new_contents: # Sonar motion sensor script.
  # Detects movement using a Sonar module
  # 1/19/2016
  # Modifies from code provided by Vivek Kartha. 
  # 
  
  # Import required Python libraries
  import RPi.GPIO as GPIO
  import time
  GPIO.setmode(GPIO.BCM)                     #Set GPIO pin numbering 
  
  
  print "Sonar is activated, press Ctrl + c to exit."
  
  
  # Pins numbers: GPIO_4 = PIR OUT GPIO_17 = Ultra sonic echo GPIO_27 = Ultra sonic trig
  
  
  TRIG = 27                                 #Associate pin 23 to TRIG
  ECHO = 17                                  #Associate pin 24 to ECHO
  
  print "Distance measurement in progress"
  
  GPIO.setup(TRIG,GPIO.OUT)                  #Set pin as GPIO out
  GPIO.setup(ECHO,GPIO.IN)                   #Set pin as GPIO in
  
  while True:
  
      GPIO.output(TRIG, False)                 #Set TRIG as LOW
      print "Waitng For Sensor To Settle"
      time.sleep(2)                            #Delay of 2 seconds
  
      GPIO.output(TRIG, True)                  #Set TRIG as HIGH
      time.sleep(0.00001)                      #Delay of 0.00001 seconds
      GPIO.output(TRIG, False)                 #Set TRIG as LOW
  
      while GPIO.input(ECHO)==0:               #Check whether the ECHO is LOW
          pulse_start = time.time()              #Saves the last known time of LOW pulse
  
      while GPIO.input(ECHO)==1:               #Check whether the ECHO is HIGH
          pulse_end = time.time()                #Saves the last known time of HIGH pulse 
  
      pulse_duration = pulse_end - pulse_start #Get pulse duration to a variable
  
      distance = pulse_duration * 17150        #Multiply pulse duration by 17150 to get distance
      distance = round(distance, 2)            #Round to two decimal points
  
      if distance > 2 and distance < 400:      #Check whether the distance is within range
          print "Distance:",distance - 0.5,"cm"  #Print distance with 0.5 cm calibration
      else:
          print "Out Of Range"                   #display out of range
          
          
  except KeyboardInterrupt:
      
      print "  Quit";
  
      # Reset GPIO settings
      GPIO.cleanup()
subject: Add basic sonar scripts.