#include <LiquidCrystal.h> // LCD Library

#define LED_RED_PIN 6    // Red LED pin
#define LED_GREEN_PIN 7  // Green LED pin
#define BUZZER_PIN 4     // Buzzer pin
#define RELAY_PIN 11     // Relay control pin

LiquidCrystal lcd(13, 12, 10, 9, 8, 5); // LCD pins: RS, E, D4, D5, D6, D7

int count = 0;
char c;
String id;

int wait = 5000;

void setup()
{
  Serial.begin(9600);
  pinMode(LED_RED_PIN, OUTPUT);
  pinMode(LED_GREEN_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.println("RFID ATTENDANCE SYSTEM");

  lcd.begin(16, 2); // set up the LCD's number of columns and rows:
  lcd.setCursor(0, 0);
  lcd.print("SCAN CARD");
  lcd.setCursor(0, 1);
  lcd.print("NAME:       ");
}

void loop()
{
  while (Serial.available() > 0)
  {
    c = Serial.read();
    count++;
    id += c;
    if (count == 13)
    {
      Serial.print(id);
       
      if (id == "2311032010028")
      {
        Serial.println("[Attendance taken]");
        Serial.println("[NAME: SREEHAAS PENUGONDA]");
        Serial.println("[STUDENT ID: 2311032010028]");
        lcd.setCursor(0, 1);
        lcd.print("NAME: SREEHAAS ");
        digitalWrite(LED_GREEN_PIN, HIGH);
        digitalWrite(RELAY_PIN, HIGH);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(wait);
        digitalWrite(LED_GREEN_PIN, LOW);
        digitalWrite(RELAY_PIN, LOW);
        digitalWrite(BUZZER_PIN, LOW);
        lcd.setCursor(0, 0);
        lcd.print("SCAN CARD");
        lcd.setCursor(0, 1);
        lcd.print("NAME:            ");
      }
      else if (id == "2311032010036")
      {
        Serial.println("[Attendance taken]");
        Serial.println("[NAME: SUHAYB AHMED]");
        Serial.println("[STUDENT ID: 2311032010036]");
        lcd.setCursor(0, 1);
        lcd.print("NAME: SUHAYB ");
        digitalWrite(LED_GREEN_PIN, HIGH);
        digitalWrite(RELAY_PIN, HIGH);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(wait);
        digitalWrite(LED_GREEN_PIN, LOW);
        digitalWrite(RELAY_PIN, LOW);
        digitalWrite(BUZZER_PIN, LOW);
        lcd.setCursor(0, 0);
        lcd.print("SCAN CARD");
        lcd.setCursor(0, 1);
        lcd.print("NAME:            ");
      }
      else if (id == "2311032010058")
      {
        Serial.println("[Attendance taken]");
        Serial.println("[NAME: ADISH JUSTINE]");
        Serial.println("[STUDENT ID: 2311032010058]");
        lcd.setCursor(0, 1);
        lcd.print("NAME: ADISH ");
        digitalWrite(LED_GREEN_PIN, HIGH);
        digitalWrite(RELAY_PIN, HIGH);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(wait);
        digitalWrite(LED_GREEN_PIN, LOW);
        digitalWrite(RELAY_PIN, LOW);
        digitalWrite(BUZZER_PIN, LOW);
        lcd.setCursor(0, 0);
        lcd.print("SCAN CARD");
        lcd.setCursor(0, 1);
        lcd.print("NAME:            ");
      }
      else
      {
        Serial.println("[No DATA]");
        lcd.setCursor(0, 1);
        lcd.print("NAME: No DATA ");
        digitalWrite(LED_RED_PIN, HIGH);
        delay(wait);
        digitalWrite(LED_RED_PIN, LOW);
        lcd.setCursor(0, 0);
        lcd.print("SCAN CARD");
        lcd.setCursor(0, 1);
        lcd.print("NAME:           ");
      }
    }
  }
  count = 0;
  id = "";
  delay(500);
}