An automatic toll gate system using Arduino revolutionises traditional toll collection by eliminating manual intervention.
So you want to control some mains electrical (or lower voltage) item using your phone, perhaps? This single ESP8266 plug-in controls a relay that is built in to the module. An Android app (.apk) ...
Access Control system using a cheap MFRC522, PN532 RFID, RDM6300 readers or Wiegand RFID readers and Espressif's ESP8266 Microcontroller. On Windows you can use "flash.bat", it will ask you which COM ...