http://arduino.cc/en/Tutorial/Calibration
This example code is in the public domain.
+ Schema: Schema: https://learn.adafruit.com/assets/460
*/
// These constants won't change:
const int sensorPin = A0; // pin that the sensor is attached to
-const int ledPin = 9; // pin that the LED is attached to
+const int ledPin = 11; // pin that the LED is attached to
// variables:
int sensorValue = 0; // the sensor value