//José Carlos Cáceres Girón (0703-2006-03787)

#include <LiquidCrystal.h>
#include <Servo.h>

LiquidCrystal lcd(12,11,5,4,3,2);
Servo miServo;

int led = 13;
const int trigPin = 9;
const int echoPin = 10;
long duracion;
float distancia;

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16,2);
  miServo.attach(8);
  pinMode(led, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  miServo.write(0);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  duracion = pulseIn(echoPin, HIGH);
  distancia = duracion * 0.034 / 2;

  Serial.print("Distancia: ");
  Serial.print(distancia);
  Serial.println(" cm");

  if(distancia < 15){

    miServo.write(90);
    digitalWrite(led, HIGH);

    lcd.setCursor(0,0);
    lcd.print("Acceso         ");

    lcd.setCursor(0,1);
    lcd.print("Permitido      ");

    delay(3000);
    miServo.write(0);
    digitalWrite(led, LOW);

  }
  else{

    lcd.setCursor(0,0);
    lcd.print("Esperando      ");

    lcd.setCursor(0,1);
    lcd.print("Usuario        ");

  }

  delay(500);

}