RFID-Based FASTag Toll Gate Simulator using Arduino Uno

1pip install pyserial

1#include <Wire.h>
2#include <Servo.h>
3#include <SPI.h>
4#include <MFRC522.h>
5#include <LiquidCrystal_I2C.h>
6
7#define SS_PIN 10
8#define RST_PIN 9
9#define SERVO_PIN 3
10#define TRIG_PIN 6
11#define ECHO_PIN 7
12#define BUZZER_PIN 5
13
14MFRC522 rfid(SS_PIN, RST_PIN);
15LiquidCrystal_I2C lcd(0x27, 16, 2);
16Servo gate;
17
18bool gateOpen = false;
19
20void setup() {
21  Serial.begin(9600);
22  SPI.begin();
23  rfid.PCD_Init();
24  lcd.init();
25  lcd.backlight();
26  pinMode(TRIG_PIN, OUTPUT);
27  pinMode(ECHO_PIN, INPUT);
28  pinMode(BUZZER_PIN, OUTPUT);
29  digitalWrite(BUZZER_PIN, HIGH); // Buzzer OFF (active-low)
30  gate.attach(SERVO_PIN);
31  closeGate();
32
33  lcd.setCursor(0, 0);
34  lcd.print("Scan your card");
35}
36
37void loop() {
38  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;
39
40  String uid = "";
41  for (byte i = 0; i < rfid.uid.size; i++) {
42    uid += String(rfid.uid.uidByte[i], HEX);
43  }
44  uid.toUpperCase();
45
46  lcd.clear();
47  lcd.setCursor(0, 0);
48  lcd.print("UID: " + uid);
49  Serial.println(uid);
50
51  waitForResponse(uid);
52
53  rfid.PICC_HaltA();
54}
55
56void waitForResponse(String uid) {
57  unsigned long startTime = millis();
58  while (millis() - startTime < 3000) {
59    if (Serial.available()) {
60      String command = Serial.readStringUntil('\n');
61      command.trim();
62      if (command == "ALLOW") {
63        lcd.setCursor(0, 1);
64        lcd.print("Access Granted");
65        soundBuzzer(1);
66        openGate();
67        waitForCarToPass();
68        closeGate();
69      } else if (command == "DENY") {
70        lcd.setCursor(0, 1);
71        lcd.print("Access Denied");
72        soundBuzzer(3);
73      }
74      return;
75    }
76  }
77  lcd.setCursor(0, 1);
78  lcd.print("No response");
79}
80
81void waitForCarToPass() {
82  while (true) {
83    long duration, distance;
84    digitalWrite(TRIG_PIN, LOW);
85    delayMicroseconds(2);
86    digitalWrite(TRIG_PIN, HIGH);
87    delayMicroseconds(10);
88    digitalWrite(TRIG_PIN, LOW);
89    duration = pulseIn(ECHO_PIN, HIGH);
90    distance = duration * 0.034 / 2;
91
92    if (distance > 20) break;
93    delay(200);
94  }
95  delay(3000);
96}
97
98void openGate() {
99  for (int pos = 90; pos >= 0; pos--) {
100    gate.write(pos);
101    delay(10);
102  }
103  gateOpen = true;
104}
105
106void closeGate() {
107  for (int pos = 0; pos <= 90; pos++) {
108    gate.write(pos);
109    delay(10);
110  }
111  gateOpen = false;
112}
113
114void soundBuzzer(int times) {
115  for (int i = 0; i < times; i++) {
116    tone(BUZZER_PIN,1000);
117    delay(200);
118    noTone(BUZZER_PIN);
119    delay(200);
120  }
121}

1import serial
2import time
3
4PORT = "COM3"  # Change if needed
5BALANCE_FILE = "balances.txt"
6FARE = 20
7
8def load_balances():
9    balances = {}
10    try:
11        with open(BALANCE_FILE, "r") as f:
12            for line in f:
13                uid, amount = line.strip().split(":")
14                balances[uid] = int(amount)
15    except FileNotFoundError:
16        pass
17    return balances
18
19def save_balances(balances):
20    with open(BALANCE_FILE, "w") as f:
21        for uid, amount in balances.items():
22            f.write(f"{uid}:{amount}\n")
23
24def recharge(balances):
25    uid = input("Enter UID to recharge: ").strip().upper()
26    amt = int(input("Enter amount: ₹"))
27    balances[uid] = balances.get(uid, 0) + amt
28    save_balances(balances)
29    print(f"UID {uid} recharged. New balance: ₹{balances[uid]}")
30
31def main():
32    balances = load_balances()
33
34    try:
35        ser = serial.Serial(PORT, 9600, timeout=3)
36        time.sleep(2)
37        print("Connected to Arduino.")
38
39        while True:
40            print("\nPress [Enter] to run, [r] to recharge, [q] to quit.")
41            opt = input(">>> ").strip().lower()
42
43            if opt == "q":
44                break
45            elif opt == "r":
46                recharge(balances)
47                continue
48
49            print("Waiting for card...")
50            uid = ser.readline().decode().strip().upper()
51
52            if uid == "":
53                print("No UID received.")
54                continue
55
56            print(f"Card scanned: {uid}")
57
58            if uid not in balances:
59                print("New card detected.")
60                balances[uid] = 0
61                save_balances(balances)
62
63            if balances[uid] >= FARE:
64                balances[uid] -= FARE
65                save_balances(balances)
66                print(f"Access granted. ₹{FARE} deducted. Balance: ₹{balances[uid]}")
67                ser.write(b"ALLOW\n")
68            else:
69                print(f"Access denied. Balance: ₹{balances[uid]}")
70                ser.write(b"DENY\n")
71
72    except serial.SerialException:
73        print("Serial connection failed. Check COM port.")
74    finally:
75        if 'ser' in locals() and ser.is_open:
76            ser.close()
77
78if __name__ == "__main__":
79    main()