#include <Wire.h>
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27, 16, 2);
 int trigPin = 9;
 int echoPin = 10;
 long duration;
 int distance;
 int BlueLed = 3;
 int Buzzer = 5;


void setup() {
  // put your setup code here, to run once:
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);

  lcd.init();
  lcd.backlight();

  delay (100);

  lcd. setCursor (0, 0);
  lcd. print ("WELCOME ");
  lcd. setCursor (0, 1);
  lcd. print("Chioma :)");
   delay (1000);
  lcd.clear();

  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, HIGH); 
  delayMicroseconds(5);
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(5);

 duration = pulseIn(echoPin, HIGH);

 distance = duration*0.034/2;

 Serial.print("Distance:"); 
 Serial.println(distance);

lcd. setCursor(0, 0);
lcd.print(distance);
 lcd. print("cm");

 if (distance <= 100) {
 digitalWrite (3,HIGH);
 } 

 if (distance <= 100) {
  tone( Buzzer, 1000, 5000);
 }
  //; {
    //tone (Buzzer, 0, 5000);
  }