Module 07 // Security SPI

RFID Keycard Asset Validation System

Interceptors scanning MIFARE classic security tags using high-frequency Serial Peripheral Interfacing (SPI) channels.

📋 MFRC522 Bus Routing Mapping

MFRC522 Pin	Vector	Target Uno Pin
SDA (SS)	====>	Digital Pin 10
SCK	====>	Digital Pin 13
MISO	<====	Digital Pin 12
MOSI	====>	Digital Pin 11

💻 Decryption Validation Firmware

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

#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(9600);
  SPI.begin();
  mfrc522.PCD_Init();
}

void loop() {
  if ( ! mfrc522.PICC_IsNewCardPresent()) return;
  if ( ! mfrc522.PICC_ReadCardSerial()) return;
  
  String tagID = "";
  for (byte i = 0; i < mfrc522.uid.size; i++) {
     tagID.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
     tagID.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  tagID.toUpperCase();
  Serial.print("Scanned HEX String Matrix:"); Serial.println(tagID);
  mfrc522.PICC_HaltA();
}