added arduino nfcReader files (#42)

Arduino/nfcReader/nfcReader.ino

@@ -0,0 +1,38 @@
+#include <Wire.h>
+#include <Adafruit_PN532.h>
+
+#define SDA_PIN 2
+#define SCL_PIN 1
+
+Adafruit_PN532 nfc(SDA_PIN, SCL_PIN);
+
+void setup(void) {
+  Serial.begin(115200);
+
+  nfc.begin();
+  uint32_t versiondata = nfc.getFirmwareVersion();
+  if (!versiondata) {
+    Serial.print("Didn't find PN53x board");
+    while (1);
+  }
+
+  nfc.SAMConfig();
+}
+
+void loop(void) {
+  uint8_t success;
+  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };
+  uint8_t uidLength;
+
+  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
+
+  if (success) {
+    for (uint8_t i = 0; i < uidLength; i++) {
+      String hexString = (uid[i] < 0x10 ? "0" : "") + String(uid[i], HEX);
+      hexString.toUpperCase();
+      Serial.print(hexString);
+    }
+    Serial.println("");
+    delay(1000);
+  }
+}