RFID-RC522 Sensor

1#include <SPI.h>
2#include <MFRC522.h>
3 
4#define SS_PIN 10
5#define  RST_PIN 9
6#define RED 2
7#define Green 3
8MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
9 
10void setup() 
11{
12  Serial.begin(9600);   // Initiate a serial communication
13  SPI.begin();      // Initiate  SPI bus
14  mfrc522.PCD_Init();   // Initiate MFRC522
15  Serial.println("Approximate your  card to the reader...");
16  Serial.println();
17  pinMode(LED_BUILTIN, OUTPUT);
18   digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage  LOW
19   digitalWrite(Green, LOW);
20   digitalWrite(RED, LOW);
21
22}
23void  loop() 
24{
25  // Look for new cards
26  if ( ! mfrc522.PICC_IsNewCardPresent())  
27  {
28    return;
29  }
30  // Select one of the cards
31  if ( ! mfrc522.PICC_ReadCardSerial())  
32  {
33    return;
34  }
35  //Show UID on serial monitor
36  Serial.print("UID  tag :");
37  String content= "";
38  byte letter;
39  for (byte i = 0; i <  mfrc522.uid.size; i++) 
40  {
41     Serial.print(mfrc522.uid.uidByte[i] < 0x10  ? " 0" : " ");
42     Serial.print(mfrc522.uid.uidByte[i], HEX);
43     content.concat(String(mfrc522.uid.uidByte[i]  < 0x10 ? " 0" : " "));
44     content.concat(String(mfrc522.uid.uidByte[i],  HEX));
45  }
46  Serial.println();
47  Serial.print("Message : ");
48  content.toUpperCase();
49  if ((content.substring(1) == "1A 7C 78 30") || (content.substring(1) == "CC  CC A3 16") ) //change here the UID of the card/cards that you want to give access
50  {
51    Serial.println("Authorized access");
52    Serial.println();
53    digitalWrite(LED_BUILTIN,  HIGH);   // turn the LED on (HIGH is the voltage level)
54    digitalWrite(Green,  HIGH);
55    delay(10000);
56    digitalWrite(Green, LOW);
57  }
58 
59 else   {
60  
61    Serial.println(" Access denied");
62     digitalWrite(LED_BUILTIN,  LOW);    // turn the LED off by making the voltage LOW
63    digitalWrite(RED,  HIGH);
64    delay(10000);
65    digitalWrite(RED, LOW);
66  
67  }
68} 

1#include <SPI.h>
2#include <MFRC522.h>
3 
4#define SS_PIN 10
5#define
6  RST_PIN 9
7#define RED 2
8#define Green 3
9MFRC522 mfrc522(SS_PIN, RST_PIN);
10   // Create MFRC522 instance.
11 
12void setup() 
13{
14  Serial.begin(9600);
15   // Initiate a serial communication
16  SPI.begin();      // Initiate  SPI bus
17
18  mfrc522.PCD_Init();   // Initiate MFRC522
19  Serial.println("Approximate your
20  card to the reader...");
21  Serial.println();
22  pinMode(LED_BUILTIN, OUTPUT);
23
24   digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage
25  LOW
26   digitalWrite(Green, LOW);
27   digitalWrite(RED, LOW);
28
29}
30void
31  loop() 
32{
33  // Look for new cards
34  if ( ! mfrc522.PICC_IsNewCardPresent())
35  
36  {
37    return;
38  }
39  // Select one of the cards
40  if ( ! mfrc522.PICC_ReadCardSerial())
41  
42  {
43    return;
44  }
45  //Show UID on serial monitor
46  Serial.print("UID
47  tag :");
48  String content= "";
49  byte letter;
50  for (byte i = 0; i <
51  mfrc522.uid.size; i++) 
52  {
53     Serial.print(mfrc522.uid.uidByte[i] < 0x10
54  ? " 0" : " ");
55     Serial.print(mfrc522.uid.uidByte[i], HEX);
56     content.concat(String(mfrc522.uid.uidByte[i]
57  < 0x10 ? " 0" : " "));
58     content.concat(String(mfrc522.uid.uidByte[i],
59  HEX));
60  }
61  Serial.println();
62  Serial.print("Message : ");
63  content.toUpperCase();
64
65  if ((content.substring(1) == "1A 7C 78 30") || (content.substring(1) == "CC
66  CC A3 16") ) //change here the UID of the card/cards that you want to give access
67
68  {
69    Serial.println("Authorized access");
70    Serial.println();
71    digitalWrite(LED_BUILTIN,
72  HIGH);   // turn the LED on (HIGH is the voltage level)
73    digitalWrite(Green,
74  HIGH);
75    delay(10000);
76    digitalWrite(Green, LOW);
77  }
78 
79 else
80   {
81  
82    Serial.println(" Access denied");
83     digitalWrite(LED_BUILTIN,
84  LOW);    // turn the LED off by making the voltage LOW
85    digitalWrite(RED,
86  HIGH);
87    delay(10000);
88    digitalWrite(RED, LOW);
89  
90  }
91}