LINGAYAS UNIVERSITY

Electronics & Communication Engineering

Major project presentation

RF BASED HOME AUTOMATION SYSTEMTeam members :

Ankit Kumar Gosain(09-EC-028)Ankit Sehrawat (09-EC-029)Atul Sharma(09-EC-042)Bhupinder Singh(09-EC-048)

Project Coordinator:

Mr. KK Sharma

INTRODUCTIONHome Automation System using RF

The main aim of the home automation system is to make our lives easier for example we invented TV remote controls so we didn't have to get out of the chair to change the channel.

The main aim of our efforts are to create a techno home in which we just have to 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.

BASIC CONCEPTIn this project we show that how we control electrical

appliances with the help of WIRELESS REMOTE(Radio Frequency Module).

As we press the switch from transmitter end then immediate data is to be transmitting in the air. Data receive in air by the Radio frequency module and proceed to the electrical appliances circuit.

In this project we use two circuits one is transmitter and second is receiver.

In the transmitter part we send the rf code by the transmitter by 4 switch’s and in the receiver we use four relay coil for electrical output.

As we want to switch on any electrical appliances we press the switch of the transmitter.

As the switch is pressed, data is to be transmitting by the radio frequency module.

In this project we use 433 Mhz modules for data transmission.

We use one encoder ic for data transmission. All the switches are connected to the encoder. Encoder ic get

the data from the switch and transmit the data in serial by the RF transmitter.

In the receiver circuit we use RF module to get the data and decoded by the decoder. Decoder deliver the data into 4 bit and we

use further control circuit to switch on/off.

FeaturesLow power consumption.Easy for application.Operation temperature range : 20℃﹣ ～＋

70℃Operation voltage: 5 Volts.Available frequency at: 315/434 MHzRange up to 25mtrs.

Components used  

7805 Voltage Regulator HT12 E ENCODER IC. HT12 D DECODER IC. RF TRANSMITTER MODULE. RF RECEIVER MODULE 4 DIFFERENT SWITCH 4013 ( D flip flop) 4049 ( hex inverter) Radio Frequency Receiver Module 433 MHz Transistors Resistance Capacitors Relays IN 4007 Diodes LEDs Transformer

FUNCTIONAL DESCRIPTION:This circuit utilizes the RF module (Tx/Rx) for making

a wireless remote, which could be used to drive an output from a distant place.

RF module, as the name suggests, uses radio frequency to send signals.

These signals are transmitted at a particular frequency and a baud rate.

A receiver can receive these signals only if it is configured for that frequency.

Working

The input signals, at the transmitter side, are taken through four switches while the outputs are monitored on a set of four LEDs corresponding to each input switch.

The outputs from the receiver can drive corresponding relays connected to any household appliance.

This radio frequency (RF) transmission system employs Amplitude Shift Keying (ASK) with transmitter/receiver (Tx/Rx) pair operating at 434 MHz.

The transmitter module takes serial input and transmits these signals through RF.

The transmitted signals are received by the receiver module placed away from the source of transmission.

The system allows one way communication between two nodes, namely, transmission and reception.

In every card we use one encoder ic with digital data base, this digital data base may be 16 bit or 32 bit. In this project we use 4 bit data base to show the basic concept of this project Easily available encoder and decoder’s are HT12 E and HT 12D. HT12 E is encoder ic and HT 12D is decoder ic We use 18 pin version of encoder and decoder ic.

The RF module has been used in conjunction with a set of four channel encoder/decoder ICs. Here HT12E & HT12D have been used as encoder and decoder respectively.

EncoderEncoder IC (HT12E) receives parallel data in the form of address bits and control bits.

The control signals from remote switches along with 8 address bits constitute a set of 12 parallel signals.

The encoder converts the parallel inputs (from the remote switches) into serial set of signals. These signals are serially transferred through RF to the reception point.

Transmission is enabled by providing ground to pin14 which is active low.

DecoderIn the receiver circuit we use RF module to

get the data and decoded by the decoder. Decoder deliver the data into 4 bit and we use further control circuit to switch on/off.

The decoder is used after the RF receiver to decode the serial format and retrieve the original signals as outputs. These outputs can be observed on corresponding LEDs.

RF Transmitter & Receiver

Transmitter working

.

RF transmitter Pin descriptionPin No Function Name

1 Ground (0V) Ground

2 Serial data input pin Data

3 Supply voltage; 5V Vcc

4 Antenna output pin ANT

Transmitter circuit

Receiver working.

RF Receiver Pin descriptionPin No Function Name

1 Ground (0V) Ground

2 Serial data output pin Data

3 Linear output pin; not connected NC

4 Supply voltage; 5V Vcc

5 Supply voltage; 5V Vcc

6 Ground (0V) Ground

7 Ground (0V) Ground

8 Antenna input pin ANT

Reciever IC

Reciever IC working

Receiver circuit

Applications

Burglar Alarm, Smoke Alarm, Fire Alarm, Car Alarm, Security System

Garage Door and Car Door ControllersCordless telephoneOther Remote Control SystemWireless security systemsCar Alarm systemsRemote controls.Sensor reporting