The system’s objective is to provide a method to transfer data over ultra sonic sound waves. Our implementation is using normal range sound waves due to speaker and microphone hardware limitations.
The system consists of two parts: Transmitter: A java based application that transmits a string password as acoustic beeps. Receiver: An arduino circuit that listens for the beeps sequence, analyze it and checks if the password matches to the saved password.
Working example: http://www.youtube.com/watch?v=vDRrlv_9ZcY