#define ledPin 6
#define sensorPin A0
void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
}
void loop() {
  Serial.print("Analog output: ");
  Serial.println(readSensor());
  delay(500);
}
int readSensor() {
  unsigned int sensorValue = analogRead(sensorPin); 
  unsigned int outputValue = map(sensorValue, 0, 1023, 0, 255);
  if (outputValue > 65)
    analogWrite(ledPin, outputValue); 
  else
    digitalWrite(ledPin, LOW);
  return outputValue;     
}