Crack Me If You Can

1// Created by Surya Skywalker. This code will be used in the locker. when
2  the correct card is swiped, light goes gren and door opens and when swiped a second
3  time, door closes and light goes
4// to blue. when wrong card is swiped, ligh
5  goes red and buzzer beeps. 
6
7#include <SPI.h>
8#include <MFRC522.h>
9#include
10  <Servo.h>
11
12#define SS_PIN 10
13#define RST_PIN 9
14#define Buzzer 8 // Pin
15  3 connected to + pin of the Buzzer
16
17Servo myservo;  // create servo object
18  to control a servo
19// twelve servo objects can be created on most boards
20MFRC522
21  mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
22
23int pos = 0;    //
24  variable to store the servo position
25int num = 0;
26int redPin = 2;
27int greenPin
28  = 4;
29int bluePin = 7;
30int counter = 0;
31const int buzzerPin = 8;
32
33void
34  setup() {
35  // put your setup code here, to run once:
36  Serial.begin(9600);
37   // Initiate a serial communication
38  SPI.begin();      // Initiate  SPI bus
39
40  mfrc522.PCD_Init();   // Initiate MFRC522
41  Serial.println("Approximate your
42  card to the reader...");
43  Serial.println();
44  myservo.attach(3);  // attaches
45  the servo on pin 9 to the servo object
46  myservo.write(0); //Set the servo at
47  position 0
48  pinMode(redPin, OUTPUT);
49  pinMode(greenPin, OUTPUT);
50  pinMode(bluePin,
51  OUTPUT);
52  setColor(0, 0, 225);  // blue
53  pinMode(Buzzer, OUTPUT); // Set
54  buzzer pin to an Output pin
55  digitalWrite(Buzzer, LOW); // Buzzer Off at startup
56
57}
58
59void
60  loop() {
61  // put your main code here, to run repeatedly:
62  // Look for new
63  cards
64  if ( ! mfrc522.PICC_IsNewCardPresent()) 
65  {
66    return;
67  }
68
69  // Select one of the cards
70  if ( ! mfrc522.PICC_ReadCardSerial()) 
71  {
72
73    return;
74  }
75  //Show UID on serial monitor
76  Serial.print("UID tag
77  :");
78  String content= "";
79  byte letter;
80  for (byte i = 0; i < mfrc522.uid.size;
81  i++) 
82  {
83     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
84
85     Serial.print(mfrc522.uid.uidByte[i], HEX);
86     content.concat(String(mfrc522.uid.uidByte[i]
87  < 0x10 ? " 0" : " "));
88     content.concat(String(mfrc522.uid.uidByte[i],
89  HEX));
90  }
91  Serial.println();
92  Serial.print("Message : ");
93  content.toUpperCase();
94
95  if (content.substring(1) == "4A 31 07 85") //change here the UID of the card/cards
96  that you want to give access
97  {
98    if (num % 2 == 0)
99    {
100      setColor(0,
101  225, 0); // Green
102      myservo.write(180);
103      Serial.println("Authorized
104  access");
105      Serial.println();
106    }
107    else  {
108      Serial.println("Locking...");
109
110      myservo.write(0);
111      delay(750);
112      Serial.println("Message :
113  Locked");
114      Serial.println();
115      setColor(0, 0, 225); // Blue
116
117    }
118    num = num + 1;
119    delay(3000);
120  }
121 
122  else   {
123    setColor(225,
124  0, 0); // Red
125    Serial.println("Access denied");
126    Serial.println();
127
128    beep(1000,10000);
129    setColor(0, 0, 225); // Blue
130  }
131}
132
133void
134  setColor(int red, int green, int blue)
135{
136  #ifdef COMMON_ANODE
137    red
138  = 255 - red;
139    green = 255 - green;
140    blue = 255 - blue;
141  #endif
142
143  analogWrite(redPin, red);
144  analogWrite(greenPin, green);
145  analogWrite(bluePin,
146  blue);  
147}
148
149void beep(int note, int duration)
150{
151  //Play tone on
152  buzzerPin
153  tone(buzzerPin, note);
154  delay(duration);
155  //Stop tone on
156  buzzerPin
157  noTone(buzzerPin);
158 
159  delay(50);
160 
161  //Increment counter
162
163  counter++;
164}
165