使用arduino创建找到的Mifare标记列表？

我正在与Arduino Uno和adaFruit PN532董事会合作。目标是能够创建一个目前在NFC盾牌范围内的MiFare卡列表

我很难找到写这个逻辑的最佳方法，因为电路板似乎只检测到每个循环一张卡

我可以在棋盘上放置两张牌，它可以看到两张牌，但每个循环只能看到一张。那么，我如何创建当前范围内的内容的当前列表呢

我的循环：

 void loop()
{

  Serial.println("--------------------Loop begin-------------------");
  uint8_t success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
  uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)

  uint8_t index =0;  
  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);

   if (success) {

    // Display some basic information about the card
    Serial.println("Found an ISO14443A card");
    Serial.print("  UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
    Serial.print("  UID Value: ");
    nfc.PrintHex(uid, uidLength);
    Serial.println("");

  }

   Serial.println("************************Loop END*********************");
}

当两个卡都在范围内时，这是串行监视器输出：

 void loop()
{

  Serial.println("--------------------Loop begin-------------------");
  uint8_t success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
  uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)

  uint8_t index =0;  
  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);

   if (success) {

    // Display some basic information about the card
    Serial.println("Found an ISO14443A card");
    Serial.print("  UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
    Serial.print("  UID Value: ");
    nfc.PrintHex(uid, uidLength);
    Serial.println("");

  }

   Serial.println("************************Loop END*********************");
}

--------------------循环开始-----------------

找到ISO14443A卡
UID长度：4字节
UID值：0x13 0x99 0x1C 0xD4

****************************循环结束*****************************

--------------------循环开始-----------------
找到ISO14443A卡
UID长度：4字节
UID值：0x13 0x34 0x27 0xD4

****************************循环结束*****************************

您需要一些状态（类似于带有ID和长度字段的结构数组）位于循环的外部来存储（可能有多个）UID。如果有多张卡的话，我认为返回哪个卡的ID可能有点随机

我想您需要继续读取ID，检查数组以查看是否以前见过它，如果没有，则存储它。然后经过一段时间（或数组溢出，或其他一些触发器），您可以打印出“最近”看到的ID，并将数组重置为空（例如，通过清除长度字段）