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


LiquidCrystal_I2C lcd(0x27, 16, 2);
#define buzzer 7
#define in 8
#define out 9

int count = 0;
int maxPerson = 6;

byte smiley[] = {
  B00000,
  B00000,
  B01010,
  B01010,
  B00000,
  B10001,
  B01110,
  B00000
};

void setup() {
 lcd.begin(16,2);
 pinMode(in, INPUT);
 pinMode(out, INPUT);
 pinMode(buzzer, OUTPUT);
 lcd.init();
 lcd.backlight();
 lcd.setCursor(2,0);
 lcd.print("WELCOME TO");
 lcd.setCursor(1,1);
 lcd.print("HUMAN COUNTER");
 lcd.createChar(1, smiley);
 lcd.setCursor(14,1);
 lcd.write(1);
 delay(1500);
}

void loop() {
 while (count >= 0) {                         //para tuloy tuloy ang counting. nag lo-loop sya.
    int in_value = digitalRead(in);
    int out_value = digitalRead(out);

    if (in_value == LOW) {                    //if statement tells that hanggat low yung value sa in, naka stay put lang sya hanggang sa tumaas
      count++;                                // pag tumaas ang value, add 1
      tone(buzzer, 1030);                     // Then buzzer plays On 
      delay(100);
      noTone(7);       
      lcd.clear();
      lcd.setCursor(1,0);
      lcd.print("Person In Room:");
      lcd.setCursor(7,1);
      lcd.print(count);
      delay(1000);
    }

    if (out_value == LOW && count > 0) {     //if statement tells that hanggat low yung value sa out, naka stay put lang sya hanggang sa tumaas | greater than 0 para hindi mag negative 
      count--;                               // pag tumaas ang value, minus 1
      tone(buzzer, 50);                     // Then buzzer plays On 
      delay(100);
      noTone(7);       
      lcd.clear();
      lcd.setCursor(1,0);
      lcd.print("Person In Room:");
      lcd.setCursor(7,1);
      lcd.print(count);
      delay(1000);
    }           	                                 

    if (count == 0) {                       //if statement tells that pag equal to 0 yung value
      lcd.clear();
      lcd.setCursor(3,0);
      lcd.print("NOBODY IS");               // this text displayed
      lcd.setCursor(2,1);
      lcd.print("IN THE ROOM");             // same as this one
      delay(200);
    }

    if (count >= maxPerson) {             //if statement tells that pag yung count ay mataas or katulad ng declared value ng maxPerson which is (6)
      tone(buzzer, 1030);                 // Then buzzer plays On 
      delay(100);
      noTone(7);                         // Then Off (it plays On and off in loop)
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("CAPACITY REACHED");     // this text displayed
      lcd.setCursor(2,1);
      lcd.print("WAIT OUTSIDE");          // same as this one
    }
    
    else{
    noTone(7);                           // if it is less than 6 (buzzer Off)
    }
 }
}