#include <LiquidCrystal_I2C.h>

#define LDR_PIN 3

LiquidCrystal_I2C lcd(0x27, 20, 4);




//define variables
#define trigerPin 12
#define echoPin 13
#define ledPin 2
#define speakerPin 10
#define pitch 262





double duration, distance;



void setup() {
  pinMode(LDR_PIN, INPUT);
  lcd.init();
  lcd.backlight();
  

  //setp for sensor
  Serial.begin(9600);
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  //setup for LED
  pinMode(ledPin, OUTPUT);
  //setup for speaker
  pinMode(speakerPin, OUTPUT);

  
}

void loop() {
  lcd.setCursor(3, 0);
  lcd.print("Room: ");
  if (digitalRead(LDR_PIN) == LOW) {
    lcd.print("Light!");
  } else {
    lcd.print("Dark  ");
  }
  delay(100);
  
    

  

  //looping sensor(create sound wave)
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  //get duration
  duration = pulseIn(echoPin, HIGH);
  //calculate distance
  distance = (duration / 2) * 0.0343;
  if (distance < 200) {
    digitalWrite(ledPin, HIGH);
    tone(speakerPin, pitch);
    delay(300);

    digitalWrite(ledPin, LOW);
    noTone(speakerPin);
    delay(300);
  }
  else {
    digitalWrite(ledPin, LOW);
    noTone(speakerPin);
  }
  

  }