#include <LiquidCrystal.h>
int sensor = 0;
int LED = 4;
int LED2 = 2;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  lcd.begin(16, 2);
  pinMode(LED,OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  lcd.setCursor(0, 0);
  delay(3000);
  sensor = random(100);
  lcd.print("Valor= ");
  lcd.print(sensor);

  if(sensor >= 50){
    digitalWrite(LED, HIGH);
    digitalWrite(LED2, LOW);
    lcd.println(" Alerta");

  }else{
    digitalWrite(LED, LOW);
    digitalWrite(LED2, HIGH);
    lcd.println(" Normal");

  }
  if (sensor<101){
    lcd.setCursor(0, 1);;
  }
  }