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GSM GATE OPENER WITH PASSWORD

 

 

MICROCONTROLLER BASED MOBILE

IRRIGATION CONTROL

 

INTRODUCTION &WORKING:-

In this project we will make GSM gate opener we will control GATE. We will use DC geared motors. We are adding  password for security purpose. In this project we can control any electrical MOTOR 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 motor through outer phone then first we  dial the connected mobile no., 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 motor. With the help of this code unit is on and base unit give a acknowledge pulse for on and off separately. in this project we can control number motors and different electrical functions through mobile.

 

 

DTMF DECODER.

In dtmf decoder circuit we use ic 8870 ic. IC 8870 is a dtmf decoder ic. IC 8870  converts the dual tones to corresponding binary outputs.

 

DTMF SIGNALLING.    Ac register signaling is used in dtmf telephones, here tones rather than make/break pulse are used fro dialing, each dialed digit is uniquely represented by a pair of sine waves tones. These tones ( one from low group for row and another from high group fro column) are sent to the exchange when a digit is dialed by pushing the key, these tone lies within the speech band of 300 to 3400 hz, and are chosen so as to minimize the possibility of any valid frequency pair existing in normal speech simultaneously. Actually, this minimisator is made possible by forming pairs with one tone from the higher group and the other from the lower of frequencies. A valid dtmf signal is the sum of two tones, one from a lower  group ( 697-940 Hz) and the other from a a higher group ( 1209-1663 Hz). Each group contains four individual tones.  This scheme allows 10 unique combinations. Ten of these code represent digits 1  through 9 and 0. . tones in DTMF dialing  are so chose that none of the tones is harmonic of  are other tone. Therefore  is no change of distortion caused by harmonics. Each tone is sent as along as the key remains pressed. The dtmf signal contains only one component from each  of the high and low group. This significaly simplifies decoding because the composite dtmf signal may be separated with band pass filters into single frequency components, each of which may be handled individually.

WELCOME TO THE WORLD OF THE MICROCONTROLLERS.

 

Look around. Notice the smart “intelligent” systems? Be it the T.V, washing machines, video games, telephones, automobiles, aero planes, power systems, or any application having a LED or a LCD as a user interface, the control is likely to be in the hands of a micro controller!

Measure and control, that’s where the micro controller is at its best.

Micro controllers are here to stay. Going by the current trend, it is obvious that micro controllers will be playing bigger and bigger roles in the different activities of our lives.

So where does this scenario leave us? Think about it……

The world of Micro controllers

What is the primary difference between a microprocessor and a micro controller? Unlike the microprocessor, the micro controller can be considered to be a true “Computer on a chip”.

In addition to the various features like the ALU, PC, SP and registers found on a microprocessor, the micro controller also incorporates features like the ROM, RAM, Ports, timers, clock circuits, counters, reset functions etc.

While the microprocessor is more a general-purpose device, used for read, write and calculations on data, the micro controller, in addition to the above functions also controls the environment.

We have used a whole lot of technical terms already! Don’t get worried about the meanings at this point. We shall understand these terms as we proceed further
large amount of built in ROM and RAM. In addition it has the ability to access external memory
Obviously you would

COMPONENTS REQUIRED

MICROCONTROLLER 89C051

DTMF DECODER CM8870

DECODER IC 74LS154

IC 4049

RELAYS- 180 OHM 12V

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

CAPACITORS- 1000µF,470µF,33PF,1µF

TRANSFORMER 12 V

REGULATOR- 7805

TIMER NE555

DECADE  COUNTER IC 4017

ELECTRICAL SWITCHES

PLYBOARD

COPPER CLAD BOARD

FECL3

SOFTWARE REQUIRED

UMPS COMPILER,ORCAD, PROGRAMMER

PLANNING

STEPS

TIME

RESPONSIBILTY

PROJECTS SELECTION

 

 

CIRCUIT AND THEORY ARRANGEMENT

 

 

CHECKING AVAILABILITY OF COMPONENTS

 

 

TESTING CIRCUIT

 

 

PCB DESIGN

 

 

COMPONENT INSERTION AND SOLDERING

 

 

TESTING

 

 

REWORK  OR TROOUBLE SHOOTING

 

 

 

Advantage and applications:

1.     farmers have to go to fields to start pump motor early in the morning. With the help of this project they can easily control the pump. At any time.

2.     In some areas because of lack of water sources, water supply is for very small time. With the help of this project employees doing job can switch on/off their house’s water tank motor.

3.     motors in remote  area can be control

4.     Antenna direction can be easily controlled

5.     Robotics.

Bibliography:

 

www.mcuprojects.com

www.cornoluniversity/ece/mobile.html

www.ludhianaprojets.com