GSM Based Remote Switching System
Chapter One
Project Aims and objectives
The project “GSM control system” as the title suggests is aimed to construct a control system that enables the complete control of the interface on which it is based.
General objectives of the project are :
- To co-ordinate appliances and other devices through
- To effectively receive and transmit data via
- To eliminate the need of being physically present in any location for tasks involving the operation of appliances with household/office.
- Minimize power and time wastage
- It allows a great degree of freedom to an Individual.
CHAPTER TWO
LITERATURE REVIEW
Brief History of tone Recognition Device
Despite the fact that the largest stride in the development of tone recognition device has occurred in the past two decades. This aspect of technology really began with Alexander Graham Bells invention at about 1870. In this discovery, conversion of sound waves into electrical signals started the process of exploring scientific and mathematical basis for understanding tones.
Bell laboratories in the 50s developed the first effective tone recognition for numbers. At about 1970, the American research project agency (ARPA) after various researches on speech understanding developed the technology further focusing particularly on the fact that the objective of automatic tone recognition is the understanding of speech not merely words. By the 80s distinct types of products were available, they offered speaker-independent recognition useful for telephones transfer processing, development of large vocabulary voice recognition systems such that documents could be created by voice dictation (Kurzweil, Dragon IBM).
The last two decades has invariably experienced a developed of voice recognition to the point of real-time continuous speech systems with exceptional high accuracy.
Automatic Speech Recognition (ASR)
Automated speech recognition is the process by which a computer maps an acoustic speech signal to some form of abstract meaning of the speech.ASR applications focus on public services such as operator automation,operator assistance, voice- activated information retrieval, and voice dailing and many other similar tasks. Speech recognition should not be confused with dial-tone (DTMF) applications where the user must select from numbered options or spell out an account number using the telephone keypad. A speech application allows the user to answer questions and provide information using a normal speaking voice.
Many companies have already invested heavily in human-powered call centers or DTMF (touch-time) interactive voice response (IVR) systems. They are changing or adapting to ASR applications, because of cost savings and improvement in customer satisfaction and experience. It has been shown that automatic speech recognition application are far more popular with callers than DTMF menu systems.
In some parts of the world 80% of callers encountering a touch-tone menu system will quit or elect to transfer to the operator, with automatic speech recognition this situation can be eliminated.
No uniform single indigenous language is spoken throughout South Africa. Most people who are not so literate only speak their “mother’s language” due to lack of schooling opportunities and very little reading and writing skills.
As a result it is highly desirable that more ASR applications based on indigenous languages be developed and implemented.
In general ASR systems consist of three major modules namely, a signal processing front-end, acoustic modelling and language modelling.
Related works
During the course of research, some related works were found which are explained below
Dial2open GSM remote control and GSM alarm: the Dial2open GSM is a remote control switch that connects to the GSM mobile phone network. It enables one to open automated gate, barriers and garage doors using a mobile phone. Simply “speed-dial” the dial2open which identifies you as an authorized user and the automatic gate, barrier or door open. There is no call costs incurred when calling without answering easily programmed by SMS text message, authorized telephone numbers can be added or deleted as required.
GSM based device ON-OFF control especially designed for agricultural needs: the device consist of GSM modem, microcontroller, motor stater, relays, memory and display. If the user wants to control some devices in his house he/she have to send the SMS message indicating the operation of the device and then the system password, while the MODEM embedded with the system microcontroller receives SMS. The microcontroller will read SMS and check for the password the user had sent with the SMS. If the password is correct then it will check whether the massage is for switch ON or OFF the motor. According to the received message, the controller will switch on/off the relays. The device is password controlled; therefore only people who know thw device password are capable of controlling the device. The relay or buzzer are controlled by the microcontroller using single pins i.e. giving high means device will be switch on and vise versa. Sometimes it can be interchanged according to the transistors used to drive the devices.
GSM-Auto Remote control switch: the GSM-auto is a remote control switch, it connects to the cell phone and like a cell phone has its own cell phone number. The GSM-auto is activated by calling its cell phone number, it will recognize an authorized telephone number calling it, rejects the call without answering and switches on/off the device connected to it because it rejects the call without answering there is no call cost incurred. It has two independent relays switches with normally open or normally closed switch contacts, these can be programmed to switch on for a pre-determined length of time whenever the GSM-auto is called, alternatively the switches can be permanently switched ON or OFF by sending the GSM-auto a short message service (SMS). Applications include the remote control of Hein holiday homes, lighting, engine pre-heaters, aviation engine heaters, irrigation systems, water well pumps and reboots of remote servers and routers, arming and disarming security systems etc.
CHAPTER THREE
SYSTEM ANALYSIS AND DESIGN
METHODOLOGY
Initial approach to project designing and execution is to gather enough information in order to help speed up the operation once the actual work commences. Methodology is the study of how to perform scientific research. It is the part of any analysis or research that is used to find out what type of data is maintained, what fact to find and look for, how to find them and how to record them for usage. In order to achieve these, Structured System Analysis and Design Methodology (SSADM) were used. This is because; SSADM is an internationally accepted software engineering model mainly used in most result oriented analysis.
System Analysis
Analysis involves a detailed study of the current system, leading to specifications of a new system. Analysis is a detailed study of various operations performed by a system and their relationships within and outside the system. This is the total analysis given to all the data obtained during the cause of this project design. The reason for this analysis is to have the best possible design or the close adaptive designed principle for achieving my own project.
CHAPTER FOUR
IMPLEMENTATION, TESTING AND INTEGRATION
CHOICE OF DEVELOPEMENTTOOLS
To ensure a standardised object oriented program i used assembly language as the programming language that will run the circuit.
CHAPTER FIVE
SUMMARY, RECOMMENDATIONS AND CONCLUSION
SUMMARY OFFINDINGS
The design of this remote control system using GSM phone involves researches in different aspects of Electrical/Electronic Engineering. This includes power electronics, differential amplifier, telecommunication, digital electronics and software engineering. Thorough work was done in all these aspects of engineering before the work could be concluded the project is a clear indication of a multipurpose control done via the keypad tone reducing the manual efforts and time required while paying individual attention for controlling each device. For people who want to switch ON/OFF
and check status of device when they are not present. This research work saves time and energy of the individual. The system requires less design and implementation cost. For handicapped people, it may be really not entertaining to involve much in work and this system helps them to locate themselves in a place and operate the lights of their room, switch on the fan etc. in every aspect of our daily lives people ranging from scientist to handymen and farmers can make use of this system for controlling electric motor, sprinklers ,tanks and also several other devices making use of electricity.
LIMITATION OF STUDY
The project has certain limitations and a list of such includes:
- The receiver must reside in a location where a signal with sufficient strength can be received from a cellular phone
- Only devices with electrical controlling input ports will be possible targets for control.
- The controlling unit must be able to receive and decode
- Operation of the controlling unit is only possible through a cell phone with calls
RECOMMENDATION
A good practicing engineer should be up-to-date in terms of theory and practice. Very good theoretical knowledge should be backed up with a practical design knowledge in order to cement what was taught in the lectures.
In other words, to meet up with the technological demands of the country, Engineering Faculties in Universities and other technological institutes should consider and adopt the following recommendation:
- Practical designs should be part of any course taught in the education and training.
- Each department in the engineering faculties should have its own library that is well stocked with old and current books as well as an Internet facility.
- Project show-rooms should be provided for the exhibition of previous projects as this will in a very great way, act as a source of encouragement and challenge to the junior
- The standard of projects should be reviewed so as to keep up with technological trends.
- All the probable project topics should be given to the students at the end of their 4thyear for early preparation and development. This will also give the student enough time to do thorough research and produce a standard project.
- Students should be given practicable projects with obtainable system components.
- Lastly, the design is best implemented using a printed circuit board (PCB) technology for the circuit layout to produce a neat arrangement of
CONCLUSION.
This design and construction of a remote system using GSM network was carried out considering some factors, which includes availability of components, cost effectiveness of design, economic application, research materials, efficiency, portability and finally its durability. The system after completion and normal test met the expected design specification and performance. But misuse of the system by end users may probably lead to lapses in the system performance. The system was designed and constructed in such a way that maintenance and repairs are easily done in the case of faults. Soldering techniques and practical electronic were carefully studied and the experience gain from it was instrumental to the success of this project.
REFERENCES
- Douglas V. H. (1999). Microprocessor and Interfacing – programming and hardware .Tata McGraw Hill 2nd Edition
- http://cslu.cse.ogi.edu/asr/ .
- http://murray.newcastle.edu.au/users/staff/speech/home_pages/tutorial_sr.html.
- Jelinek F. (1997). Statistical Methods for Speech Recognition. Massachusetts Institute of Technology, Cambridge.
- John Iovine. (June 1995). DTMF IR Remote Control System.
- Rabiner L.R, Juang B.H. (1986). An introduction to HMMs. IEEE ASSP Magazine 3.
- Rabiner L.R., Juang B.H. (1993). Fundamentals of Speech Recognition. Prentice Hall, Englewood Cliffs, N.J.
- Robert L. Boylestad,,Louis Nashelsky. (1999). Electronic Devices and Circuit Theory (Eight Edition).
