Ticksy - Smart RFID Bus Ticketing System

1#include <SPI.h>
2#include <MFRC522.h>
3#include <Wire.h>
4#include <LiquidCrystal_I2C.h>
5#include <Servo.h>
6
7// Pins
8#define SS_PIN 10
9#define RST_PIN 9
10#define SERVO_PIN 6
11
12// Components
13MFRC522 mfrc522(SS_PIN, RST_PIN);
14LiquidCrystal_I2C lcd(0x27, 16, 2);
15Servo myServo;
16
17// Users data
18#define NUM_USERS 6
19struct User {
20  byte uid[4];
21  String name;
22  float balance;
23};
24
25User users[NUM_USERS] = {
26
27};
28
29void setup() {
30  Serial.begin(9600);
31  SPI.begin();
32  mfrc522.PCD_Init();
33  lcd.init();
34  lcd.backlight();
35  myServo.attach(SERVO_PIN);
36  myServo.write(0);
37  randomSeed(analogRead(0));
38  
39  // Welcome sequence
40  lcd.clear();
41  lcd.print("Hello!");
42  delay(1000);
43  lcd.setCursor(0, 1);
44  lcd.print("Welcome to Bus");
45  delay(2000);
46  lcd.clear();
47  lcd.print("Please Tap Your");
48  lcd.setCursor(0, 1);
49  lcd.print("Card/Keychain");
50}
51
52void loop() {
53  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
54    processRFID();
55    delay(500); // Debounce
56  }
57}
58
59void processRFID() {
60  int userIndex = findUserIndex(mfrc522.uid.uidByte);
61  
62  if (userIndex != -1) {
63    // Valid user - check balance first
64    float fee = random(10, 51);
65    
66    if (users[userIndex].balance >= fee) {
67      // Sufficient balance
68      myServo.write(180); // Open gate
69      users[userIndex].balance -= fee;
70
71      // Display
72      lcd.clear();
73      lcd.print("Hello! "+users[userIndex].name);
74      lcd.setCursor(0, 1);
75      lcd.print("Paid:rs " + String(fee, 2));
76      delay(1500);
77      lcd.setCursor(0, 1);
78      lcd.print(" Bal:rs " + String(users[userIndex].balance, 2));
79
80      // Serial output
81      Serial.print(users[userIndex].name + ",");       // Name
82      Serial.print(String(fee, 2) + ",");             // Fee
83      Serial.print(String(users[userIndex].balance, 2) + ","); // Balance
84      printUID(mfrc522.uid.uidByte);                   // UID
85      Serial.println(",ACCESS_GRANTED");     
86      delay(1500);
87      lcd.clear();
88      lcd.setCursor(0,0);
89      lcd.print("Thanks For using");
90      delay(500);
91      lcd.setCursor(0,1);
92      lcd.print("Our Bus service");
93      delay(1000);
94      lcd.clear();
95      lcd.setCursor(0,0);
96      lcd.print("Enjoy your Ride!");
97
98      delay(2000);
99      myServo.write(0); // Close gate
100    } else {
101      // Insufficient balance
102      lcd.clear();
103      lcd.print("Not Enough Funds!");
104      lcd.setCursor(0, 1);
105      lcd.print("Bal:rs " + String(users[userIndex].balance, 2));
106      
107      Serial.print("Insufficient balance for ");
108      printUID(mfrc522.uid.uidByte);
109      Serial.println(" - " + users[userIndex].name);
110      
111      delay(2000);
112    }
113    showWelcomeMessage(); // Return to welcome
114  } else {
115    // Invalid
116    lcd.clear();
117    lcd.print("Invalid Card!");
118    lcd.setCursor(0, 1);
119    lcd.print("Try Again");
120    printUID(mfrc522.uid.uidByte);
121    Serial.println(" - Invalid Card!");
122    delay(1500);
123    showWelcomeMessage();
124  }
125  mfrc522.PICC_HaltA();
126}
127
128// Helper functions
129int findUserIndex(byte *uid) {
130  for (int i = 0; i < NUM_USERS; i++) {
131    if (memcmp(uid, users[i].uid, 4) == 0) return i;
132  }
133  return -1;
134}
135
136void printUID(byte *uid) {
137  Serial.print("UID:");
138  for (byte i = 0; i < 4; i++) {
139    Serial.print(uid[i] < 0x10 ? " 0" : " ");
140    Serial.print(uid[i], HEX);
141  }
142}
143
144void showWelcomeMessage() {
145  lcd.clear();
146  lcd.print("Please Tap Your");
147  lcd.setCursor(0, 1);
148  lcd.print("Card/Keychain");
149}