old_contents: #-----------------------------------------------------------------------
  #
  # Reads data from a DS18B20 temperature sensor
  #
  # The MIT License (MIT)
  #
  # Copyright (c) 2015 William De Freitas
  # 
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  # 
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  # 
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  #
  #-----------------------------------------------------------------------
  
  #!/usr/bin/env python
  
  #=======================================================================
  # Import modules
  #=======================================================================
  import os
  import sys
  import time
  
  
  #=======================================================================
  # LOAD DRIVERS
  #=======================================================================
  os.system('modprobe w1-gpio')
  os.system('modprobe w1-therm')
  
  
  #=======================================================================
  # READ RAW DATA FROM W1 SLAVE
  #=======================================================================
  def w1_slave_read(w1_device_path, device_id):
  
      device_id = w1_device_path+device_id+'/w1_slave'
  
      f=open(device_id,'r')
      lines=f.readlines()
      f.close()
  
      return lines
  
  
  #=======================================================================
  # READ DATA FROM DS18B20
  #=======================================================================
  def get_temp(w1_device_path, device_id):
  
      lines = w1_slave_read(w1_device_path, device_id)
  
      #If unsuccessful first read loop until temperature acquired
      while lines[0].strip()[-3:] != 'YES':
          time.sleep(0.2)
          print('Failed to read DS18B20. Trying again...')
          lines = w1_slave_read(device_id)
  
      temp_output = lines[1].find('t=')
  
      if temp_output != -1:
          temp_string = lines[1].strip()[temp_output+2:]
          temp_c = float(temp_string) / 1000.0
  
      return temp_c
  
new_contents: #-----------------------------------------------------------------------
  #
  # Reads data from a DS18B20 temperature sensor
  #
  # The MIT License (MIT)
  #
  # Copyright (c) 2015 William De Freitas
  # 
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  # 
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  # 
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  #
  #-----------------------------------------------------------------------
  
  #!/usr/bin/env python
  
  #=======================================================================
  # Import modules
  #=======================================================================
  import os
  import sys
  import time
  
  
  #=======================================================================
  # LOAD DRIVERS
  #=======================================================================
  os.system('modprobe w1-gpio')
  os.system('modprobe w1-therm')
  
  
  #=======================================================================
  # READ RAW DATA FROM W1 SLAVE
  #=======================================================================
  def w1_slave_read(w1_device_path, device_id):
  
      device_id = w1_device_path+device_id+'/w1_slave'
  
      f=open(device_id,'r')
      lines=f.readlines()
      f.close()
  
      return lines
  
  
  #=======================================================================
  # READ DATA FROM DS18B20
  #=======================================================================
  def get_temp(w1_device_path, device_id):
  
      lines = w1_slave_read(w1_device_path, device_id)
  
      #If unsuccessful first read loop until temperature acquired
      while lines[0].strip()[-3:] != 'YES':
          time.sleep(0.2)
          lines = w1_slave_read(device_id)
  
      temp_output = lines[1].find('t=')
  
      if temp_output != -1:
          temp_string = lines[1].strip()[temp_output+2:]
          temp_c = float(temp_string) / 1000.0
      else:
          temp_c = 999.99
  
      return temp_c
  
subject: Return error from DS18B20