#!/usr/bin/python

import RPi.GPIO as GPIO

import time

 

channel =4 

data = []

j = 0

 

GPIO.setmode(GPIO.BCM)

 

time.sleep(1)

 

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, "*C, humidity :", humidity, "%"

else:

  print "wrong"

  print "temperature :", temperature, "*C, humidity :", humidity, "% check :", check, ", tmp :", tmp

#从这里开始是第二部分

mytemp = '%f' %temperature

myhumi = '%f' %humidity

 

tmp_output = open('/home/pi/pi/test/dht11/tmp_data.txt', 'w')

hud_output = open('/home/pi/pi/test/dht11/hum_data.txt', 'w')

 

tmp_output.write(mytemp)

hud_output.write(myhumi)

 

tmp_output.close

hud_output.close

GPIO.cleanup()