// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
   Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  //read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  float voltage = sensorValue * (5.0/1023.0);
  int brightness = sensorValue/4;
  // 1023/4 = 255.75 but the .75 cuts off

  analogWrite(11, brightness);
  // print out the value you read:
  Serial.print ("ADC reading: ");
  Serial.print(sensorValue);
  Serial.print("Analog voltage: ");
  Serial.println(voltage);
  delay(1);       // delay in between reads for stability 
}