SPE Safe

1#include <SPI.h>
2#include <MFRC522.h>
3#include <Wire.h>
4#include <LiquidCrystal_I2C.h>
5#include <Keypad.h>
6#include <Servo.h>
7
8#define RST_PIN         5
9#define SS_PIN          53
10#define BUZZER_PIN      8
11#define SERVO_CARD_PIN  6
12#define SERVO_PIN_PIN   7
13
14MFRC522 mfrc522(SS_PIN, RST_PIN);
15LiquidCrystal_I2C lcd(0x27, 16, 2);
16Servo servoCard;
17Servo servoPIN;
18
19const String correctUID = "00:00:00:00";
20const String correctPIN = "4567";
21String enteredPIN = "";
22
23bool cardUnlocked = false;
24bool pinUnlocked = false;
25
26const byte ROWS = 4;
27const byte COLS = 3;
28char keys[ROWS][COLS] = {
29  {'1','2','3'},
30  {'4','5','6'},
31  {'7','8','9'},
32  {'*','0','#'}
33};
34byte rowPins[ROWS] = {A0, A1, A2, A3};
35byte colPins[COLS] = {A4, A5, A6};
36
37Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
38
39void beep() {
40  digitalWrite(BUZZER_PIN, HIGH);
41  delay(100);
42  digitalWrite(BUZZER_PIN, LOW);
43}
44
45void setup() {
46  Serial.begin(9600);
47  SPI.begin();
48  mfrc522.PCD_Init();
49  lcd.init();
50  lcd.backlight();
51
52  pinMode(BUZZER_PIN, OUTPUT);
53
54  servoCard.attach(SERVO_CARD_PIN);
55  servoPIN.attach(SERVO_PIN_PIN);
56
57  servoCard.write(0);
58  servoPIN.write(0);
59
60  lcd.setCursor(0, 0);
61  lcd.print("Scan your card");
62}
63
64void loop() {
65  if (!cardUnlocked) {
66    if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
67      beep();
68
69      String readUID = "";
70      for (byte i = 0; i < mfrc522.uid.size; i++) {
71        readUID += String(mfrc522.uid.uidByte[i], HEX);
72        if (i < mfrc522.uid.size - 1) readUID += ":";
73      }
74      readUID.toUpperCase();
75      Serial.println("UID: " + readUID);
76
77      lcd.clear();
78      if (readUID == correctUID) {
79        lcd.print("Card OK");
80        servoCard.write(90);
81        cardUnlocked = true;
82        delay(1000);
83        lcd.clear();
84        lcd.print("Enter PIN:");
85        lcd.setCursor(0, 1);
86      } else {
87        lcd.print("Wrong card");
88        delay(1000);
89        lcd.clear();
90        lcd.print("Scan your card");
91      }
92
93      mfrc522.PICC_HaltA();
94      mfrc522.PCD_StopCrypto1();
95    }
96  } else if (!pinUnlocked) {
97    char key = keypad.getKey();
98    if (key) {
99      beep();
100      if (key == '*') {
101        enteredPIN = "";
102        lcd.setCursor(0, 1);
103        lcd.print("                ");
104        lcd.setCursor(0, 1);
105      } else if (key == '#') {
106        if (enteredPIN == correctPIN) {
107          lcd.clear();
108          lcd.print("PIN Correct");
109          servoPIN.write(90);
110          pinUnlocked = true;
111          delay(2000);
112          lcd.clear();
113          lcd.print("Safe Opened");
114        } else {
115          lcd.clear();
116          lcd.print("Wrong PIN");
117          servoCard.write(0); // relock
118          enteredPIN = "";
119          cardUnlocked = false;
120          delay(2000);
121          lcd.clear();
122          lcd.print("Scan your card");
123        }
124      } else if (enteredPIN.length() < 4 && isDigit(key)) {
125        enteredPIN += key;
126        lcd.print("*");
127      }
128    }
129  } else {
130    // Once open, rescan card to lock again
131    if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
132      beep();
133      lcd.clear();
134      lcd.print("Safe Locked");
135      servoCard.write(0);
136      servoPIN.write(0);
137      enteredPIN = "";
138      cardUnlocked = false;
139      pinUnlocked = false;
140      delay(2000);
141      lcd.clear();
142      lcd.print("Scan your card");
143    }
144  }
145}