RFID test (RFID-RC522)

https://mlwmlw.org/2015/07/%E6%B7%B1%E5%85%A5%E6%B7%BA%E5%87%BA-wifi-%E6%99%B6%E7%89%87-esp8266-with-arduino/


http://lets-make-games.blogspot.tw/2015/04/wifi-esp8266-wifi.html