//Ricardo Arturo Turcios Alvarez
//0801200107064

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

Servo miServo;

const int trig = 9;
const int echo = 10;
const int led = 7;
const int servoMotor = 6;

long duracion;
float distancia;

LiquidCrystal lcd(12, 11, 5, 4, 3, A0);

void setup() {
  // put your setup code here, to run once:
  miServo.attach(servoMotor);

  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led, OUTPUT);

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

  lcd.begin(16, 2);
}

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

  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

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

  if (distancia < 15) {
    miServo.write(90);
    digitalWrite(led, HIGH);

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

    delay(3000);

    miServo.write(0);
    digitalWrite(led, LOW);
  } else {
    miServo.write(0);
    digitalWrite(led, LOW);

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

  delay(500);
}