#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define echoPin 2 
#define trigPin 3
#define buzzer 7
#define buzz 6
#define green 8
#define orange 9
#define red 10
#define blue 11

long duration;
int distance;

void setup()
{
    lcd.init();
    lcd.backlight();
    pinMode(trigPin,OUTPUT);
    pinMode(echoPin, INPUT);
    pinMode(buzzer, OUTPUT);
    pinMode(buzz, OUTPUT);
    pinMode(red, OUTPUT);
    pinMode(blue, OUTPUT);
    pinMode(orange, OUTPUT);
    pinMode(green, OUTPUT);
    Serial.begin(9600); 
    Serial.println("Distance measurement using Arduino Uno");
    delay(500);
}

void loop()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.0344 / 2;
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance <=200 && distance >= 100){
    tone(buzz, 800);
    delay(1500);
    noTone(buzz);
    delay(1500);
    digitalWrite(orange, HIGH);

  }else{
    noTone(buzz);
    digitalWrite(orange, LOW);
  }


  if (distance < 100){
    digitalWrite(blue,HIGH);
    digitalWrite(blue, LOW);
    delay(50);
    digitalWrite(red,HIGH);
    digitalWrite(red, LOW);
    delay(50);
    tone(buzzer, 100);
    delay(100);
    noTone(buzzer);
    delay(100);
  }else{
    digitalWrite(blue,LOW);
    digitalWrite(red, LOW);
    noTone(buzzer);
  }


  if (distance > 200){
    digitalWrite(green, HIGH);
  }else{
    digitalWrite(green,LOW);
  }
  

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance:");
  lcd.setCursor(0,1);
  lcd.print(distance);
  lcd.setCursor(4, 1);
  lcd.print("cm");
  delay(100);
}