diff --git a/RFID-Transponder-Code/RFID-Transponder-Source.ino b/RFID-Transponder-Code/RFID-Transponder-Source.ino
new file mode 100644
index 0000000..290e4de
--- /dev/null
+++ b/RFID-Transponder-Code/RFID-Transponder-Source.ino
@@ -0,0 +1,234 @@
+#include "ST25DVSensor.h"
+#include <SPI.h>
+#include <SD.h>
+
+#if defined(ARDUINO_B_L4S5I_IOT01A)
+  #define GPO_PIN PE4
+  #define LPD_PIN PE2
+  #define SDA_PIN PB11
+  #define SCL_PIN PB10
+  #define WireNFC MyWire
+  TwoWire MyWire(SDA_PIN, SCL_PIN);
+  ST25DV st25dv(12, -1, &MyWire);
+#else
+  #define DEV_I2C         Wire
+  ST25DV st25dv(12, -1, &DEV_I2C);
+#endif
+String last_read;
+bool cleared = false;
+const int chipSelect = 7;
+
+void beep(int pitch, int duration, int loudness){
+  tone(24, pitch, loudness);
+  delay(duration);
+  noTone(24);
+  delay(10);
+}
+
+void clearFile(const char* filename) {
+  if (SD.begin(chipSelect)) {
+    // Open the file in write mode without appending
+    File myFile = SD.open(filename, FILE_WRITE | O_TRUNC);
+    
+    if (myFile) {
+      myFile.close();
+      Serial.println("File cleared!");
+    }
+  }
+}
+
+void printLine(){
+  for(int i = 0; i < 50; i++){
+    Serial.print('-');
+  }
+  Serial.println();
+}
+
+void printStart(){
+  Serial.println(F("         ╔═══╦═══╦══╦═══╗"));
+  Serial.println(F("         ║╔═╗║╔══╩╣╠╩╗╔╗║"));
+  Serial.println(F("         ║╚═╝║╚══╗║║─║║║║"));
+  Serial.println(F("         ║╔╗╔╣╔══╝║║─║║║║"));
+  Serial.println(F("         ║║║╚╣║──╔╣╠╦╝╚╝║"));
+  Serial.println(F("         ╚╝╚═╩╝──╚══╩═══╝"));  
+  printLine();
+  Serial.println(F("By Ruben Schoonbaert"));
+  Serial.println(F("Written 29/12/2023"));
+  printLine();
+  delay(1000);
+  Serial.println(F("COMMANDS:"));
+  Serial.println(F("$printFile -> prints all records on the SD card"));
+  Serial.println(F("$clearFile -> clears all records on the SD card"));
+  Serial.println(F("$clearRFID -> removes last entry from RFID tag"));
+  Serial.println(F("$addRecord <record> -> Adds new record to SD & RFID Tag"));
+  Serial.println(F("$testBuzzer -> Tests integrated piezo buzzer"));
+  Serial.println(F("$testLED -> Tests integrated LED"));
+  printLine();
+}
+
+void printFile(const char* filename) {
+  if (SD.begin(chipSelect)) {
+    // Open the file in read mode
+    File myFile = SD.open(filename, FILE_READ);
+    printLine();
+    Serial.println(F("    Printing SD-Card content    "));
+    printLine();
+    if (myFile) {
+      while (myFile.available()) {
+        Serial.write(myFile.read());
+      }
+      
+      myFile.close();
+      printLine();
+    } else {
+      Serial.println(F("Error opening file for reading."));
+      digitalWrite(25, HIGH);
+    }
+  }
+}
+
+bool isDuplicate(const char* filename, const String& newString) {
+  File file = SD.open(filename);
+  if (file) {
+    while (file.available()) {
+      String line = file.readStringUntil('\n');
+      line.trim();
+      if (line.equals(newString)) {
+        file.close();
+        return true; // Duplicate found
+      }
+    }
+    file.close();
+  }
+  return false; // No duplicate found
+}
+
+void addRecord(String record){
+  const char uri_write_protocol[] = URI_ID_0x01_STRING;
+  if(st25dv.writeURI(uri_write_protocol, record, "")) {
+    Serial.println(F("Write to RFID Tag failed!"));
+    digitalWrite(25, HIGH);
+    while(1);
+  } else {
+    if(record != "!ignore"){
+    Serial.print(F("Written : \""));
+    Serial.print(record);
+    Serial.print(F("\" to RFID tag succesfully"));
+    Serial.println();
+    }
+  }
+}
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(24, OUTPUT);
+  pinMode(25, OUTPUT);
+  digitalWrite(25, HIGH);
+  printStart();
+  // The wire instance used can be omitted in case you use default Wire instance
+  if(st25dv.begin() == 0) {
+    Serial.println(F("System Init done!"));
+    beep(2000, 100, 50);
+  } else {
+    Serial.println("System Init failed!");
+    digitalWrite(25, HIGH);
+    while(1);
+  }
+  delay(500);
+  digitalWrite(25, LOW);
+}
+
+void loop() {  
+  String uri_read;
+   if (Serial.available() > 0) {
+    String command = Serial.readStringUntil('\n');
+    command.trim();
+    
+    if (command.equals("$clearFile")) {
+      clearFile("records.txt");
+      cleared = true;
+      beep(2000, 100, 50);
+      return;
+    } else if (command.equals("$printFile")){
+       beep(2000, 100, 50);
+      printFile("records.txt");
+    } else if (command.startsWith("$addRecord ")) {
+      // Extract the record from the command
+      String recordToAdd = command.substring(11); 
+      // Add the record to the file
+      addRecord(recordToAdd);
+    } else if (command.equals("$clearRFID")){
+       addRecord("!ignore");
+       Serial.println(F("Cleared RFID"));
+         beep(2000, 100, 50);
+    } else if (command.equals("$testLED")){
+      bool state = false;
+      for(int i = 0; i<10; i++){
+        digitalWrite(25, state);
+        state = !state;
+        delay(100);
+      }
+    }
+     else if (command.equals("$testBuzzer")){
+     int melody[] = {262, 330, 392, 523, 392, 330, 262, 196, 262};
+     for (int i = 0; i < sizeof(melody) / sizeof(melody[0]); i++) {
+      delay(10);
+      beep(melody[i], 200, 100);
+     }
+
+    } else {
+      Serial.println("unrecognised command!");
+      beep(500, 500, 500);
+    }
+  }
+  
+  if(st25dv.readURI(&uri_read)) {
+    Serial.println("Read failed!");
+    digitalWrite(25, HIGH);
+    while(1);
+  } 
+  if(uri_read != last_read){
+     if (SD.begin(chipSelect)) {
+      if(uri_read.startsWith("www.")){
+        uri_read = uri_read.substring(4);
+      }
+      else if(uri_read.startsWith("http://www.")){
+        uri_read = uri_read.substring(11);
+      }
+      else if(uri_read.startsWith("http://")){
+        uri_read = uri_read.substring(7);
+      }
+      else if(uri_read.startsWith("https://")){
+        uri_read = uri_read.substring(8);
+      }
+      if(uri_read != "!ignore"){
+        // Check if the last line of the file is the same as the string
+        if (!isDuplicate("records.txt", uri_read)) {
+          if(!cleared){
+            Serial.print(F("New record detected = "));
+          } else {
+            Serial.print(F("current RFID record = "));
+          }
+          cleared = false;
+          Serial.print(uri_read);
+          Serial.println();
+          
+          File myFile = SD.open("records.txt", FILE_WRITE);
+          if (myFile) {
+            // Write to the file
+            myFile.println(uri_read);
+            // Close the file
+            myFile.close();
+            delay(100);
+            beep(800, 100, 50);
+            delay(10);
+            beep(1000, 100, 50);
+           }
+          }
+        }
+       last_read = uri_read;
+     }
+  }
+  delay(500);
+  digitalWrite(25, LOW);
+}