#!/usr/bin/env python
# coding=utf-8

"""
Author: Christian Ashby
September 2016
@babelmonk
Thanks to: http://raspbrew.tumblr.com/post/44456213110/reading-temperatures-on-a-raspberry-pi-using
"""

from threading import Thread
import time
class Temp(Thread):
    """
     A class for getting the current temp of a DS18B20
    """
def __init__(self, fileName):
        Thread.__init__(self)
        self.tempDir = '/sys/bus/w1/devices/'
        self.fileName = fileName
        self.currentTemp = -999
        self.correctionFactor = 1;
        self.enabled = True
def run(self):
        while True:
            if self.isEnabled():
                try:
                    f = open(self.tempDir + self.fileName + "/w1_slave", 'r')
                except IOError as e:
                    print "Error: File " + self.tempDir + self.fileName + "/w1_slave" + " does not exist.";
                    return;
lines=f.readlines()
                crcLine=lines[0]
                tempLine=lines[1]
                result_list = tempLine.split("=")
temp = float(result_list[-1])/1000 # temp in Celcius
temp = temp + self.correctionFactor # correction factor
#if you want to convert to fahrenheit, uncomment this line
                #temp = (9.0/5.0)*temp + 32  
                
                if crcLine.find("NO") > -1:
                    temp = -999
self.currentTemp = temp
                #print "Current: " + str(self.currentTemp) + " " + str(self.fileName)
time.sleep(1)
#returns the current temp for the probe
    def getCurrentTemp(self):
        return self.currentTemp
#setter to enable this probe
    def setEnabled(self, enabled):
        self.enabled = enabled
    #getter       
    def isEnabled(self):
        return self.enabled