int sensorPin=A0; //select the input pin for the sensor
  int ledPin=9; // select the pin for the led
  int sensorValue = 0; // variable to store the value coming from the sensor

  void setup(){
    // declare the ledPin as an OUTPUT:
    pinMode(ledPin, OUTPUT);
    pinMode(sensorPin,INPUT);
    Serial.begin(9600);
  }

void loop(){
  //read the value form the sensor:
  sensorValue = analogRead(sensorPin);

  analogWrite(ledPin, sensorValue);

  //Print the value to the serial monitor
  Serial.println(sensorValue);
}