read_dht11.py

#!/usr/bin/python

import RPi.GPIO as GPIO
import time

GPIO_PIN = 10
 
def bin2dec(string_num):
	return str(int(string_num, 2))

data = []
 
GPIO.setmode(GPIO.BCM)
GPIO.setup(GPIO_PIN, GPIO.OUT)
GPIO.output(GPIO_PIN, GPIO.HIGH)
time.sleep(0.025)
GPIO.output(GPIO_PIN, GPIO.LOW)
time.sleep(0.02)
GPIO.setup(GPIO_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)

for i in range(0,500):
	data.append(GPIO.input(GPIO_PIN))

bit_count = 0
tmp = 0
count = 0
HumidityBit = ""
TemperatureBit = ""
crc = ""

print(data)

try:
	while data[count] == 1:
		tmp = 1
		count = count + 1

	for i in range(0, 32):
		bit_count = 0

		while data[count] == 0:
			tmp = 1
			count = count + 1

		while data[count] == 1:
			bit_count = bit_count + 1
			count = count + 1

		if bit_count > 3:
			if i>=0 and i<8:
				HumidityBit = HumidityBit + "1"
			if i>=16 and i<24:
				TemperatureBit = TemperatureBit + "1"
		else:
			if i>=0 and i<8:
				HumidityBit = HumidityBit + "0"
			if i>=16 and i<24:
				TemperatureBit = TemperatureBit + "0"

except:
	print "ERR_RANGE"
	exit(0)
 
try:
	for i in range(0, 8):
		bit_count = 0

		while data[count] == 0:
			tmp = 1
			count = count + 1
 
		while data[count] == 1:
			bit_count = bit_count + 1
			count = count + 1

		if bit_count > 3:
			crc = crc + "1"
		else:
			crc = crc + "0"
except:
	print "ERR_RANGE"
	exit(0)
 
Humidity = bin2dec(HumidityBit)
Temperature = bin2dec(TemperatureBit)
 
if int(Humidity) + int(Temperature) - int(bin2dec(crc)) == 0:
	print "Humidity:"+ Humidity +"%"
	print "Temperature:"+ Temperature +"C"
else:
	print "ERR_CRC"