#!/usr/bin/python
import httplib, urllib
import os
import glob
import time

def doit():

 def read_B18_Raw():
    os.system('modprobe w1-gpio')
    os.system('modprobe w1-therm')
    Params = urllib.urlencode({'field1': temp_f, 'key':'my key'})
    Headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
    conn = httplib.HTTPConnection("api.thingspeak.com:80")

    base_dir = '/sys/bus/w1/devices/'
    device_folder = glob.glob(base_dir + '28*')[0]
    device_file = device_folder + '/w1_slave'
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

 def read_B18():
    lines = read_B18_Raw()
    while lines[0].strip()[-3:] != 'YES':
            time.sleep(0.2)
            lines = read_B18_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 "%.1f" % (temp_f)

	try:
		conn.request("POST", "/update", params, headers)
		response = conn.getresponse()
		print temp_f
		data = response.read()
		temp_f = read_temp()
		conn.close()
	except:
		print "connection failed"

#sleep for 16 seconds (api limit of 15 secs)
if __name__ == "__main__":
	temp_f = 0
	while True:
		doit()
		time.sleep(16)