Hi,
I am trying to connect my Arduino Uno R4 Wifi to a RFID-RC522 reader. I have checked that my sketch is being uploaded correctly and that the wiring is secure.
Here is an image of my setup:
Here is my code:
#include <SPI.h>
#include <MFRC522.h>
// RC522 pins
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
void setup() {
Serial.begin(9600); // Start serial monitor
SPI.begin(); // Start SPI bus
mfrc522.PCD_Init(); // Initialize RC522
Serial.println("RFID Reader Ready. Scan a card...");
}
void loop() {
// Look for new cards
if (!mfrc522.PICC_IsNewCardPresent()) return;
if (!mfrc522.PICC_ReadCardSerial()) return;
// Print card UID
Serial.print("Card UID: ");
for (byte i = 0; i < mfrc522.uid.size; i++) {
Serial.print(mfrc522.uid.uidByte[i], HEX);
Serial.print(" ");
}
Serial.println();
// Halt PICC
mfrc522.PICC_HaltA();
}
When I run this, the RFID reader doesn't connect to the Arduino and can't read the card I have. I am very new to Arduino. Does anyone know what I am doing wrong or how to fix it? Thank you!
