Arduino based safeguarding system by using sound

Based on Arduino, a security system model is presented in this paper. Knock pattern is produced with the construction of piezo sensor and Arduino series board. The Knock detector is a distinctive way to open a gate without a key. Then a programmed `undisclosed' knock sequence is allowed to open the gate. When the `undisclosed' knock sequence is detected by the electronic board, the gate is opened. In this way, the gate or door is opened by the user. This research work uses an Arduino microcontroller board to sense knocks on a door, and to compare the timing ratio between knocks to a secret knock. The effects are known from the glow of LED's connected to the board. It is a unique way of keeping the system secure with current technology.