title: ds18b20 temperature sensor and arduino
body: <p>I am currently writing this simple code to check the temp sensor</p>
  
  <pre><code>#include &lt;One Wire . h&gt;
  
  int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2
  
  //Temperature chip i/o
  OneWire ds(DS18S20_Pin); // on digital pin 2
  
  void setup(void) {
   Serial.begin(9600);
  }
  
  void loop(void) 
  {
   float temperature = getTemp();
   Serial.println(temperature);
  
   delay(100); //just here to slow down the output so it is easier to read
  
  }
  </code></pre>
  
  <p>I m getting "sketch_feb27a:14: error: 'getTemp' was not declared in this scope"<br>
  can someone tell me why?</p>