title: Storing string from arduino to text file using python
body: <p>I am using this code to send a string from arduino to PC</p>
  
  <pre><code>int i=0;
  void setup(){  
    Serial.begin(9600);    // Open serial connection at a baud rate of 9600
    pinMode(13, OUTPUT);   //set pin13 in o/p mode
  }
  
  void loop(){ 
  while(1)
  {
  Serial.write("10.028371,76.328873"); 
  Serial.write('\0'); 
  delay(1000);
    }
  }
  </code></pre>
  
  <p>I need a python code that receives this string and store it in a text file as such.The arduino is transmitting this string continuously but i need it only once in the text file.
  I have written the below code but am getting only junk values in the text file</p>
  
  <pre><code>## import the serial library
  import serial
  
  ## Boolean variable that will represent 
  ## whether or not the arduino is connected
  connected = False
  
  ## establish connection to the serial port that your arduino 
  ## is connected to.
  
  locations=['/dev/ttyUSB0','/dev/ttyUSB1','/dev/ttyUSB2','/dev/ttyUSB3']
  
  for device in locations:
      try:
          print "Trying...",device
          ser = serial.Serial(device, 9600)
          break
      except:
          print "Failed to connect on",device
  
  ## loop until the arduino tells us it is ready
  while not connected:
      serin = ser.read()
      connected = True
  
  ## open text file to store the current 
  ##gps co-ordinates received from the rover    
  text_file = open("position4.txt", 'w')
  ## read serial data from arduino and 
  ## write it to the text file 'position.txt'
  while ser.read():
      x=ser.read()
      print(x) 
      if x=="\0":
        text_file.seek(0)
        text_file.truncate()   
      text_file.write(x)
      text_file.flush()
  ## close the serial connection and text file
  text_file.close()
  ser.close()
  </code></pre>