pretty new to programming in general. i having trouble getting this to actually output the RFID tags UID to the serial monitor. I need to know it in order to name the .wav files the same thing. in the serial monitor it just says " Card UID: " with on uid after. why would this be?
#include <SD.h>
#include <MFRC522.h>
// Set up the RFID reader
const byte RST_PIN = 9; // Reset pin for the RFID reader
const byte RFID_SS_PIN = 10; // SS (slave select) pin for the RFID reader
MFRC522 mfrc522(RFID_SS_PIN, RST_PIN); // Create an instance of the RFID reader
// Set up the micro SD card
const int chipSelect = 4; // Chip select pin for the SD card module
void setup() {
Serial.begin(9600); // Initialize serial communication
SPI.begin(); // Initialize the SPI bus
mfrc522.PCD_Init(); // Initialize the RFID reader
// Initialize the SD card
Serial.println("Initializing SD card...");
if (!SD.begin(chipSelect)) {
Serial.println("Error initializing SD card");
return;
}
Serial.println("SD card initialized");
}
void loop() {
// Look for an RFID tag
if (mfrc522.PICC_IsNewCardPresent()) {
// Select the RFID tag
MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
// Read the UID (unique identifier) of the RFID tag
String uid = "";
for (byte i = 0; i < mfrc522.uid.size; i++) {
uid += String(mfrc522.uid.uidByte[i], HEX);
}
Serial.println("Card UID: " + uid);
// Open the corresponding file on the SD card based on the UID of the RFID tag
String fileName = uid + ".wav"; // Assume the file is a WAV
File songFile = SD.open(fileName);
if (!songFile) {
Serial.println("Error opening file");
return;
}
// Play the song
// (You'll need to use a music player library or something similar to actually play the song)
}
}