An Arduino Nano controls two relays which in turn can turn the car on, start it, and turn it off. Instead of adding a button for “push to start” he opted for a 13.56MHz RFID module.

Security researcher [Fran Brown] sent us this tip about his Tastic RFID Thief ... AA batteries and a custom PCB using an Arduino Nano to interpret the reader’s output. When the reader sees ...

The project relies on the built-in Wi-Fi module of the Arduino Yun, and the microcontroller is connected to the sensors and RFID reader modules alongside an electronic strike to lock/unlock the door.