Reading temperatures DS18B20

        #Getting temperatures from thermometers
        debug("Getting temperatures")
        try:
            terms = ["28-001414cf69ff","28-001414baa9ff","28-0014154b59ff","28-0014153bb1ff"]
            data = temps[:]
            for termid in range(4):
                term = terms[termid]
                for index in range(10):
                    debug("Trying to get temperature from "+term+" ("+str(index-1)+" attempt)");
                    #Be sure that thermometer exists
                    if os.path.exists("/sys/bus/w1/devices/"+term+"/w1_slave"):
                        #Read data from thermometer
                        debug("Reading temperature from "+term);
                        f = open("/sys/bus/w1/devices/"+term+"/w1_slave")
                        lines = f.readlines()
                        f.close()
                        #Parse it to readable format
                        debug("Parsing temperature from "+term);
                        index = lines[0].index("crc=")
                        if lines[0][index:].split(" ")[1].split("\n")[0] == "YES":
                            #CRC is correct, read temp
                            tmp = int(lines[1][lines[1].index("t=")+2:lines[1].index("\n")])/1000.0
                            if tmp > 35.0 or tmp < 0:
                                error("Failed to read temp, value out of range ("+str(tmp)+"C).")
                                time.sleep(3)
                            else:
                                debug("Got temperature from "+term+"! ("+str(tmp)+"C)");
                                data[termid] = tmp
                                break
                        else:
                            error("Failed to read temp, checksum is not valid")
                            time.sleep(3)
                    else:
                        error("Thermometer "+term+" doesn't exist!")
                        time.sleep(3)
            if(len(data) < 4):
                error("Failed to read temp from all thermometers")
            temps = data[:]
        except Exception, e:
            error("Exception while updating temps - "+str(e))