Sistema de automação residencial de baixo custo com uso de rádio frequência

Abstract

This work presents a proposal of a home automation system, which will use as human-machine (HMI) interface a mobile device with Android operating system. This mobile/tablet communicates with a central (controller) installed in the residence via the Internet. The central communicates with a central microcontroller via Bluetooth. From the central microcontroller the message is distributed over wireless communication network that connects multiple controllers. The controllers are microcontrollers with wireless communication performing tasks via HMI. For the purpose of demonstrating the working topology some devices (modules) are equipped with infrared LED's to control home electronics with a conventional remote control. Other modules are equipped with relays to drive different electrical loads. With these controllers, the system is capable of operate devices driven by infrared remote control type, such as televisions, DVD players, air conditioners and others. It is also possible to the lighting of the house, turning on and off lights. Through the control of lighting systems, air conditioners and multimedia, in each room, the application is able to generate scene modes. The employed wireless communication network uses the tree (hierarchical) architecture type. Routing the message from the central to end devices through point-to-point communications. All wireless communications received is encrypted by an algorithm based on password generated by date in order to protect the data packet providing safety against possible intentional invasions or not your system. The main aspect of the project is the modularity of its drivers (modules), because at the time the network is implemented there could be other devices with different functions to control different devices of our system. The system was economically viable and has simple installation as it is not necessary cabling between the controllers and the central. The encryption algorithm in communication has given security to messages sent via radio frequency and routing of messages secured the increase in range of the network.