Exoeriment 9 (EM 18 Reader Module)

 //#include <SPI.h>

//#include <MFRC522.h>

#define RST_PIN 9

#define SS_PIN 10

//MFRC522 rfid(SS_PIN, RST_PIN);

// Map each card UID to a name and add more cards as needed

String cardUIDs[] = { "1D000552D19B", "1D000858E7AA", "1D0006B8BD1E"}; // Replace with actual UIDs from EM-18

String cardNames[] = { "mahesh", "Charan","manikanta"};   // Replace with actual names

// Function to get the name associated with the UID

String getCardName(String uid) {

  for (int i = 0; i < sizeof(cardUIDs) / sizeof(cardUIDs[0]); i++) {

    if (uid == cardUIDs[i]) {

      return cardNames[i];

    }

  }

  return "Unknown";

}

void setup () {

  Serial.begin(9600); // Initialize serial communication with EM-18 (default 9600 baud)

  Serial.println("Scan your RFID card...");

}

void loop () {

  // Check if EM-18 sent data

  if (Serial.available() > 0) {

    String uid = Serial.readStringUntil('\n'); // Read UID until newline (EM-18 sends 12 chars + CR/LF)

    uid.trim();  // Remove spaces/newline characters

    String name = getCardName(uid);

    if (name != "Unknown") {

      Serial.print("Attendance Marked for: ");

      Serial.println(name);

    } else {

      Serial.print("Card not recognized: ");

      Serial.println(uid);

    }

  }

}