Nowadays, a smart phone has variety of uses and becomes one of the most important devices. This paper is described the design and implementation of a door opening system using smart phone through Wireless Fidelity (WiFi ) technology. There are different types for transmitting data wirelessly: Bluetooth WiFi…etc. It is used the Bluetooth technology to establish communication between user's smart phone and controller board. The prototype supports manual controlling and microcontroller controlling to open and close home door. By connecting the circuit with servo motor and connecting to the Arduino controller board, it can be controlled by a Bluetooth available to provide remote access from smart phone.