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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int trigger = 6;   
int echo = 5;   

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

void setup() {
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);

  pinMode(buzzer, OUTPUT);
  
  Serial.begin(9600); 

  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, 600); 
    lightc(255,0,0)
  }else{
 noTone(buzzer);

  }
  
  if (distance < 200) {
  lightc(255,0,0);
  
  }
  else{
 
  }
  
  lcd.setCursor(0, 0);
  lcd.print("2c24 Mary Chiu he he");
  lcd.setCursor(0, 1);
  lcd.print("2024 Project");
  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==============