The Design And Implementation Of Automatic Control And Monitoring System For Smart Home

With the continuous development of our economy and society, the performance of the microprocessor chip is significantly improved and the price is significantly declined.Especially Android phones are largely used, a variety of applications based on Android appear all the time. It makes people’s lives easier, and largely changed people’s way of life. The real monitoring system of smart home based on android terminal has a broad prospect of application for it brings about safety, energy conservation, convenience and comfort to family life. It is also a major trend in the future development of smart appliances.A kind of auto-control and monitoring system of smart home possessing features such as cost performance, perfect function and flexibility of debugging and extending is designed and implemented.Wireless sensing and control system comprised of nRF24L01 modules covers the entire family, and its controlling kernel includes STM32 embedded processor and Linux network processor. On the other hand, this system monitor the parameters of temperature and humidity, light intensity and other environmental by Android phones and set temperature threshold by STM32 to control the Relay closed in order to turn off the power. Meanwhile, this system realizes the function of using mobile terminal to control infrared interface smart appliances and relay.The system is divided into four parts to design. First, we design the drivers of DS18B20 temperature sensor and relay sensor and build temperature and relay wireless sensor networks and realize the function of cutting off the power by automatic controlling relay closed when the temperature exceeds a certain threshold. Secondly, we design the drivers of DHT11 temperature and humidity sensors and infrared emitters and relay and photosensitive resistance and other hardware which directly connected with the STM32, and design program to collect the temperature and humidity and light intensity which is passed through the serial port to Linux network processor module. Third, configuring the web server, designing Lua scripting language to make Linux network processor receive serial data and send control commands. Finally, designing Android client to achieve control and monitoring functions.