Unit 28: Access given

 

 

 

Code for Sketch One: 

#include 
#include 

#define SS_PIN 10        // Pin for SDA
#define RST_PIN 9        // Pin for RST
#define LED_PIN 6        // Pin for LED or Buzzer

MFRC522 rfid(SS_PIN, RST_PIN); // Create MFRC522 instance

void setup() {
  Serial.begin(9600);          // Initialize serial communication
  SPI.begin();                 // Initialize SPI bus
  rfid.PCD_Init();             // Initialize the RFID reader
  pinMode(LED_PIN, OUTPUT);    // Set the LED or Buzzer pin as output
  Serial.println("Place your RFID tag near the reader.");
}

void loop() {
  // Look for new RFID cards
  if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()) {
    Serial.print("RFID tag UID: ");
    for (byte i = 0; i < rfid.uid.size; i++) {
      Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
      Serial.print(rfid.uid.uidByte[i], HEX);  // Print UID in hexadecimal format
    }
    Serial.println();

    // Turn on LED or Buzzer for one second
    digitalWrite(LED_PIN, HIGH); // Turn on the LED or Buzzer
    delay(1000);                 // Keep it on for 1 second
    digitalWrite(LED_PIN, LOW);  // Turn off the LED or Buzzer

    // Halt the PICC to prevent multiple readings of the same card
    rfid.PICC_HaltA();
    delay(1000);  // Add a delay to avoid multiple detections
  }
}


  

Code for Sketch Two (No serial output):

#include 
#include 

#define SS_PIN 10        // Pin for SDA
#define RST_PIN 9        // Pin for RST
#define LED_PIN 6        // Pin for LED or Buzzer

MFRC522 rfid(SS_PIN, RST_PIN); // Create MFRC522 instance

void setup() {
  SPI.begin();                 // Initialize SPI bus
  rfid.PCD_Init();             // Initialize the RFID reader
  pinMode(LED_PIN, OUTPUT);    // Set the LED or Buzzer pin as output
  digitalWrite(LED_PIN, HIGH); // Initially, turn the LED (or Buzzer) ON
}

void loop() {
  // Look for new RFID cards
  if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()) {
    
    // Turn off LED or Buzzer when the RFID tag is presented
    digitalWrite(LED_PIN, LOW);
    
    // Halt the PICC to prevent multiple readings of the same card
    rfid.PICC_HaltA();
    
    delay(1000);  // Add a delay to avoid multiple detections
  }
}

  

 

Notes: 

Use the following libraries by writing: #include <SPI.h> and #include <MFRC522.h> at the top of the sketch. This page treats it as instruction, so will not let us show it in the main code itself.