15_dht11.py

#!/usr/bin/python

import RPi.GPIO as GPIO
import time

channel = 18
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, ", humidity : " , humidity
else:
	print "wrong"
	print "temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp

GPIO.cleanup()