Gsm based smart home application

A smart home automation system which communicates with Smart Phones over 3G network, is developed in this Thesis study. More than one communication technique are used to receive status data from home, and electrical devices at home can be administrated by using relays. Two electronic circuits were designed to control electrical devices. These are central unit and environment units (RF modules). Sensors on environment (RF) modules collect information. Motion, temperature and fire sensors are used in this project. Any electrical device is being controlled over relays. Relays are on environment (RF) modules card. This units transmits information to central unit via radio frequency. The most important advantage is being able to work in 100 meters. Otherwise we have to use wires for connections from all units to central unit; this is not a desired solution for a home. Determining the sender of a message during wireless (RF) communication is possible by naming environmental units. This units are named as Oda1, Kapi1, Kapi2 in this work. Units are determining their own name after checking logical status of dip-switches in circuit. 16 bytes message packages are prepared and sent. First two bytes carry target unit, third and fourth bytes carry sender information. The receiver environment (RF) modules can determine the target unit, they send the data or activate/deactivate the controlled relays. A network communication module for transmitting over internet, and a central RF communication module which can collect data and send commands are designed. Central RF communication module sends messages to all RF units periodically to make them send their status data. It sends received environment status data to central controller. Central controller displays this information on LCD screen. Central unit can also interpret received messages from Internet via network controller module and it can reply messages coming from mobile phones. User can adjust IP network settings and central controller can keep this information by writing it to ROM. Home automation software which is developed on Android environment, communicates with designed electronic board and let user receive information and manage devices via Internet. This software can conduct three separated processes at the same time; Interpreting entered data via touch screen, sending data over internet and listening network to receive data coming from central unit. Thus; a system working with two-way principle, is designed successfully. To conclude, the output of subject thesis is a Smart Home Automation System designed with sensors and microprocessors; which let users to receive information and manage home remotely. This project lets users to use their smart phones which are an important part of our daily life, to manage devices remotely and check their home's status.