Two_RFID_Interface_Ambulance_System_Sunil_Singh_Negi

 #include <SPI.h>

#include <MFRC522.h>

// Define pins for RFID readers

#define RST_PIN_1 9

#define SDA_PIN_1 10

#define RST_PIN_2 7

#define SDA_PIN_2 8

// Define LED pins

#define LED_1_PIN 5  // LED for RFID reader 1

#define LED_2_PIN 6  // LED for RFID reader 2

MFRC522 rfid1(SDA_PIN_1, RST_PIN_1); // RFID reader 1

MFRC522 rfid2(SDA_PIN_2, RST_PIN_2); // RFID reader 2

void setup() {

  Serial.begin(9600);

  

  SPI.begin(); // Initialize SPI bus

  

  // Initialize RFID readers

  rfid1.PCD_Init();

  rfid2.PCD_Init();

  

  // Initialize LEDs as outputs

  pinMode(LED_1_PIN, OUTPUT);

  pinMode(LED_2_PIN, OUTPUT);

  

  // Turn off LEDs initially

  digitalWrite(LED_1_PIN, LOW);

  digitalWrite(LED_2_PIN, LOW);

  

  Serial.println("Place card/tag near one of the readers...");

}

void loop() {

  // Check RFID Reader 1

  if (rfid1.PICC_IsNewCardPresent() && rfid1.PICC_ReadCardSerial()) {

    Serial.print("Reader 1 detected card ID: ");

    printCardID(rfid1);

    rfid1.PICC_HaltA(); // Halt reader 1

    

    // Blink LED for RFID reader 1

    blinkLED(LED_1_PIN);

  }

  

  // Check RFID Reader 2

  if (rfid2.PICC_IsNewCardPresent() && rfid2.PICC_ReadCardSerial()) {

    Serial.print("Reader 2 detected card ID: ");

    printCardID(rfid2);

    rfid2.PICC_HaltA(); // Halt reader 2

    

    // Blink LED for RFID reader 2

    blinkLED(LED_2_PIN);

  }

}

// Function to print the RFID card ID

void printCardID(MFRC522& reader) {

  for (byte i = 0; i < reader.uid.size; i++) {

    Serial.print(reader.uid.uidByte[i], HEX);

  }

  Serial.println();

}

// Function to blink the LED

void blinkLED(int ledPin) {

  digitalWrite(ledPin, HIGH); // Turn on the LED

  delay(500);                // Keep it on for 500 ms

  digitalWrite(ledPin, LOW); // Turn off the LED

}