RTOS based Energy Efficient Smart Home

Abstract

The features of Android like its Connectivity , Java support has been widely used in many applications .
This paper presents the design and implementation of a low cost yet compact and wide range Android smart
phone based home automation system. This project is based on the popular Arduino prototyping board where the electrical
appliances are interfaced with ports of the board . In order to make the system energy efficient , we’ve used some
sensors to analyse the current environmental conditions so as to provide energy ef iciency . To handle these various
operations we have integrated a popular RTOS, the scmRTOS, which has a very small footprint on the
microcontroller. An Android application which has been developed for Android devices is used for interation between user
and system .A typical wireless home automation system allows one to control house hold appliances from a
centralized control unit which is wireless. The project demonstrates a system that can be integrated as a single
portable unit and allows one to wirelessly control lights, fans, water sprinkler etc. and turn on or off any appliance , get the
status of dif erent sensors and take decision accordingly.The project also deals with contolling the fan speed, light
intensity by limitting the amount of current supplied to appliances. The medium used f or sending and receiving of
commands is WiFi which is again of the feature of Android system and at the control unit XBee transceiver is used for
same purpose. The remote system receives the commands through XBee transceiver and performs the request
function. The sensors unit is capable of detecting chnages in environmental conditions like temperature, soil moisture and can
accordingly turn on or off appliances such as lights and fans and in the meantime send its status back to base station.