How to find your UID

H UID θα σας χρειαστεί για να να μπορεί το Rfid να αναγνωρίζει την κάρτα

Υλικά

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

void setup() {
    Serial.begin(9600); // Initialize serial communications with the PC
    SPI.begin();            // Init SPI bus
    mfrc522.PCD_Init(); // Init MFRC522 card
    Serial.println("Scan PICC to see UID and type...");
}

void loop() {
    // Look for new cards
    if ( ! mfrc522.PICC_IsNewCardPresent()) {
        return;
    }

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial()) {
        return;
    }

    // Dump debug info about the card. PICC_HaltA() is automatically called.
    mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
}

RFID με Relay

H UID θα το τοποθετήετε μέσα στον κώδικα εκεί που λέει

String ok_rfid_1="e199312d";

Επίσης πρέπει να τοποθετήσουμε το UID με μικρά γράμματα και χωρίς space.

Υλικά

#include <SPI.h>
#include <MFRC522.h>

#define RST_PIN         9           // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

String read_rfid;                   // Add how many you need and don't forget to include the UID.
String ok_rfid_1="e199312d";        // This is for my main RFID Card. aka. The one I will be using to turn on my PC. Can also be used to shut it down if you want to.
String ok_rfid_2="fbecb673";        // This is for the RFID Keyfob. aka. Shutdown Keyfob. Not advisable tho. Just shutdown your PC normally.
int lock = 7;                       // For the Card.
int lock2 = 7;                      // For the Keyfob.
/*
 * Initialize.
 */
void setup() {
    Serial.begin(9600);         // Initialize serial communications with the PC
    while (!Serial);            // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();                // Init SPI bus
    mfrc522.PCD_Init();         // Init MFRC522 card

    //Choose which lock below:
    pinMode(lock, OUTPUT);
    pinMode(lock2, OUTPUT);
}
/*
 * Helper routine to dump a byte array as hex values to Serial.
 */
void dump_byte_array(byte *buffer, byte bufferSize) {
    read_rfid="";
    for (byte i = 0; i < bufferSize; i++) {
        read_rfid=read_rfid + String(buffer[i], HEX);
    }
}

void open_lock() {
  //Use this routine when working with Relays and Solenoids etc.
  digitalWrite(lock,HIGH);
  delay(500);
  digitalWrite(lock,LOW);
}


void close_lock2() {          // You can also just use the card to shutdown your PC. This is just for those moments that you really need to shut it down quickly. 
  //Use this routine when working with Relays and Solenoids etc.
  digitalWrite(lock2, HIGH);
  delay(5000);                
  digitalWrite(lock2,LOW);
}


void loop() {

      // Look for new cards
    if ( ! mfrc522.PICC_IsNewCardPresent())
        return;

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial())
        return;

    dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
    Serial.println(read_rfid);
    if (read_rfid==ok_rfid_1) {
      //ok, open the door.
      open_lock();
    }

    Serial.println(read_rfid);
    if (read_rfid==ok_rfid_2) {
      //ok, open the door.
      close_lock2();
    }
    //Add below as many "keys" as you want
    //if (read_rfid==ok_rfid_2) {
      //also ok, open the door
    //  open_lock();
    //}
    // else not needed. Anything else is not ok, and will not open the door...
}