International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
MODELING & DESIGN OF DTMF TECHNIQUE BASED AUTOMATIC MOBILE SWITCHING & CONTROL OF ANY MACHINERY SHARAD CHANDRA RAJPOOT 1, PRASHANT SINGH RAJPOOT 2, SANJAY KUMAR SINGHAI 3, KRISHNA KUMAR SAXENA 4
Assistant professor (EE) G.E.C. Jagdalpur , Bastar, Chhattisgarh, Assistant professor (EE) L.C.I.T., Bilaspur, Chhattisgarh, India, 3 Professor (EE) G.E.C. Bilaspur, Chhattisgarh, India, 4 Associate professor(EE) G.E.C. Bilaspur, Chhattisgarh, India -----------------------------------------------------------------------------------------------------------------------------------------------------------------Abstract- The main scope of project is to send commands bridge rectifier is used to convert ac voltage in to dc value , from one cell phone to be received by another cell phone then this mounted on the kit to receive the DTMF (Dual Tone Multi 12 volt dc value fed in to voltage regulator which operates at Frequency) mode commands which are then decoded. The 12volt dc which converts unregulated dc value in to corresponding codes are then fed to a microcontroller, regulated dc value. Voltage regulator is also used here to programmed to recognize those codes to operate a relay as make good performance of transistors and ics what here per the sent commands from sender’s mobile and connected used. Now a cell phone is connect with the circuit, when device will operated. caller make call on that cell phone ) ICs to generate DTMF The aim of the proposed system is to develop a corresponding to a number or code in the number pad and to detect the same number or code from its corresponding cost effective solution that will provide controlling of devices DTMF. In detail, a DTMF generator generates two such as industrial devices, home appliances remotely and frequencies corresponding to a number or code in the enable home security against intrusion in the absence of number pad which will be transmitted through the homeowner. The system provides availability due to communication networks, constituting the transmitter development of a low cost system. The home appliances section which is simply equivalent to a mobile set. In the control system with an affordable cost was thought to be receiver part, the DTMF detector IC, for example IC MT 8870 detects the number or code represented by DTMF back, built that should be mobile providing remote access to the through the inspection of the two transmitted frequencies. appliances and allowing home security. Now that frequency generated is fed in to microcontroller then transmit to relays after receiving necessary operating Index Terms- DTMF (Dual Tone Multi Frequency), control voltage relay starts switching on and off process of devices. system, home security, ICs. 1
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2.2 EMBEDDED SYSTEM
1. INTRODUCTION1 1.1 OVERVIEW
2.2.1 Introduction
In this system, we are going to develop a cellular phone based home/office appliance. This system is designed for controlling arbitrary devices, it includes a cell phone (not included with the system kit, end user has to connect his/her cell phone to the system) which is connect to the system via head set. To active the cellular phone unit on the system a call is to be made and as the call is answered , in response the user would enter a two/three digit password to access the system to control devices. As the caller press the specific password , it results in turning on or off specific devices. The device switching .[2]
An Embedded System is a combination of computer hardware and software, and perhaps additional mechanical or other parts, designed to perform a specific function. An embedded system is a microcontroller-based, software driven, reliable, real-time control system, autonomous, or human or network interactive, operating on diverse physical variables and in diverse environments and sold into a competitive and cost conscious market.[5]
2. METHODOLOGY 2.1 Working Principle Power supply of 230 volt is fed in to the transformer which step down that voltage in to 12volt supply. A full wave
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