RF Based Home-Automation

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RAJARSHI RANANJAY SINH INSTITUTE OF MANAGEMENT AND TECHNOLOGY AMETHI (Affiliated to Gautam Buddh Technical University Lucknow) ( 2011 – 2012 )

“ HOME AUTOMATION CONTROL SYSTEM USING RF REMOTE CONTROL” Submitted in partial fulfillment of the requirement for the award of Bachelor of Technology Degree In Electronics and Communication Engineering From Rajarshi Rananjay Sinh Institute of Management and Technology, Amethi (Affiliated to Gautam Buddh Technical University Lucknow)

Under the guidance of Mr. Bhupesh Chandra kushwaha Lecturer (ECE)

Submitted by Shalok Singh Ajay Maurya LalAdityaVikramSingh Siddharth Tripathi ECE 4th Year

RAJARSHI RANANJAY SINH INSTITUTE OF MANAGEMENT AND TECHNOLOGY AMETHI (Affiliated to Gautam Buddh Technical University Lucknow) ( 2011 – 2012 )

CERTIFICATE This is to certify that this Project Report

“HOME AUTOMATION CONTROL SYSTEM USING RF REMOTE CONTROL ” Is a bonafide record of the work done by Shalok Singh (0838331023),Lal Aditya Vikram Singh (0838331014), Siddharth Tripathi(0838331025),Ajay Maurya(0838331402) In partial fulfillment of requirement for the award of Bachelor of Technology degree in Electronics and Communication Engineering from Rajarshi Rananjay Sinh Institute of Management and Technology, Amethi.

Mr. Bhupesh Chandra Kushwaha

HOD

Lecturer

(ECE)

(ECE) Mrs. Kirti Jain

ACKNOWLEDGEMENT

At the outset, we would like to take this opportunity to express our gratitude and thanks to various people for their help during the period we were preparing the project.

We deeply express our heartful thanks to Miss Neha Shabbir, Project guide and Lecturer of Electronics and Communication Engineering, for his valuable technical suggestions, much needed guidance and constant encouragement, without which this project would not have come into existence.

We would also like to thank our friends for their help in obtaining the documents related to the project.

We also acknowledge our respected Director for providing technical journals and reference materials in the library, which helped to make our project work accurate.

Shalok Singh (0838331023) Siddharth Tripathi(0838331025) LalAditya Vikram Singh(0838331014) Ajay Maurya(0838331402)

CONTENTS 1. Chapter 1 a. Overview 2. Chapter 2 a. Introduction b. Block Diagram c. Circuit diagram 3. Chapter3 Program used in Project 4. Chapter4 a) Component Description b) Scope c) Use of Project d) Limitation 5. Chapter5 a. Conclusion b. Bibliography

MOTIVATION AND PROPOSAL:

The simple is just to make life easier. We invented TV remote controls so we didn't have to get out of the chair to change the channel. Some people now own complex media systems that require the owner to press 10 different buttons on 5 remotes just to watch Oprah.

Press one button on a remote control and have it dim the lights, set the volume level, and start playing a movie and music which you desire. Not have the sprinklers turn on if it just rained. Get emails sent to you at work or on your cell phone if a motion detector or security system is tripped while out of the house. Get emails sent to you with the caller ID information of a call received at your house when out. Automatically turn the lights on in the house when the garage door goes up and it's after sundown. Automatically turn the front porch lights on 1/2 hour before sundown every day (and automatically adjust for daylight savings). Automatically close the garage doors every night. Automatically turn on holiday lights at specific times (all at once). The full list is limited to imagination and a family's lifestyle.

CHAPTER - 1

OVERVIEW It is one of real time applications in industry now a days all electrical devices in Industry controlled by manually, But in industry so many electrical devices is there. To control all electrical devices we need lot of “ MAN POWER “ if manpower increases Maintenance cost also increases; this is one of the drawbacks of industry, So to avoid such type of drawback we should need some WIRELESS controlling systems, One of wireless communication system is RF (Radio frequency) communication system, it is very cheap and very easy to implement, That is why we have selected RF- COMM, This is not only used in industry but also used in Domestic Purpose as

home appliances controlling using RF remote, some persons who are unable to walk to switch board such type of persons need this type of project and also Who are old persons, why because you can switch ON/OFF load with remote, without moving away from your place, We can control all loads at a time from one place(control room) without connecting any physical wire between loads and control room, In this project we are using RF transmitter, RF receiver, 89c82 microcontroller, BT136 Triac and some discrete components, In this project we have two main sections one is transmitter and Receiver let us explain about transmitter (TX) , TX contain one RF Tx , HT640 (encoder) and 8 ON/OFF switches, when we are press one switch, the data from switch taken by encoder(HT640) which is given to Tx , the Tx simple transmitter it at RF frequency range(433MHz), At receiver side we are receiving data from Tx which is given to decoder (HT 648L) the decoder decodes the data which has received from RF receiver, the decoded data is given to MIC (89c52), Inside MIC there is a S/W Program according to that program, your 89c52 controls all electrical loads In

this project there is no need any physical conductor between Tx and Rx. In this project we should notes one think that is AC loads should not directly connected to microcontroller however AC may be entire into controller due to this your controller may be destroyed, To avoid such type of drawback we need some drivers, In this project we are using TRAIC as load controller (as a switch) so we need TRAIC drivers. We have so many Traic drivers one of them is MOC 3021 used as a Traic driver in between Microcontroller to AC loads,

CHAPTER – 2

INTRODUCTION -

In this project we have Seven Electrical loads (bulb, AC, motors, heaters, and power controlling systems) in that SIX on/off loads and ONE variable load (SPEED CONTROL or current controlling) in variable load we can vary the load up to 7 steps (either INC or DEC) and also you can control the current though load, In Industry we have different types of loads at different locations We can control all loads at a time from one place(control room) without connecting any physical wire between loads and control room, In this project we are using RF transmitter, RF receiver, 89c82 microcontroller, BT136 Triac and some discrete components, In this project we have two main sections one is transmitter and Receiver let us explain about transmitter (TX) , TX contain one RF Tx , HT640 (encoder) and 8 ON/OFF switches, when we are press one switch, the data from switch taken by encoder(HT640) which is given to Tx , the Tx

simple transmitter range(433MHz),

it

at

RF

frequency

CIRCUIT DIAGRAM –

HT640 and HT648L 8 channel Encoder Decoder IC's for RF Modules

CHAPTER – 3

how to use the TWS-434 RF transmitter, and RWS-434 RF receiver with the BASIC Stamp -- for a quick & simple RF communications project

This article shows how to use the TWS-434 RF transmitter, and RWS-434 RF receiver with the BASIC Stamp -- for a quick & simple RF communications project. Note: This is a simple project, and can easily be expanded to transmit temperature data, alarm status, remote control signals, and other information over wireless links between several BASIC Stamps. Once you have your BASIC Stamps communicating over this inexpensive wireless link, the possibilities are virtually endless.....!

Figure 1: BS1-IC Pin Diagram. The BS1-IC or BASIC Stamp I (Rev.B) was chosen for the transmitter circuit due to it's small size. This version of the BASIC Stamp is also relatively inexpensive -- and dedicating it to our transmitter section keeps the overall project cost down. Figure 1 shows the BS1-IC pin descriptions for reference during the remainder of this article. The TWS-434 & RWS-434 RF modules have become extremely popular, and many visitors/customers have asked us to post a project showing how to use these inexpensive RF modules with the BASIC Stamp. This article will help you get started, and provide the basic information you'll need to establish an effective RF communications

network using the BASIC Stamp with the TWS/RWS RF modules.

Figure 2: BS1-IC & TWS-434 Connections. Connect Pin# 7 (P0) of the BS1-IC to the data-input pin of the TWS434 RF transmitter module. Pin# 4 of the TWS-434 is the antenna connection, and requires only a 13-inch piece of insulated hobby wire for an effective antenna. For maximum range, use an antenna that matches the frequency of the transmitter, and provides a 50-ohm load for the transmitter output. This provides maximum RF energy transfer, and will let you reach the maximum operating distance. Under favorable conditions -- the TWS-434 will work up to 400'. This project works exceptionally well at 100'. We didn't bother to test it further -- since previous tests have shown these RF modules operate at well over 300' with matching 50-ohm antennas. Using the SEROUT command: The SEROUT command is used to send data to the transmitter input

The HT640 Encoder ICs are series of CMOS LSIs for Remote Control system applications. They are capable of Encoding 18 bit of information which consists of N address bits and 18-N data bits. Each address/data input is externally trinary programmable if bonded out. The HT648L ICs are series of CMOS LSIs for remote control system applications. This ICs are paired with each other. For proper operation a pair of encoder/decoder with the same number of address and data format should be selected. The Decoder receive the serial address and data from its corresponding decoder, transmitted by a carrier using an RF transmission medium and gives output to the output pins after processing the data. Features Encoder  24 PIN DIP  Operating Voltage : 2.4V ~ 12V  Low Power and High Noice Immunity CMOS Technology  Low Standby Current and Minimum Transmission Word  Built-in Oscillator needs only 5% Resistor

 Easy Interface with and RF or an Infrared transmission medium  Miniml External Comonents Decoder  24 PIN DIP, Operating Voltage : 2.4V ~ 12.0V  Low Power and High Noice Immunity, CMOS Technology  Low Stand by Current, Trinary address setting  Capable of Decoding 18 bits of Information  8 ~ 12 Address Pins and 0 ~ 4 Data Pins  Received Data are checked 2 times, Built in Oscillator needs only 5% resistor  VT goes high during a valid transmission  Easy Interface with an RF of IR transmission medium  Minimal External Components

15Comm-Linking: The basics of RF Communication. When most of us start out with communication, we just cant understand one word from another. Those definitions just take the living heart out of you. Not to mention the complex maths with all the weird symbols, which looks exactly like what we’d read when we read a novel after finishing three bottles of vodka(Assuming, of course, that you are awake that long). So to make things simple to understand and leaving all the mathematics to the guys who make the modules we are going to use, we give you this tutorial. Let us step aside and think about HBO. When you turn on the TV and switch your channel to HBO or star movies or a news channel, what exactly do you think the TV understands by channel? Channel to us simply means the number at which we get HBO or news or what we desire to see. But to the TV that number is actually a address to a particular frequency. You see that black like that come to the back of your TV actually contains all the channels at one time. So when you tell that TV, I want to see HBO it actually allows the signal pertaining to HBO through to

the CRT while all the other signals are blocked out. This is the same concept in the Radio. When you tune to a particular frequency the radio is basically playing only the music that is being transmitted on one particular frequency. This method of transmission is known as FREQUENCY DIVISION MULTIPLEXING. But if we have only one frequency to work on and our data is in Digital format then we can use another method of transmission known as Time division Multiplexing. Now in Time division multiplexing, we basically allow a particular signal transmit at a single frequency for say x no. of seconds. Then we allow a different signal transmission at the same frequency for the same amount of time and the cycle continues. This kind of transmission is much better for us hobbiest because we are, almost all the time, using Digital Data and we generally have only one frequency to transmit on, like 433MHz. Now to do this manually is a pain. We’d have to set up like a dozen different kinds of circuits and ICs for this. But we have a neat trick. There are ICs that does this thing for us and they are called RF Encoder/Decoder ICs. Like the Holtek HT640(Encoder) and HT648L(Decoder).

Let’s start with the HT640 Encoder first. The circuit diagram is given below.

Now, the pin diagram descriptions: 1. D0-D7: 8-bit Data pins. you can use this as a parallel interface(like from a microcontroller) or use them as individual switches(like for controlling 4 motors, remember the “A Input 1″ and “B input 1″ using the L293). 2. DOUT: The DOUT pin is the ‘Digital Output’ pin. This pin 3. is the pin from which the encoder outputs it’s encrypted

4. signal. It should be connected to the DIN/Data-In pin of your TX module. 5. TE: The TE pin is the ‘Transmission Enable’ pin. when you have loaded all the data on your data pins and set the addresses on the address pins, you pull TE high to start the transmission. It can be either clock controlled or button controlled depending on your needs. 0.5s-1s seems to be enough of a pulse with for successful transmission. 6. OSC2-OSC1: These two pins are the internal oscillator pins. You need to connect a resistor between the two pins. The value of the Resistor HAS TO BE SAME FOR ALL RECEIVERS OF THE TRANSMITTER, otherwise information will become out of sync. 7. Vss: Self-explanatory. 8. Pins A0-A9: The ‘A’ Pins are called the Address pins. Imagine you are running multiple receiving devices on the HT648L Decoder IC. But the Remote control transmitter is only one HT640 Encoder IC. How do we make sure that we get only one receiver to respond and not all the receivers listening to the command. For that we have something called Addresses for each receiver. The concept is quite simple. The Binary 10-bit combination has to be same on both the transmitter and receiver for the data to be successfully transmitted. If not, then the receiver will receive the transmissions but because the addresses don’t match it will ignore the signal. so now if my receiver has the 10bit(A0-A9) address of say ’0001110001010′, then for my transmitter to transmit data to that receiver my transmitter must also have the adderss ’0001110001010′. This is awesome considering that I can control 210=1024, 1024 different

receivers from just one transmitter and ON THE SAME FREQUENCY BAND(433MHz in my case). 9. Vdd: +ve 5V supply. Now lets see the HT648L Decoder IC.

Here is the Pin Description: 1. D0-D7: Output pins of the data pins from the transmitter. 2. VT: VT stands for ‘Valid Transmission’. When there is no errors in the transmitted data, VT goes High. 3. DIN: The DIN pin is the ‘Digital INput’ pin. This pin is the pin from which the decoder gets input of it’s encrypted signal that the encoder transmitted. It should be connected to the DOUT/Data-OUT pin of your RX module. 4. OSC2-OSC1: These two pins are the internal oscillator pins. You need to connect a resistor between the two pins. The value of the Resistor HAS TO BE SAME FOR ALL RECEIVERS OF THE TRANSMITTER, otherwise information will become out of sync.

5. Vss: Self-explanatory. 6. Pins A0-A9: The ‘A’ Pins are called the Address pins. Imagine you are running multiple receiving devices on the HT648L Decoder IC. But the Remote control transmitter is only one HT640 Encoder IC. How do we make sure that we get only one receiver to respond and not all the receivers listening to the command. For that we have something called Addresses for each receiver. The concept is quite simple. The Binary 10-bit combination has to be same on both the transmitter and receiver for the data to be successfully transmitted. If not, then the receiver will receive the transmissions but because the addresses don’t match it will ignore the signal. so now if my receiver has the 10bit(A0-A9) address of say ’0001110001010′, then for my transmitter to transmit data to that receiver my transmitter must also have the adderss ’0001110001010′. This is awesome considering that I can control 210=1024, 1024 different receivers from just one transmitter and ON THE SAME FREQUENCY BAND(433MHz in my case).

7. Vdd: +ve 5V supply.

8. BASIC ELECTRONICS COMPONENTS

9. 10. Electronics can at first seem extremely complicated to understand and learn. One look at a circuit board with all those little blinky LED's and black chips and unidentifiable circle pointy things can make anyone quit before starting. 11. But actually electronics can be much simpler than you think. Learning electronics is more like learning a foreign language alphabet. At first glance it is all a bunch of squiggles. But actually each letter has its own pronounciation and its own rules of use. And certain combinations of letters in a certain order form a word of some meaning. And a combination of words forms a sentence. This is the same for a circuit board. Each tiny component, such as a resistor or capacitor or transistor, has special rules and abilities. Combining a few into a

circuit can create interesting effects. Combine a bunch of unrelated circuits together and suddenly you have a robot. So your first step would just to be to learn and understand the smallest of the components. Once there you can learn about combining them. Just like learning a foreign alphabet, no? 12. Ok first a quick crash course in electron physics. All electronics is designed to manipulate a flow of electrons. Electrons have mass and volume so you can almost think of electrons in circuits as water flowing through plumbing. The analogy is amazingly helpful if you think about it. Also note, the more electrons you have in one place, the higher the voltage. The more electrons moving together, the higher the current. The same as with water. 13. POWER Power is simply the energy required to do something. If you are moving a large amount of electrons, and moving them through something that is resistant of that movement, power is used. Power is voltage times current. Power is also voltage squared divided by resistance.

P=I*V P = (V^2)/R 14. Ground and Source Source is the positive part of your circuit. The plus end of your battery would go here. Ground is the negative node of your circuit. When you design your circuit, imagine a flow of electrons coming from the source, and heading to the ground. A quick note, in reality electrons move from gound to source. The confusion has historical reasons I dont want to get in to. But just know this fact, and pretend electrons move from source to ground. 15. Now think of this as water. 16. Water flows down the easiest quickest path between these two points. More resistance to flow, less will flow. 17.

RESISTORS These do exactly what they say. They resist the flow of electrons. These are necessary for several reasons: - they can control how much current goes down each wire - they can control power usage - they can control voltages (since current, resistance, and voltage are interrelated) 18. The last point is important as it is the basis of Ohm's law, V=IR. Voltage = Current x Resistance. For example, suppose you take a resistor and connect the two ends of a battery with it. You know that your battery is 9V (or whatever) and you know the resistor is 3Kohm (determined by the color stripes on the resistor), so 9V divided by 3Kohm is .003amps (3 milliamps). So why is this information useful? Well now that you know the current, you can determine other useful things such as power. P=IV. You will notice that if you increase resistance, you decrease current. If you decrease current, you decrease power use. Put a 1ohm resistor between the battery and it will get so hot it could burn because of the power use. Use a 100Kohm resistor and almost no power at all will be used.

19. So about determining the value of a resistor, all resistors have the value labled on them. You will notice colored stripes on the resistor. Each stripe means a certain number. This has been explained a billion times online already so I won't, just google search 'resistor color tutorial.' Click for a quick resistor color code reference chart. 20.

CAPACITORS Now suppose you want to control how the current in your circuit changes (or not changes) over time. Now why would you? Well radio signals require very fast current changes. Robot motors cause current fluctuations in your circuit which you need to control. What do you do when batteries cannot supply current as fast as you circuit drains them? How do you prevent sudden current spikes that could fry your robot circuitry? The solution to this is capacitors.

Capacitors are somewhat complex in theory, but most people can get by on the basics which I will explain here. Capacitors are like electron storage banks. If your circuit is running low, it will deliver electrons to your circuit. If your circuit is in excess (such as when your robot motors are turned off), it will store electrons. In our water analogy, think of this as a water tank with water always flowing in, but with drainage valves opening and closing. Since capacitors take time to charge, and time to discharge, they can also be used for timing circuits. Timing circuits can be used to generate signals such as PWM or be used to turn on/off motors in solar powered BEAM robots. 21. Quick note, some capacitors are polarized, meaning current can only flow one direction through them. If a capacitor has a lead that is longer than the other, assume the longer lead must always connect to positive. 22. How do capicitors charge over time? This Capacitor Charge Curve Chart should help. The discharge rate would be the direct inverse. Theoretically (as made obvious by the graph) a capacitor can never be fully charged or discharged, but in reality this is never the

case.

23. So how can you use capacitors in your robot? 24. Power surge/drainage management. 25. The problem with using robot components that drain a large amount of power is sometimes your battery cannot handle the high drain rate. Motors and servos being perfect examples. This would cause a system wide voltage drop, often reseting your microcontroller, or at least causing it to not work properly. Just a side note, it is bad to use the same power source for both your control circuitry and your motors. So don't do it. 26. Or suppose your robot motors are not operating at it's full potential because the battery cannot supply enough current, the capacitor will make up for it. The solution is to place a large electrolytic capacitor between the source and ground of your power source. Get a capacitor that is rated at least twice the voltage you

expect to go through it. Have it rated at 1uF-10uF for every amp required. For example, if your 20V motors will use 3 amps, use a 3uF-30uF 50V rated capacitor. Exactly how much will depend on how often you expect your motor to change speed and direction, as well as momentum of what you are actuating. Just note that if your capacitor is too large, it make take a long time to charge up when you first turn your robot on. If it is too small, it will drain of electrons and your circuit will be left with a deficit. It is also bad to allow a large capacitor to remain fully charged when you turn off your robot. Things could accidently short and fry, such as curious kitties that get too close. So use a simple power on LED in your motor circuit to drain the capacitor after your robot is turned off. If your capacitor is not rated properly for voltage, then can explode with smoke. Fortunately they do not overheat if given excessive amounts of current. So just make sure your capacitor is rated higher than your highest expected. 27. Capacitors can also be used to prevent power spikes that could potentially fry circuitry. Next to any on/off switch or anything that that could affect power suddenly should have a capacitor across it.

28. Capacitors can eliminate switch bouncing. When you flip a mechanical switch, the switch actually bounces several times within a microsecond range. Normally this is too small of a time for anyone to care (or even notice), but note that a microcontroller can take hundreds of readings in a single microsecond. So if your robot was counting the number of times a switch is flipped, a single flip can count as dozens. So how do you stop this? Use a small ceramic capacitor! Just experiment until you find the power capacitance value. 29. Capacitors can improve efficiency and longevity of electric motors up to 100%. Place a small ceramic capacitor of like 10uF across the two leads of your motor. This works really well with el-cheap-o motors. Not much effect with high-end expensive motors however. These capacitors will also signficantly reduce EMI (Electro Magnetic Interference) and system noise too. 30.

DIODES Diodes are what you would use to ensure current flows

in only a single direction. A great water analogy to a diode is a dam. Water never flows up a damn. But the analogy goes even further. With diodes, there is always a voltage across it (typically .7V forward voltage). Meaning if you have a diode come after a 7.2V battery, the voltage would then be 6.5V. This is just like a dam in that the water level will always drop. Doesnt current already always flow in only a single direction? No. RC circuits, or circuits involving AC power, or circuits that are noisy (such as with motors), involve currents that changes directions. So why would you only want current to flow in a single direction? Many many reasons. But for a beginner, you need to protect your circuitry from noise. A microcontroller would fry if current went the wrong way. Motor drivers and MOSFETs would too. Diodes are also useful for dropping high voltages to a lower more usable voltage. 31. This below chart represents the current vs voltage curve typical of diodes. As you can see, the current passing through a diode changes non-linearly as voltage changes linearly.

32. 33. There is another special diode called a zener diode. With the water analogy, a zener diode is like a dam, but with a pump at the bottom pumping water back to the top. Zener diodes allow current to flow in reverse as well as forward. The forward voltage is still around .7V, but there is a different reverse voltage of around negative ~2.3V. You will probably never need to use a zener diode.

34.

POWER SUPPLY

INTRODUCTION TO POWER SUPPLY: Power supply is an important part of operation

of

the

microcontroller.

Microcontroller operates at +5V DC and also

for other IC’s and displays. A 220v ac to 12-012v transformer is used and for rectification, two

diodes

IN4007

are

connected

for

rectification of the step down ac supply. Filter capacitor of 1000uF is used. It is regulated to +5V using a regulator 7805. 0.1uF capacitor is used for filtration of high frequency noise. LED is give3n for power on indication.

TRANSFORMER:

Definition: The transformer is a static electromagnetic

device

that

transforms

one

alternating voltage (current) into another voltage (current). However, power remains the

some

Transformers

during play

the a

transformation.

major

role

in

the

transmission and distribution of ac power.

Principle: Transformer works on the principle of mutual induction. A transformer consists of laminated

magnetic

core

forming

the

magnetic frame. Primary and secondary coils are

wound

magnetic

upon

frame,

the linked

two by

cores the

of

the

common

magnetic flux. When an alternating voltage is

applied across the primary coil, a current flows in the primary coil producing magnetic flux in the transformer core. This flux induces voltage in secondary coil. Transformers are classified as: Based on position of the windings with respect to core i.e. Core type transformer 1 a

a

Shell type transformer

Transformation ratio: 1

Step up transformer

2

Step down transformer

Core & shell types: Transformer is simplest electrical

machine,

which

consists

of

windings on the laminated magnetic core. There are two possibilities of putting up the windings on the core.

1

Winding encircle the core in the case of core type transformer

2

Cores encircle the windings on shell type transformer.

b

Step up and Step down: In these Voltage transformation takes place according to whether the Primary is high voltage coil or a low

voltage coil. 1

Lower to higher-> Step up

2

Higher to lower-> Step down

LM7805C: A variable regulated power supply, also called a variable bench power supply, is one where you can continuously adjust the output voltage to your requirements. Varying the output

of

the

power

supply

is

the

recommended way to test a project after having

double

checked

parts

against

circuit

drawings

and

placement the

parts

placement guide. This type of regulation is ideal for having a simple variable bench power supply. Actually this is quite important because one of the first projects a hobbyist should undertake is the construction of a variable regulated power supply. While a dedicated supply is quite handy e.g. 5V or 12V, it's much handier to have a variable supply on hand, especially for testing. Most digital logic circuits and processors need a 5 volt power supply. To use these parts we need to build a regulated 5 volt source. Usually you start with an unregulated power To make a 5 volt power supply, we use a

LM7805

voltage

regulator

IC

(Integrated

Circuit). The LM7805 is simple to use. You simply connect the positive lead of your unregulated DC power supply (anything from 9VDC to 24VDC) to the Input pin, connect the negative lead to the Common pin and then when you turn on the power, you get a 5 volt supply from the Output pin.

CIRCUIT FEATURES

 Brief description of operation: Gives out well regulated +5V output, output current capability of 100 mA  Circuit

protection:

protection

shuts

Built-in down

overheating

output

when

regulator IC gets too hot  Circuit complexity: Very simple and easy to build  Circuit

performance:

Very

stable

+5V

output voltage, reliable operation  Availability of components: Easy to get, uses only very common basic components  Design

testing:

Based

on

datasheet

example circuit, I have used this circuit successfully as part of many electronics projects

 Applications: Part of electronics devices, small laboratory power supply  Power supply voltage: Unregulated DC 818V power supply  Power

supply

current:

Needed

output

current + 5 mA  Component costs: Few dollars for the electronics transformer

components

+

the

input

Applications  Burglar Alarm, Smoke Alarm, Fire Alarm, Car Alarm, Security System  Garage Door and Car Door Controllers  Cordless telephone  Other Remote Control System

Compatibility  Compatible with RF Modules 433 MHz. Link :RF Modules (Tx + Rx Pair) 433 Mhz ASK

Controlled Devices

The

following

devices

microcontroller:  Fan  Light  Digital thermostat Controlled Devices - Fan

will

be

controlled

by

the

Controlled Devices – Light

STK300 port B, bit 0

STK300 port B bit 1

Control relay Manual/Remote select Power from 120VAC outlet

Light Switch

IMPACT ON HOME APPLIENCE&INDUSTRY:

This project will have a huge impact on academics and industry. With the help of this project we have tried to depict the modern & global application of cell phone. Mobile phone for home automation control can overcome these limitations and provides the advantage of home applience control,

working range as large as the coverage area of the service provider, no interference with other controllers. This project is very useful on the home usage of cell phone or DTMF controlled home applience .The home applience are controlled by the cell phone . The industry can find major application of this project in developing mobile operated products as commercial projects.

ADVANTAGES:

1. This circuit helps in controlling the home appliances from a remote place. 2. One circuit can control up to eight different appliances directly and further the equipment can be grouped using a multiplexer, several

other devices can

be controlled. Cost involved for making and operating the circuit is

minimum. 3. Low power requirement and maintenance cost is zero.

CONCLUSION-

 Functioning in a team environment  Should follow assignment criteria closely  Amount of detailed documents goes in a professional project

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