import RPi.GPIO as GPIO
import time
def bin2dec(string_num):
return str(int(string_num, 2))
data = []
GPIO.setmode(GPIO.BCM)
GPIO.setup(4,GPIO.OUT)
GPIO.output(4,GPIO.HIGH)
time.sleep(0.025)
GPIO.output(4,GPIO.LOW)
time.sleep(0.02)
GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP)
for i in range(0,500):
data.append(GPIO.input(4))
bit_count = 0
tmp = 0
count = 0
HumidityBit = ""
TemperatureBit = ""
crc = ""
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"
