RFID_Toll_tax_collection

  #include <SPI.h>

#include <MFRC522.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <Servo.h>

#define SS_PIN 10

#define RST_PIN 9

MFRC522 rfid(SS_PIN, RST_PIN);

LiquidCrystal_I2C lcd(0x27, 16, 2);

Servo tollGate;

String card1 = "23222E28"; // Replace with actual UID

String card2 = "78E9F0G1H2"; // Replace with actual UID

int balance1 = 200;

int balance2 = 200;

int tollFee = 50;

void setup() {

    Serial.begin(9600);

    SPI.begin();

    rfid.PCD_Init();

    lcd.init();        // ✅ Fixed: Initialize LCD properly

    lcd.backlight();   // ✅ Fixed: Turn on LCD backlight

   

    lcd.setCursor(2, 0);

    lcd.print("RFID Toll Tax");

    delay(3000);

    lcd.clear();

    tollGate.attach(6);

    tollGate.write(0);

}

void loop() {

    if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) {

        return;

    }

    String readID = "";

    for (byte i = 0; i < rfid.uid.size; i++) {

        readID += String(rfid.uid.uidByte[i], HEX);

    }

    readID.toUpperCase();

    Serial.println("Card Detected: " + readID);

    lcd.clear();

    lcd.setCursor(0, 0);

   

    if (readID == card1) {

        processToll(balance1, "Card 1");

    } else if (readID == card2) {

        processToll(balance2, "Card 2");

    } else {

        lcd.print("Unauthorized Card");

        Serial.println("Unauthorized Card");

        delay(1500);

    }

    rfid.PICC_HaltA();

    rfid.PCD_StopCrypto1();

}

void processToll(int &balance, String cardName) {

    if (balance >= tollFee) {

        balance -= tollFee;

        lcd.print(cardName);

        lcd.setCursor(0, 1);

        lcd.print("Paid: Rs 50");

        Serial.println(cardName + " Paid Rs 50");

       

        tollGate.write(90);

        delay(2000);

        tollGate.write(0);

        lcd.clear();

        lcd.setCursor(0, 0);

        lcd.print("Bal: Rs " + String(balance));

        Serial.println("Remaining Bal: Rs " + String(balance));

    } else {

        lcd.print(cardName);

        lcd.setCursor(0, 1);

        lcd.print("Insufficient Bal");

        Serial.println(cardName + " Insufficient Balance");

    }

    delay(1500);

}