โมดูล RFID NFC RC-522 13.56MHz SPI SNP-00133

1#include <SPI.h>
2#include <MFRC522.h>
3
4#define SS_PIN 10
5#define RST_PIN 9
6MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance.
7
8void setup() {
9  Serial.begin(9600);   // Initialize serial communications with the PC
10  SPI.begin();          // Init SPI bus
11  mfrc522.PCD_Init();   // Init MFRC522 card
12  
13  Serial.println("Place your card near the reader...");
14}
15
16void loop() {
17  // Look for new cards
18  if ( ! mfrc522.PICC_IsNewCardPresent()) {
19    return;
20  }
21
22  // Select one of the cards
23  if ( ! mfrc522.PICC_ReadCardSerial()) {
24    return;
25  }
26
27  // Show UID on serial monitor
28  Serial.print("UID tag: ");
29  String content = "";
30  for (byte i = 0; i < mfrc522.uid.size; i++) {
31    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
32    Serial.print(mfrc522.uid.uidByte[i], HEX);
33    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
34    content.concat(String(mfrc522.uid.uidByte[i], HEX));
35  }
36  Serial.println();
37  delay(1000);  // Wait 1 second before reading again
38}
39

1#include <SPI.h>
2#include <MFRC522.h>
3
4#define SS_PIN 10
5#define RST_PIN 9
6MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance.
7
8void setup() {
9  Serial.begin(9600);   // Initialize serial communications with the PC
10  SPI.begin();          // Init SPI bus
11  mfrc522.PCD_Init();   // Init MFRC522 card
12  pinMode(LED_BUILTIN, OUTPUT);  // Set the LED_BUILTIN pin as an output
13  
14  Serial.println("Place your card near the reader...");
15}
16
17void loop() {
18  // Look for new cards
19  if ( ! mfrc522.PICC_IsNewCardPresent()) {
20    return;
21  }
22
23  // Select one of the cards
24  if ( ! mfrc522.PICC_ReadCardSerial()) {
25    return;
26  }
27
28  // Show UID on serial monitor
29  Serial.print("UID tag: ");
30  String content = "";
31  for (byte i = 0; i < mfrc522.uid.size; i++) {
32    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
33    Serial.print(mfrc522.uid.uidByte[i], HEX);
34    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
35    content.concat(String(mfrc522.uid.uidByte[i], HEX));
36  }
37  Serial.println();
38
39  // Check if the scanned card's UID matches the allowed card
40  if (content.equalsIgnoreCase(" B3 2E FE 28")) {
41    Serial.println("Authorized access! LED on.");
42    digitalWrite(LED_BUILTIN, HIGH);  // Turn on the LED
43  } else {
44    Serial.println("Access denied! LED off.");
45    digitalWrite(LED_BUILTIN, LOW);  // Turn off the LED
46  }
47
48  delay(1000);  // Wait 1 second before reading again
49}
50