#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows


int ledPin = 16;                // choose the pin for the LED
int buzzerPin = 17;             // choose the pin for the buzzer
int inputPin = 4;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(buzzerPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input

  lcd.init(); // initialize the lcd
  lcd.backlight();  
  lcd.setCursor(6, 0);      // move cursor to   (6, 0)
  lcd.print("IOT");         // print message at (6, 0)
  lcd.setCursor(4, 1);      // move cursor to   (0, 1)
  lcd.print("PIR Sensor");     // print message at (0, 1)
  delay(2000);              // display the above for two seconds
  lcd.clear();              // clear display

}

void loop() {
  // put your main code here, to run repeatedly:
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    
    if (pirState == LOW) {
      // we have just turned on
      analogWrite(buzzerPin, 123);  // turn buzzer ON
      Serial.println("Motion detected!");
      lcd.setCursor(0, 0);
      lcd.print("Motion detected!");
      lcd.setCursor(0, 1);
      lcd.print("LED = ON ");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW); // turn LED OFF
    analogWrite(buzzerPin, 0);  // turn buzzer OFF
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      lcd.setCursor(0, 0);
      lcd.print("Motion ended!         ");
      lcd.setCursor(0, 1);
      lcd.print("LED = OFF");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}