Today is a world of advanced ubiquitous mobile applications which are used exhaustively to save time and energy. These applications ease day-to-day life of a common man. Based on these technologies and applications the authors designed a home automation system. In this paper, they propose design and prototype implementation of home automation system that uses Wi-Fi technology and Android operating system. An attractive market for home automation system is for busy families and individuals with physical limitations. Users can control electrical appliances in home or office via Smartphone.