Temp1-one_wire-DS18B20.py

#!/usr/bin/env python
#
# Raspberry Pi Class.
# David M. N. Bryan, dave@drstrangelove.net
#
# This is licend under creative commons license:
# http://creativecommons.org/licenses/by-nc-sa/3.0/
# Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
# 
# More info on wiring and what not can be found at: 
# http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c
#

import os
import glob
import time
from datetime import datetime

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:]
        temp_c = float(temp_string) / 1000.0
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c, temp_f
	
while True:
	temp=read_temp()
	print "Tempature in C:", temp[0], "Tempature in F:", temp[1], datetime.now().strftime('%Y-%m-%d %H:%M:%S')
	time.sleep(1)