28-09-2013, 04:57 PM
GSM based A.C. Applications
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Introduction to Project
“GSM based A.C. Applications” implements the emerging applications of the GSM technology. Using GSM networks, a control system has been proposed that will act as an embedded system which can monitor and control appliances and other devices locally using built-in input and output peripherals.
Remotely the system allows the user to effectively monitor and control the house/office appliances and equipments via the mobile phone set by sending commands in the form of SMS messages and receiving the appliances status. The main concept behind the project is receiving the sent SMS and processing it further as required to perform several operations. The type of the operation to be performed depends on the nature of the SMS sent.
The principle in which the project is based is fairly simple. First, the sent SMS is stored and polled from the receiver mobile station and then the required control signal is generated and sent to the intermediate hardware that we have designed according to the command received in form of the sent message. The messages are sent from the mobile set that contain commands in written form which are then processed accordingly to perform the required task.
A microcontroller based system has been proposed for our project. There are several terminologies that are used extensively throughout this project report.GSM (Global System for Mobile Communications): It is a cellular communication standard.SMS (Short Message Service): It is a service available on most digital mobile phones that permit the sending of short messages (also known as text messaging service).
Background
The new age of technology has redefined communication. Most people nowadays have access to mobile phones and thus the world indeed has become a global village. At any given moment, any particular individual can be contacted with the mobile phone. But the application of mobile phone can not just be restricted to sending SMS or starting conversations. New innovations and ideas can be generated from it that can further enhance its capabilities.
Technologies such as Infra-red, Bluetooth, etc which has developed in recent years goes to show the very fact that improvements are in fact possible and these improvements have eased our life and the way we live. Remote management of several home and office appliances is a subject of growing interest and in recent years we have seen many systems providing such controls.
These days, apart from supporting voice calls a mobile phone can be used to send text messages as well as multimedia messages (that may contain pictures, graphics, animations, etc). Sending written text messages is very popular among mobile phone users. Instant messaging, as it is also known, allows quick transmission of short messages that allow an individual to share ideas, opinions and other relevant information.
Description:
The figure shown above is the simple block diagram of our project. It is a simple illustration of how we have implemented our project and the various parts involved in it. From the above representation, the first Mobile station is used as a transmitting section from which the subscriber sends text messages that contain commands and instructions to the second mobile station which is based on a specific area where our control system is located.
The received SMS message is stored in the SIM memory of the phone and then extracted by the microcontroller and processed accordingly to carry out specific operations. The relay driver is used to drive the relay circuits which switches the different appliances connected to the interface. The LCD is used to indicate the status of the operation performed by the microcontroller and also its inclusion makes the overall system user-friendly.The input from different sensors are feed to micro-controller and processed to operate respective task semi autonomously and autonomously.
Scopes and Purpose of System Specification
The system specification shows the description of the function and the performance of system and the user. The scope of our project “GSM Based A.C. Applications” is immense. The future implications of the project are very great considering the amount of time and resources it saves. The project we have undertaken can be used as a reference or as a base for realizing a scheme to be implemented in other projects of greater level such as weather forecasting, temperature updates, device synchronization, etc. The project itself can be modified to achieve a complete Home Automation system which will then create a platform for the user to interface between himself and the household.
GSM TECHNOLOGY
GSM is a global system for mobile communication GSM is an international digital
cellular telecommunication. The GSM standard was released by ETSI (European
Standard Telecommunication Standard) back in 1989. The first commercial services were
launched in 1991 and after its early introduction in Europe; the standard went global in
1992. Since then, GSM has become the most widely adopted and fastest-growing digital
cellular standard, and it is positioned to become the world’s dominant cellular standard.
Today’s second-generation GSM networks deliver high quality and secure mobile voice
and data services (such as SMS/ Text Messaging) with full roaming capabilities across
the world.
SHORT MESSAGE SERVICE
SMS stands for Short Message Service. It is a technology that enables the sending and
receiving of message between mobile phones. SMS first appeared in Europe in 1992. It
was included in the GSM (Global System for Mobile Communication) standards right at
the beginning. Later it was ported to wireless technologies like CDMA and TDMA. The
GSM and SMS standards were originally developed by ETSI. ETSI is the abbreviation
for European Telecommunication Standard Institute. Now the 3GPP (Third Generation
Partnership Project) is responsible for the development and maintenance of the GSM and
SMS standards.
SMS Service Providers (SMS Gateway Providers, SMS Resellers, SMS
Brokers)
There is a demand for SMS connectivity from applications that does not require the
sending or receiving of large amount of SMS messages. One example is a remote
monitoring system. If the remote monitoring system finds that a certain server is not
responding, it will send an SMS alert to the system administrator mobile phone. This
remote monitoring system will have a very small amount of SMS traffic per month since
the servers being monitored should be working fine most of the time.
Since a wireless carrier usually doesn’t provide direct SMSC or SMS gateway access to
user without a large amount of SMS traffic, some companies come out to fill the gap.
These companies are called SMS service providers.
Conclusion
The project we have undertaken has helped us gain a better perspective on various
aspects related to our course of study as well as practical knowledge of electronic
equipments and communication. We became familiar with software analysis, designing,
implementation, testing and maintenance concerned with our project.
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 devices. This makes it possible for users to rest assured that their belongings are
secure and that the television and other electrical appliances was not left running when
they left the house to just list a few of the many uses of this system.
The end product will have a simplistic design making it easy for users to interact with.
This will be essential because of the wide range of technical knowledge that homeowners
have.