpio.setup(PORT,gpio.IN)

while gpio.input(PORT)==1:
    continue

while gpio.input(PORT)==0:
    continue

while gpio.input(PORT)==1:
        continue

#get data
while j<40:
    k=0
    while gpio.input(PORT)==0:
        continue
    
    while gpio.input(PORT)==1:
        k+=1
        if k>100:break
    if k<3:
        data.append(0)
    else:
        data.append(1)
    j+=1

#get temperature
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 is ", temperature,"wet is ",humidity,"%"
else:
    print "something is worong the humidity,humidity_point,temperature,temperature_point,check is",humidity,humidity_point,temperature,temperature_point,check