SUBMITTED BY: SURYAKANT SAINI PRIYANKA YADAV DEEKSHA CHATURVEDI HOME APPLIANCES CONTROL THROUGH GSM MODULE.

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Presentation transcript:

SUBMITTED BY: SURYAKANT SAINI PRIYANKA YADAV DEEKSHA CHATURVEDI HOME APPLIANCES CONTROL THROUGH GSM MODULE

CONTENTS INTRODUCTION ABOUT IT SYSTEM DESCRIPTION HARDWARE DESCRIPTION USER GSM MOBILE HANDSET RECEIVER GSM HANDSET AT COMMAND MICROCONTROLLER BOARD PIC 16F877A SOME OTHER DEVICES SWITCHING MODULE ALGORITHM CONCLUSION

INTRODUCTION  The rapid growth of wireless communication motivated us to use mobile phones to remotely control a household appliance.  In this paper we describe a remote appliance control system which can control different household appliances by sending an SMS message from a mobile phone.  This controller is extremely handy at places where we have to control the ON and OFF switching of the devices but no wired connection to that place is available.  The microcontroller would then control and device based on the information given to it. The proposed solution will need to be easy to use, simple, secure, robust and be useful on most mobile phones.

This project is designed to make home automation easy to control when a user is not at home

ABOUT IT The project is designed to allow easy use of a mobile phone to control appliances in the home. Using a mobile phone the development of the control system will be carried out using SMS. This will communicate with another mobile phone, which in turn controls the devices attached to microcontroller modules. When the action has been carried out then a response is sent to the user

SYSTEM DESCRIPION  The system has divided two parts, namely; hardware and software HARDWARE:  The hardware architecture consists of a stand-alone embedded system that is based on 8-bit microcontroller (PIC16F877)  A GSM handset with GSM Modem and a driver circuit.  AT command supporting GSM mobile phone.  Relays

HARDWARE DESCRIPTION The GSM modem provides the communication media between the homeowner and the system by means of SMS. The SMS consists of commands to be executed. The format of the message is predefined. The SMS is sent to the GSM modem via the GSM public networks as a text message with a definite predefined format. Once the GSM modem receives the message, the commands sent will be extracted and executed by the microcontroller. The system will interpret the commands and turn the appliances ON/OFF accordingly via the switching module.

Cellular phone containing SIM (Subscriber’s Identifying Module) card has a specific number through which communication takes place. The mode of communication is wireless and mechanism works on the GSM (Global System for Mobile communication) technology. Here, the user transmits instructions to the system to control the appliance in the form of SMS User GSM mobile Handset

Receiver GSM Handset/GSM module  This receiver GSM handset is used to receive the SMS sent by the user.  After that it transmit an acknowledgement or status to the user’s mobile.  The receiver handset has to be equipped with an AT Modem and a valid SIM card.  The handset has a built in AT modem with UART interface and supports most of the AT command instructions.  This handset is attached with the microcontroller used to control the appliance through UART.  AT Modem is a Modem which supports AT commands, also known as Hayes command

HAYES COMMAND The Hayes command set is a specific command language originally developed for the Hayes Smart modem. The command set consists of a series of short text strings which combine together to produce complete commands for operations such as dialing, hanging up, and changing the parameters of the connection. Most modems follow the specifications of the Hayes command set. AT commands are instructions used to control a modem. AT is the abbreviation of ATtention. Every command line starts with "AT" or "at".

MICROCONTROLLER BOARD  This contains the micro-controller (PIC16F877) and a timeout generator circuit. This is the main module of the system.  On receipt of the SMS message, text words are checked with predetermined format which includes desired device ON/OFF command.  To read a message the microcontroller sends the appropriate AT command to the Receiver GSM Modem through UART. The Modem then responds with the message and the microcontroller stores the message in the RAM.  The time-out generator circuit performs the vital function of providing the microcontroller board with the ability to detect the end of a message from the receiver GSM mobile

PIC16F877

SOME OTHER DEVICES DIODE: The simplest semiconductor device is made up of a sandwich of P-type semi conducting material, with contacts provided to connect the p-and n-type layers to an external circuit. This is a junction Diode. If the positive terminal of the battery is connected to the p-type material (cathode) and the negative terminal to the N-type material (Anode), a large current will flow. This is called forward current or forward biased. If the connections are reversed, a very little current will flow. This is because under this condition, the p-type material will accept the electrons from the negative terminal of the battery and the N-type material will give up its free electrons to the battery, resulting in the state of electrical equilibrium since the N- type material has no more electrons. Thus there will be a small current to flow and the diode is called Reverse biased.

RESISTANCE Resistance is the opposition of a material to the current. It is measured in Ohms (  ). All conductors represent a certain amount of resistance, since no conductor is 100% efficient. To control the electron flow (current) in a predictable manner, we use resistors. Resistor can be divided into two groups viz. fixed & adjustable (variable) resistors. In fixed resistors, the value is fixed & cannot be varied. In variable resistors, the resistance value can be varied by an adjuster knob. Each resistance has four colors, one of the band on either side will be gold or silver, this is called fourth band and indicates the tolerance, others three band will give the value of resistance

CAPACITORS It is an electronic component whose function is to accumulate charges and then release it. Capacitors are of two types: - (1) fixed type like ceramic, polyester, electrolytic capacitors-these names refer to the material they are made of aluminum foil. (2) Variable type like gang condenser in radio or trimmer. In fixed type capacitors, it has two leads and its value is written over its body and variable type has three leads. In our project we have used ceramic, electrolytic capacitors

SWITCHING MODULE This module drives (switches ON/OFF) the appliance according to the command sent in the SMS. The switching module is controlled by the microcontroller. The switching module may be in the form of a relay which allows a low power circuit to switch a relatively high current on or off. Example a bulb connected to the 220V mains supply through a swithing module(relays)

ALGORITHM Upon power up the microcontroller initializes the AT Modem. During initialization the microcontroller configures the Modems UART speed, message format etc. to be used. After the initialization is complete the microcontroller continuously checks the Modem for any new message. Upon receipt of a message the microcontroller reads the message and extracts the command and authentication information. The authentication information may be the remote user’s mobile phone number or a text string sent along with the message for command.

After the authentication is verified the microcontroller then sends the appropriate control signal to the switching module to control the appliance. The command is executed and the devices are switched ON or OFF according to the command.

CONCLUSION In the synopsis low cost, secure, ubiquitously accessible, auto configurable, remotely controlled solution for automation of homes has been introduced. 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.

THANK YOU