A smart home appliances control system based on digital electronics and GSM network

In current era, the Internet of Things (IoT) is becoming an important part of our daily life. It is employed in a variety of applications like smart cities, intelligent transportation, smart grid, wearables, etc. The aim of this project is to contribute to the evolution of Internet of Things (IoT) application in smart homes. It uses DTMF (Dual Tone — Multi-Frequency) connection to control the home appliances remotely via a GSM network. It overwhelms the confines of conventional wall switches, have to be functioned physically. The idea is to employ a DTMF decoder through which home appliances can be controlled by dialing a predefined number, via smart phone, for a specific load. It allows to operate the system globally via cellular phone. The system receives commands from a smartphone, decode it via a DTMF decoder and generates a digital output which passes through a CMOS based active low decoder and Flip Flops to activate or deactivate an intended load in the home. The load activation and deactivation activities are also logged on the cloud. It is done by observing the Flip Flops status via a front-end controller and passing this information to the server via a Bluetooth liaison. The server then updates the system status on the cloud via the Thingspeak liaison. The front-end electronics Truth Table and logic diagrams are presented. The system modules are modeled with Multisim and MATLAB. The simulation results have shown a proper system operation.