#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int trigger = 6;   
int echo = 5;   
long duration;
long distance;
int buzzer = 3; 
int led = 13; 
int red= 11;
int green= 10;
int blue= 9;

void setup() {
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  
  Serial.begin(9600); 
  lightc(255,225,0);
  delay(3000);

  lcd.init();      // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
 
} //END SETUP ============

void loop() {

  myUltrasonic();  //CALL THE SELF DEFINED FUNCTION
  Serial.print("Distance: "); //FOR DEBUGGING
  Serial.println(distance);   //FOR DEBUGGING

  if (distance < 200) {
    tone(buzzer, 1000); 
    lightc(255,0,0);

  }  else{
     noTone(buzzer);
  }
 
 if(distance>200){
   lightc(0,255,0);
 }
 else{

 }

  lcd.setCursor(0, 0);
  lcd.print("distance");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  delay(500); 

} ////END LOOP ============

void myUltrasonic(){
  digitalWrite(trigger, LOW);
  delayMicroseconds(5);
  digitalWrite(trigger, HIGH);
  delayMicroseconds(13);
  digitalWrite(trigger, LOW);
  duration = pulseIn(echo, HIGH);
  distance = (duration * 0.0343) / 2;

} //END UNTRASONIC FUNCTION =====


void lightc(int r,int g,int b){
analogWrite(red,r);
analogWrite(green,g);
analogWrite(blue,b);
}// END LIGHTC FUNCTION==========