IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is an open access international journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Microcontroller remote controlling projectBipro Roy
Microcontroller based remote controlling project using mobile phone. with implementing this u can remotely control ur home appliances like fan, light, tv even industrial machines through a mobile phone being in a long distance.
Project Report on HOME AUTOMATION USING DTMF.
The Project “Home Automation using mobile communication” has different sections such as:
1.Microcontroller
2.DTMF decoder
3. Relays
. This project we propose a unique System for Home automation utilizing Dual Tone Multi Frequency (DTMF) that is paired with a wireless module to provide seamless wireless control over many devices in a house. This user console has many keys, each corresponding to the device that needs to be activated. The encoder encodes the user choice and sends via a GSM transmitter. The GSM receiver receives the modulated signal and demodulates it and the user choice is determined by the DTMF decoder. Based upon this the required appliance is triggered.
Microcontroller remote controlling projectBipro Roy
Microcontroller based remote controlling project using mobile phone. with implementing this u can remotely control ur home appliances like fan, light, tv even industrial machines through a mobile phone being in a long distance.
Project Report on HOME AUTOMATION USING DTMF.
The Project “Home Automation using mobile communication” has different sections such as:
1.Microcontroller
2.DTMF decoder
3. Relays
. This project we propose a unique System for Home automation utilizing Dual Tone Multi Frequency (DTMF) that is paired with a wireless module to provide seamless wireless control over many devices in a house. This user console has many keys, each corresponding to the device that needs to be activated. The encoder encodes the user choice and sends via a GSM transmitter. The GSM receiver receives the modulated signal and demodulates it and the user choice is determined by the DTMF decoder. Based upon this the required appliance is triggered.
Wireless Communication via Mobile Phone Using DTMF Vivek chan
This presentation of CyberLab describes complete process that how can we use a mobile phone as a remote control by using DTMF Decoder IC on Second End. Complete circuit diagram and working process is given in slides.
Cell Phone Controlled Home Automation System using DTMF TechnologyTaufique Sekh
This home appliances control or home automation project uses DTMF decoder circuit to control home and office electrical appliances. Just connect your cell phone headset (headphone) jack to the mobile phone and then mobile will control electrical appliances and electrical equipment through the DTMF key pad of your cell phone. Here for demonstrating, we are controlling an electrical bulb using this circuit project but you can extend this circuit to control many electrical devices with some modifications using4×16 decoder IC.
Arm Robot Surveillance Using Dual Tone Multiple Frequency TechnologyIJERA Editor
Surveillance place a pivotal role in addressing a wide range of security challenges .In the present paper we propose a Dual Tone Multiple Frequency ( DTMF) based Robot with video surveillance. In the proposed model a DTMF based Robot with video surveillance with multiple key functions, Arm picker and security system was implemented. Master and slave concept using 3 Microcontroller and motor driver IC to drive motors was implemented and belt wheel platform was used to move the robot from one place to another. Multiple key functions were used to perform more functions and a camera for surveillance .The robot can navigate with the help of the user.
Challenging Retrieval Scenarios: Social Media and Linked Open DataThomas Gottron
Invited talk given in April 2012 at USI in Lugano at the IR research group of Fabio Crestani. Review of the work on Interestingness on Twitter and schema based indices on Linked Open Data (SchemEX).
Wireless Communication via Mobile Phone Using DTMF Vivek chan
This presentation of CyberLab describes complete process that how can we use a mobile phone as a remote control by using DTMF Decoder IC on Second End. Complete circuit diagram and working process is given in slides.
Cell Phone Controlled Home Automation System using DTMF TechnologyTaufique Sekh
This home appliances control or home automation project uses DTMF decoder circuit to control home and office electrical appliances. Just connect your cell phone headset (headphone) jack to the mobile phone and then mobile will control electrical appliances and electrical equipment through the DTMF key pad of your cell phone. Here for demonstrating, we are controlling an electrical bulb using this circuit project but you can extend this circuit to control many electrical devices with some modifications using4×16 decoder IC.
Arm Robot Surveillance Using Dual Tone Multiple Frequency TechnologyIJERA Editor
Surveillance place a pivotal role in addressing a wide range of security challenges .In the present paper we propose a Dual Tone Multiple Frequency ( DTMF) based Robot with video surveillance. In the proposed model a DTMF based Robot with video surveillance with multiple key functions, Arm picker and security system was implemented. Master and slave concept using 3 Microcontroller and motor driver IC to drive motors was implemented and belt wheel platform was used to move the robot from one place to another. Multiple key functions were used to perform more functions and a camera for surveillance .The robot can navigate with the help of the user.
Challenging Retrieval Scenarios: Social Media and Linked Open DataThomas Gottron
Invited talk given in April 2012 at USI in Lugano at the IR research group of Fabio Crestani. Review of the work on Interestingness on Twitter and schema based indices on Linked Open Data (SchemEX).
IOSR journal of VLSI and Signal Processing (IOSRJVSP) is an open access journal that publishes articles which contribute new results in all areas of VLSI Design & Signal Processing. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced VLSI Design & Signal Processing concepts and establishing new collaborations in these areas.
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is an open access international journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is an open access international journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
IOSR Journal of Humanities and Social Science is an International Journal edited by International Organization of Scientific Research (IOSR).The Journal provides a common forum where all aspects of humanities and social sciences are presented. IOSR-JHSS publishes original papers, review papers, conceptual framework, analytical and simulation models, case studies, empirical research, technical notes etc.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Aim of project is to make use of mobile phone to control robot movement
The movement is controlled by pressing relevant keys on a mobile phone that makes a call to another mobile phone attached to the robot.
A proof of concept how a land rover could be handled using a cell phone. Using a MT8870 series DTMF decoder, Atmega16 AVR microcontroller, L293D motor driver and 74LS04 NOT gate.
Although the appearance and the capabilities of robots vary vastly, all robots share the feature of a mechanical, movable structure under some form of control. The Control of robot involves three distinct phases: perception, processing and action. Generally, the preceptors are sensors mounted on the robot, the processing is done by the on-board microcontroller or processor, and the task is performed using motors or with some other actuators.
Part of our 3rd year-end Summer project.
Abstract: Traditionally electrical appliances in a home are controlled via switches that regulate the electricity to these devices. As the world gets more and more technologically advanced, we find new technology coming in deeper and deeper into our personal lives even at home. Home automation is becoming more and more popular around the world and is becoming a common practice. The process of home automation works by making everything in the house automatically controlled using technology to control and do the jobs that we would normally do manually. Home automation takes care of a lot of different activities in the house. this project we propose a unique System for Home automation utilizing Dual Tone Multi Frequency (DTMF) that is paired with a wireless module to provide seamless wireless control over many devices in a house. This user console has many keys, each corresponding to the device that needs to be activated. The encoder encodes the user choice and sends via a FM transmitter. The FM receiver receives the modulated signal and demodulates it and the user choice is determined by the DTMF decoder. Based upon this the required appliance is triggered. Dtmf access the control unit, the user should send an authentication code (DTMF) along with their quire/desired function/action to his/her home control system via Global System for Mobile communication (GSM). Upon being properly authenticated, the cell phone-based interface at home (control unit) would relay the commands to a microcontroller that would perform the required function/action, and return a function completion code that would be sent to the source of the original command (user’s cell phone).
What is DTMF Decoder , introduction , working of DTMF Decoder , block diagram of DTMF Decoder , components and Implementation of DTMF Decoder
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Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
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http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
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The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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Overview on Edible Vaccine: Pros & Cons with Mechanism
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1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676 Volume 4, Issue 6 (Mar. - Apr. 2013), PP 38-42
www.iosrjournals.org
Microcontroller Based Reprogrammable Digital Door Lock
Security System by Using Keypad & GSM/CDMA Technology
Mohammad Amanullah
(Lecturer, Department of Computer Science and Engineering, International Islamic University Chittagong.
Bangladesh.
Abstract: Now a day’s Security has been a prime concern in the home or office management. Digital door lock
security system provides security and safety to house or office owners, belongings, assets from being damaged
by external agent or undesired strangers. We have used a new technology, incoming number verification system
which gives more protection for controlling & security system. As Conventional security system does not use
any password, there is a chance to hack or break the system. In this regard we used a desire mobile number
without verification which doesn’t allow the door to be opend.This system is composed of the microcontroller
based by using matrix keypad & GSM/CDMA network. The microcontroller based digital door lock security
system is an access control system that allows only authorized persons to access restricted area. The password
is stored in PROM so that we can change it any time. The system has a matrix keypad .When anyone enter the
code in the matrix keypad, microcontroller verify the codes. If that code is correct the device will operate and
the door will be open. But if someone enter wrong code a red signal will be shown which means that the entered
code is wrong.GSM/CDMA module can be used to operate the device, when anyone make a call from his mobile
the receiving device which is set in main circuitry will receive the call. If the call is from desired number then
operate the device and the door will be unlocked. An IPS circuit can be used for giving backup in case of
emergency when there is a power failure.
Keywords: DTMF encoder and decoder, Global System for Mobile Communication, Micro-Controller, Mobile
phone, and Matrix Keypad.
I. Introduction
Tones generated from DTMF keypad can identify what unit we want to control, as well as which
unique function we want to perform. A standard 4*4 matrix keyboard can be used support either DP or DTMF
modes.DTMF encoder technologies does not require any radiation or any laser beam, not harmful, no limitation
of range. It can be used from any distance using a simple telephone line or mobile phone. The UM91214B is a
single chip, silicon gate. It provides dialing pulse (DP). IC UM91214B is consists of telephone set which is
present in the remote place (Be your workspace) signal are sent through this telephone or mobile. For
GSM/CDMA based controlling system, press a button in the telephone set keypad, a connection is made that
generates a resultant signal of two tones at the same time. These two tones are taken from row frequency and
column frequency. The resultant frequency signal is called “Duel Tone Multiple Frequency “These tone are
identical and Unique.MT-8870 operating function include a band split filter that separates the high and low
tones of the received pair, and a digital decoder that verifies both the frequency and duration of the received
tones before passing the resulting 4-bit code to the output bus.
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2. Microcontroller Based Reprogrammable Digital Door Lock Security System By Using Keypad &
II. System Architecture & Operation:
Fig 1. Shows the block diagram of the system.
In the above fig1.shows block diagram of the system keypad are a part of human machine interface where
human interaction or human input is needed and play an important role in a small embedded system. A digital
encoder is a device that converts tone signal into a sequence of digital pulse. By counting a single bit or by
decoding a set of bits, the pulse can be converted to relative or absolute pulse can be converted to relative or
absolute position measurement.DTMF decoder detects the dial tone from a cell phone and decodes the keypad
pressed on the remote cell phone. Microcontroller units are used for special or fixed type operation.
Microcontrollers are used in automatically controlled products and devices, such as remote control, appliances
etc.Relay interfacing unit interface between the loads and controlling circuit. A relay is a protective device
driven from controlling circuit directly.LED unit indicates the “ON” “OFF” position of the connected load. If
LED is turn ON, then corresponding load is ON. When LED is OFF then corresponding load is OFF.DOOR
have been used as LOAD.
III. Design of System Hardware
System hardware designing composed of ENCODER, DECODER and MICROCONTROLLER. These
are consists of matrix keypad, IC-UM91214B, IC-(MT8870D), IC-(PIC-16F628A), Zener diode, LED, Resistor,
Capacitor, Relay. Microcontroller verifies the codes. Encoder is a device that converts tone signal into sequence
of digital pulse. Decoder detects the dial tone from a telephone line and decodes the keypad pressed on the
remote telephone. Fig 2. Is the circuit diagram of digital door lock security system and Fig 3. Shows practical
implementation.
www.iosrjournals.org 39 | Page
3. Microcontroller Based Reprogrammable Digital Door Lock Security System By Using Keypad &
Fig 2. Circuit diagram of Digital Door lock security system.
Fig 3. shows the practrical implementation of the circuit.
IV. Selection Of MICROCONTROLLER:
Microcontroller is special types of processor which we used for special or fixed type operation. A
Microcontroller is a small computer on a signal integrated circuit containing a processor core, memory and
programmable input/output peripherals. The main function for PIC16F628A microcontroller which specify the
ON and OFF state of the switches. The program for the microcontroller is designed in such a way that when we
make a call from our transmitting device, it would be automatically received by Decoder circuit and it will offer
a password code for security purpose. After verifying the password code it will give the access to operate the
circuit.
V. Working of IC Mt8870:
The MT-8870 is a full DTMF receiver that integrates both band split filter and decoder function into a
single 18-pin DIP. Its filter section uses switched capacitor technology for both the high and low group filters
and for dial tone rejection. Its decoder uses digital counting techniques to detector and decodes all 16 DTMF
tone pairs into a 4-bit code. External component count is minimized by provision of an on-chip differential input
amplifier clock generator and latched tri-state interface bus.MT-8870 operating functions include a band split
filter that separates the high and low tones of the received pair, and a digital decoder that verifies both the
frequency and duration of the received tones before passing the resulting 4-bit code to the output bus.
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4. Microcontroller Based Reprogrammable Digital Door Lock Security System By Using Keypad &
VI. Working of IC Um91214b:
This unit consists of telephone set which is present in the remote place. This may be workspace (office/
school) phone or mobile phone or a phone in PCO. Signals are sent through this telephone. It uses DTMF
encoder integrated circuit, chip UM91214B.This IC produces DTMF signals. It contains four row frequencies &
three column frequencies. The pins of the IC91214B from 12 to 14 produces high frequency column group and
pins from 15 to 18 produces the low frequency row group. By pressing any key in the keyboard corresponding
DTMF signal is available in its output pin at pin no 7.For producing the appropriate signals it is necessary that a
crystal oscillator of 3.58MHz is connected across its pins 3 & 4 so that it makes a part of its internal oscillator.
This encoder IC requires a voltage of 3V.For that IC is wired around 4.5 battery and 3V backup VCC for this IC
is supplied by using 3.2V zener diode. By pressing the number 5 in the keypad the output tone is produced
which is the resulting of addition of two frequencies at pin no 13 & 16 of the IC and respective tone which
represents number „5‟ in keypad is produced at pin no 7 of the IC (This signal is sent to the local control system
through telephone line via exchange).
VII. Keypad Matrix:
Password is given in our system by using keypad. Keypad may be similar as telephone set‟s keypad.
Function of this keypad is also same as the telephone. When you press buttons on the keypad, a connection is
made that generates two tones at the same time. A “Row” tone and a “column” tone. These two tones identify
the key you pressed to any equipment you are controlling. If the keypad is on your phone, the telephone
company‟s “central office “equipment knows what number you are dialing by these tones, and will switch your
call accordingly. If you are using a DTMF keypad to remotely control equipment, the tones can identify what
unit you want to control, as well as which unique function you want it to perform. When you press the digit 1 on
the keypad, you generate the tones 1209 Hz and 697 Hz. Pressing the digit 2 will generate the tones 1336 Hz
and 697 Hz. Sure, the tone 697 is the same for both digits, but it takes two tones to make a digit and the
decoding equipment knows the difference between the 1209 Hz that would complete the digit 1, and a1336 Hz
that completes a digit 2.There are many methods but the basic logic is same .
VIII. GSM/CDMA BASED CONTROLLING SYSTEM
If you press a button in the telephone set keypad, a connection is made that generates a resultant signal
of two tones at the same time. These two tones are taken from a row frequency and a column frequency. The
resultant frequency signal is called “DTMF”. In GSM, DTMF signal is discretized.These tones are identical and
unique. A DTMF signal is the algebraic sum of two different audio frequencies, and can be expressed as
follows:
F(t)=A₀ Sin(2* *fa*fb*t)+B₀ Sin(2*∏*fa*fb*t)………>(1)
Where fa and fb are two different frequencies A and B as their peak amplitudes. Each of the low and high
frequency groups comprise four frequencies from the various keys present on the telephone keypad. Two
different frequencies, one from the high frequency group and another from the low frequency group are used to
produce a DTMF signal to represent the pressed key. The amplitude of the two sine waves should be such that
(0.7<(A/B)<0.9)V……………………………………………………(2)
The frequencies are chosen such that they are not the harmonics of each other. The frequencies associated with
various keys on the keypad. When you send these DTMF signals to the telephone exchange through cables, the
servers in the telephone exchange identifies these signals and makes the connection to the person you are
calling.
IX. FILTER SECTION
Separation of the low-group and high group tones is achieved by applying he DTMF signal to the
inputs to two sixth-order switched capacitor band pass filters, the bandwidths of which correspond to the low
and high group frequencies. The filter section also incorporates notches at 350 and 440 Hz for exceptional dial
tone rejection.
Each filter output is followed by a single order switched capacitor filter section which smoothes the
signal prior to limiting. Limiting is performed by high- gain comparators which are provided with hysteresis to
prevent detection of unwanted low-level signals. The outputs of the comparators provide fill rail logic swings at
the frequencies of the incoming DTMF signals.
The filter also incorporates notches at 350 and 440 Hz, providing excellent dial tone rejection. Each
filter output is followed by a single-order switched capacitor section that smoothes the signals prior to limiting.
Signal limiting is performed by high gain comparators provided with hysteresis to prevent detection of
unwanted low-level signals and noise. The MT-8870 decoder uses a digital counting technique to determine the
frequencies of the limited tones and to verify that they correspond to standard DTMF frequencies. When the
detector recognizes the simultaneous presence of two valid tones (known as signal condition), it raises the Early
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5. Microcontroller Based Reprogrammable Digital Door Lock Security System By Using Keypad &
Steering flag(ESt). Any subsequent loss of signal condition will cause ESt to fall. Before a decoded tone pair is
registered, the receiver checks for valid signal duration( referred to as character recognition-condition) this
check is performed by an external RC time constant driven by ESt. a short delay to allow the output latch to
settle, the delayed steering output flag(StD) foes high, signaling that a received tone pair has been registered.
The contents of the output latch are made available of the 4-bit output bus by raising the three state control
input(OE) to logic high. Inhibit mode is enabled by a logic high input to pin 5(INH). It inhibits the detection of
1633 Hz.
The output code will remain the same as the previous detected code. On the MT-8870 models, this pin is tied to
ground (logic low)
The input arrangement of the MT-8870 provides a differential input operational amplifier as well as a bias
source (VREF) to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the op-
amp output (GS) for gain adjustment.
X. GSM/CDMA Network based OPERATION:
Digital Door Lock security system can be operated in two ways. One is by using matrix keypad and
another one is by using GSM/CDMA network. A DTMF circuit is employed which is connected to a mobile
phone as a receiving device. For different keys of the mobile or telephone DTMF decoder decodes multiple
frequencies which will be further used to control the household or Industrial Appliance. A program is written for
PIC16F628A microcontroller which specify the ON and OFF state of the switches. The microcontroller program
is loaded in the PIC16F628A microcontroller using a loader. An IPS circuit can be used for giving back up in
case of power failure.
And our mobile or telephone is the transmitting device of this experiment. The program for the
microcontroller is so designed that when we make a call from our transmitting device, it would be received by
decoder circuit and it will offer a pass code barrier for security purposes. After verifying the pass code it will
give the access to operate the circuit.
XI. Conclusion And Further Recommendations
This paper presents one solution for user friendly, easily maintained, lower power consumption, less
expensive remote door lock system. The system is based on matrix keypad and GSM/CDMA technology. In this
project we have used a new technology incoming number verification system for controlling and security
system. We used a desired mobile number without verification which does not allow the door to be opened.
Some technologies are commercially available which allow remote home appliance controlling through internet
which is undoubtedly emerging. But it lacks the true sense of real mobility. In search of a true remote and
adequately secure solution to be really effective and realizable, mobile telephony is better than any other
solutions. Of late, the system can also be the combination of hardware and software and Artificial intelligence
based Door lock security system design on the future development needs. The system also can be used in
hospitals, libraries, parks and museums, such as urgent security and remote observation of the site for the
protection purpose from threat of damage and destruction.
References
[1] Syam Krishna, J. Ravindra, Design and Implementation of Remote Home Security System Based on WSNS and G SM Technology,
IJESAT, Vol. 2, Special issue-1,PP.139-142, January-February, 2012.
[2] Design and Implementation of Pyroelectric Infrared Sensor Based Security System Using Microcontroller, Proceeding of the 2011
IEEE Students‟ Technology Symposium 14-16 January, 2011, IIT Kharagpur.
[3] Automated advanced industrial and home security using GSM and FPGA, Department of Electronics and Communication Engineering
BV.CEngineering college, Odalarevu, Amalapuram,India.
[4] AT Commands Set for Nokia GSM and WCDMA products, version 1.2, July 2005, available.
[5] Ren Fengyuan, Huang Haining, Lin Chuang, “Wireless sensor network”, Journal of Software Vol. 14, No. 7, PP.1282-1291, March,
2003 (in Chinese).
[6] http://www.scribd.com/doc/27053839/activating-an-electrical-device-via-dtmf-telephone
[7] http://www.quasarelectronics.com/3075-pic-microcontroller-traine-with-5-function.htm
[8] http://www.electro-tech-online.com/microcontrollers/18814-dtmf-tone-pic16f84.html
[9] http://www.embedds.com/-software-based-dtmf-remote-control
[10] http://www.electronics-lab.com/blog/?=microcontroller&paged=43
[11] http://electrofriends.com/projects/basis-electronics/device-control-using-telephone
www.iosrjournals.org 42 | Page