ds18b20

[EagleEatApple]

import time
import datetime
import os
import glob
import sys

try:
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def read_temp_raw():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines

def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
return float(temp_string) / 1000.0

while True:
temp_c = read_temp()
temp_f = temp_c * 9.0 / 5.0 + 32.0
print datetime.datetime.now(),"Current Temperature is: %.2f" %read_temp(),"C %.2f" %temp_f,"F"
time.sleep(1)
except:
print '=================== error ================='
finally:
print '=================== stop =================='
sys.exit(1)