// C++ code
//

#include <ESP32Servo.h>
#include <LiquidCrystal_I2C.h>

int seconds = 0;


int x = 0;


LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

Servo servo_27;

Servo servo_26;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}


void setup() {
  LCD.init();
  LCD.backlight();
  pinMode(23, INPUT);
  pinMode(12, OUTPUT);
  pinMode(14, OUTPUT);
  servo_27.attach(27, 500, 2500);

  LCD.setCursor(0, 0);
  LCD.print("IoT Smart House");
  LCD.setCursor(0, 1);
  LCD.print("Door Is");
}

void loop()
{
  x = 0.01723 * readUltrasonicDistance(23, 23);
  if (x > 200) {
    digitalWrite(12, HIGH);
    digitalWrite(14, LOW);
    servo_27.write(90);
    LCD.setCursor(8, 1);
    LCD.print("Open  ");
  } else {
    digitalWrite(12, LOW);
    digitalWrite(14, HIGH);
    servo_27.write(0);
    LCD.setCursor(8, 1);
    LCD.print("Close");
  }
  delay(3000); // Wait for 3000 millisecond(s)
}