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                                            CONTROL OF ELECTRICAL APPLIANCES THROUGH MOBILE

 

INTRODUCTION

 

PLC based device controls

In the both electronics and electrical field, have a great value of PLC. In the normal daily life we are using PLC technique for automatically ON and OFF devices. This all will be depend upon our programming. We can use this PLC technique at various places like in textiles industries, machinery industries extra. We are take the some examples of our some most commonly industries like JCT MILLS, VARDHMAN MILLS etc. we are using the +5volt input supply at the input side. We can give the input signal in the high signal form and in the low signal form.

In this project we can control any electrical appliances through mobile or landline from any part of the country.  In this project one base unit is connected to the basic landline in parallel with the land line phone.. When we want to control any electrical appliances through outer phone then first we  dial the home number, bell is ringing and after few bell phone is automatic on and switch on the base unit  to operate. Now we press the single digital excess code, if the excess code is ok then unit give a  tone pulse and switch on the base unit. Now again we press the switch on/off code to on/off any electrical appliances. With the help of this code unit is on and base unit give a acknowledge pulse for on and off separately.

On rxer side detector will detect the signal then it will transfer the signal to special amplifier then the signal will be input for speaker. We will use DPDT switch for selecting voice and data signal

In data transmission we will transfer the data using DTMF technology. DTMF is dual tone multi frequency technology. In this we will use dtmf encoder with keyboard for data generation purpose. On the receiver side we will use dtmf decoder IC 8870 for it. Output of it will be the input od seven segment display driver IC. Output of Seven segment decoder IC will be the input of Seven segment display. We will common anode seven segment display. Seven will show the no entered with kryboard. When we will give signal on mic then speaker will give voice signal output. We will make +5v power supply for encoder & decoder ICs & +9v for amplifier circuits.  In this project will study about voice and data transmission.

 

PIN DESCRIPTION

 

IC 74154 is a BCD to Decimal converter. This IC is a 24 pin IC. Pin no.20,21, 22,23 are the BCD input pins of this IC,pin no. 2,3,4,5,6,7,8,9,10,11, are the output pins, pin no.24 is connected to the positive 5 volt supply  and pin no.12 is the negative supply pin. Pin no. 18 and pin no. 19 of this IC is enable pin. If the data available on the pin no. 19 is negative then output is negative for a time. The negative pulse is given by the NPN transistor collector point. IC 74154 is a special package may be used to provide a 1 low output out of 16 outputs or may be used to send input data to one selected output of 16, the remaining 15 staying high.                                                  3                         3                                                                                    14

PIN DESCRIPTION

IC 4049 is a hex inverter IC. Pin no. is connected to the positive supply. Pin no. 7 is connected to negative supply. Pin no. 3,5,7,9,11 are the inputs of the IC and pin no. 2,4,6,10,12 are the input pins of this IC. Since the output of IC 74154 are low hence IC 4049 is used to invert the output of IC 74154, ie ,  to convert the low output of the decoder IC into high output . Substitute IC:  7404

 IC 8870      

 

 

COMPONENTS REQUIRED

 

DTMF DECODER CM8870

DECODER IC 74LS154

IC 4049

RELAYS- 180 OHM 12V

RESISTANCES- 100OHM,22K,220K,330K

CAPACITORS- 1000F,470F,33PF,1F

TRANSFORMER 12 V

REGULATOR- 7805

TIMER NE555

DECADE  COUNTER IC 4017

ELECTRICAL SWITCHES

PLYBOARD

COPPER CLAD BOARD

FECL3

SOFTWARE REQUIRED

UMPS COMPILER,ORCAD, PROGRAMMER

 

 

 

 

 

 

 

Applications:-

 

            Networking between Computers.

            Because of large bandwidth used for telephone,tv network & internet comm..

            Communication between Buildings

            For sensing purpose- its use as a senser

            For Security purposes- To protect house or lockers

            For Military equipments- Because its a secure data transmission syatem

            For Medical machines- used as a sensing device

            For lightening purpose in decoration

 

Bibliography:

 

www.optoprojects.com/optical.doc

 

www.electrooptical.com/sensor.pdf

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