Home Control Switch Automation Using GSM Communication

Project and Seminar Material For Electrical Electronics Engineering EEE

Home Control Switch Automation Using GSM Communication


The advantage of cellular communication like GSM technology is a potential solution for such remote controlling activities. GSM-SMS technology can be used to control household appliances from remote places. Remotely, the system allows the home owner to monitor and control his house appliances via his mobile phone set by sending commands in the form of SMS message and receiving the appliances status as well. This system provides ideal solution to the problems caused in situations when a wired connection between a remote appliance device and the control unit might not be feasible.

The system is wireless and uses the user’s mobilethe system is more adaptable and cost effective. The system uses GSM technology thus providing ubiquitous access to the system for appliance control. With this hypothesis, three different approaches have been proposed and implemented in this project; FIRSTLY, home control switch/household appliances are controlled by server mobile which acts as remote control. SECONDLY, GSM-SMS messaging technology is used to control them from remote places and FINALLY, to provide a multiple agents environment.

Table of Content

Chapter One

  • 1.0 Introduction
  • 1.1 Project Objective
  • 1.2 Scope of the Project
  • 1.3 Operation of the System
  • 1.4 Architecture of the System

Chapter Two

  • 2.0 Literature Review
  • 2.1 System Description
  • 2.1.1 User GSM Mobile Handset
  • 2.1.2 Receiver GSM Handset
  • 2.2 Microcontroller Board
  • 2.3 Switching Module

Chapter Three

  • 3.0 Software Designing
  • 3.1 Transformer
  • 3.2 Transformer Calculation
  • 3.3 Rectification Process
  • 3.4 Microcontroller Section

Chapter Four

  • 4.0 Testing
  • 4.1 System Testing
  • 4.2 Packaging
  • 4.3 Trouble Shooting The Design

Chapter Five

  • 5.0 Problem Encountered
  • 5.1 Precautions
  • 5.2 Recommendation
  • 5.3 Conclusion
  • 5.5 Appendix
  • 5.4 Programme Codes
  • 5.6 Reference

Chapter One


Nowadays, people’s expectations in t technology is improving rapidly. People need an affordable system (smart) that can make their lives easier, more comfortable, and offer more safety. GSM based home automation system is an electrical and electronic system designed to control home appliance with a mobile phone. The two main technologies applied in the system are GSM and PLC. GSM stands for global system for mobile communication and PLC stands for power line communication. In this study, Nokia 6100 is chosen as the GSM phone that receives command and transfers it to controller. Due to rapidly advancing of mobile communication technology and widely availability make it possible to incorporate mobile technology into home automation systems. ’’AT’’ command is phone and microcontroller by passing through a serial interface RS232 with then help of its driver.

The project is based on the principle of GSM network, which enables the user to remotely control the operations of the appliances by using a mobile phone. In other word it would transform a normal home into an intelligent home. The controlling circuit is the most important component in communication and interface between home appliances. It was implemented by using peripheral interface controller (PIC) interfaced to mobile phone. The user can perform ON/OFF operations of the appliances just by pressing keypad of mobile phone.

The user sends GSM data in the form of SMS (short message service) message to switch ON or OFF any appliances at home such as lamp, air condition, fan and etc. the appliances may also provide the user with its current ON/OFF status. The system can be improved to provide the user with information about the status of each appliance.

Project Objectives

The objectives of this project are as follows;

  1. To design and develop home appliances control system over GSM network by using a mobile phone.
  2. To determine and understand on how the GSM works.
  3. To understand the architecture and programming of the PIC.
  4. To learn the troubleshooting and techniques.

Scope of the Project

The scopes of works in this project are;

  1. Mobile phone with SIM card enables the user to remotely control the operations of the appliances by communication to the GSM modem.
  2. GSM modem allows the capability to send and receive SMS to and from the mobile phone.
  3. RS-232 is the basic serial communication cable that will be used to interface between GSM modem and PIC microcontroller.
  4. PIC microcontroller will be interfaced to the control circuit that is connected to the appliances. It contains the software components through which the appliances are controlled and monitored.
  5. Relay and control circuit used to detect and control the condition of the home appliances.

Operation of the System

The system works as a remote sensing for the electrical appliances at home or industry to check whether it is ON or OFF, at the same time the user can control the electrical appliances at home by sending SMS message into the system, for example, turning on the AC before returning home. in case of fire/security the chip will receive signals from the different sensors in the monitoring place and acts according to the received signal by sending an SMS message to user’s mobile phone, it also works as automatic and immediate reporting to the user

in case of emergency for home security, as well as immediate and automatic reporting to the fire brigade and police station according to activated sensor to decrease the time required for tracking action.

A sketch of overall design of the home appliances control using GSM is shown in the figure below.

FIG; Simplified block diagram of home appliances

Diagram and Figure is in the complete material

Architecture of the System

It can be implemented to any levels of the security system. The architecture of the system mainly consists of three components the GSM MODEM and the interface circuit that include the different sensors used. The function of the GSM MODEM is the remote communication between the user and the controller through the RS232 serial communication standard. The function of the controller is to continuously check the inputs coming from the different sensor and send message through the GSM network in case of emergency such that it acts as a 24hours monitoring and continuously checking for any received message from the user through the GSM MODEM to switch on the AC for example

Chapter Five

Problem Encountered, Precautions, Summary and Recommendations

Problem Encountered

  1. Inconsistent supply of power from NEPA.(national electric power authority) this made the project go at snail pace.
  2. Writing, running and debugging of the programme was the most stressful. In order to develop a working program a lot of brain storming was done.
  3. Running around to source components for the project was really herculean as some of the components are not even around us in the east.


Precautions were taking in both construction techniques and during the testing

period. These precautions were taken in areas as follows;

  1. The design was first carried out on a bread board, tested and verified before transferring it to the Vero board. This was to ensure reduced component damage.
  2. At soldering stage, caution was taken to avoid direct heating of the electronic components used to avoid damage since some components are easily affected by heat.
  3. Precaution was also taken during the testing of the program stored in the microcontroller to avoid the system not working properly.


In the paper low cost, secure, ubiquitously accessible, auto configurable, remotely controlled solution for automation of homes has been introduced. The approach discussed in the paper has achieved the target to control home appliances remotely using the SMS-based system satisfying user needs and requirements. The extensive capabilities of this system are what make it so interesting. From the convenience of a simple cell phone, a user is able to control and monitor virtually any electrical device in a household. By connecting all the appliances with the system through power line communication or wireless to the system, all electrical household appliances can be controlled by sending a message from a mobile handset.

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