#include <LiquidCrystal.h> 
#include <LcdBarGraph.h>
#define max_distance 200

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 

LcdBarGraph lbg(&lcd, 16, 0, 1); 

const int trigPin = 9;
const int echoPin = 10;
long duration;
int distance;
int kled = 6;
int sled = 7;
int yled = 8;
int buzzer = 13;
int mesafe,sure;
void setup() 
{
  Serial.begin(9600);
  lcd.begin(16,2); // Initializes the interface to the LCD screen
  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(kled, OUTPUT);
  pinMode(yled, OUTPUT);
  pinMode(sled, OUTPUT);
  pinMode(buzzer, OUTPUT);

}

void loop() 
{digitalWrite(trigPin , HIGH);
delayMicroseconds(1000);
digitalWrite(trigPin , LOW);
sure = pulseIn(echoPin , HIGH);
mesafe = (sure/2) / 28.5;
Serial.print(mesafe);

 if (mesafe <= 10)
  {
    digitalWrite(kled, HIGH);
    digitalWrite(buzzer, HIGH);
    delay(50);
    digitalWrite(kled, LOW);
    digitalWrite(buzzer, LOW);
    delay(100);
  }

  else if ( mesafe <= 25)
  {
    digitalWrite(sled, HIGH);
    digitalWrite(buzzer, HIGH);
    delay(50);
    digitalWrite(sled, LOW);
    digitalWrite(buzzer, LOW);
    delay(500);
  }

  else if ( mesafe <= 50)
  {
    digitalWrite(yled, HIGH);
    digitalWrite(buzzer, HIGH);
    delay(50);
    digitalWrite(yled, LOW);
    digitalWrite(buzzer, LOW);
    delay(1000);
  }

  else
  {
    digitalWrite(yled, HIGH);
    delay(1000);
    digitalWrite(yled, LOW);
    delay(1000);
  }



  long duration,distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  
  distance= duration*0.034/2;

  

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

 
  lcd.setCursor(0,1);
  lbg.drawValue(distance, max_distance);
  delay(500);
}