http://arduino.cc/en/Tutorial/AnalogInput
+ Schema: http://lab.piffa.net/schemi/potenziometro_bb.png
+
*/
-int sensorPin = A0; // select the input pin for the potentiometer
-int ledPin = 13; // select the pin for the LED
+const int sensorPin = A0; // select the input pin for the potentiometer
+const int ledPin = 13; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
void setup() {