//https://fr.38-3d.co.uk/blogs/blog-38-3d-3/comment-utiliser-le-lecteur-rfid-nfc-pn532-avec-arduino

#include <Wire.h>
#include <Adafruit_PN532.h>

#define SDA_PIN 21
#define SCL_PIN 22

Adafruit_PN532 nfc(SDA_PIN, SCL_PIN);

void setup() {
  Serial.begin(115200);
  Serial.println("PN532 RFID/NFC Reader Test");

  nfc.begin();

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (!versiondata) {
    Serial.println("Didn't find PN532 module. Check connections.");
    while (1);
  }

  Serial.println("Found PN532 module.");
  nfc.SAMConfig(); // Configure the module in normal mode
  Serial.println("Waiting for an NFC card...");
}

void loop() {
  uint8_t success;
  uint8_t uid[] = { 0 }; // Buffer to store UID
  uint8_t uidLength;     // Length of the UID

  // Check if an NFC card is present
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);

  if (success) {
    Serial.println("Found an NFC card!");
    Serial.print("UID Length: ");
    Serial.print(uidLength, DEC);
    Serial.println(" bytes");
    Serial.print("UID Value: ");
    for (uint8_t i = 0; i < uidLength; i++) {
      Serial.print(" 0x");
      Serial.print(uid[i], HEX);
    }
    Serial.println("");
    delay(1000); // Wait 1 second
  }
}