int laserPin = 8;
int sensor = A0;
int lectura;

void setup() {
  // put your setup code here, to run once:
  pinMode(laserPin, OUTPUT);
  Serial.begin(9600);
  digitalWrite(laserPin, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
  lectura = analogRead(sensor);
  Serial.println(lectura);
  if(lectura < 100){
    Serial.println("Alarma");}
}