int SENSOR = A0;
int LED = 3;
int VALOR;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT);
  //pinMode(SENSOR, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  VALOR =analogRead(SENSOR);
  if (VALOR < 200){
    digitalWrite(LED, HIGH);
    delay(1000);
  }
  digitalWrite(LED,LOW);
  Serial.println(VALOR);

}