1. LINGAYAS UNIVERSITY
Electronics & Communication Engineering
Major project presentation

2. RF BASED HOME AUTOMATION
SYSTEM
 Team 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

3. INTRODUCTION
Home 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.

4. 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.

5. 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.

6.  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.

7. Features
 Low power consumption.
 Easy for application.
 Operation temperature range : ﹣20℃～＋70℃
 Operation voltage: 5 Volts.
 Available frequency at: 315/434 MHz
 Range up to 25mtrs.

8. 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

9. 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.

10. Working

11.  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.

12.  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.

13.  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.

14. Encoder Encoder 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.

15. Decoder
 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.
 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.

16. RF Transmitter & Receiver

17. Transmitter working
 .

18. RF transmitter Pin description
Pin
No
Function Name
1 Ground (0V) Ground
2 Serial data input pin Data
3 Supply voltage; 5V Vcc
4 Antenna output pin ANT

19. Transmitter circuit

21. Receiver working.

22. RF Receiver Pin description
Pin
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

23. Reciever IC

24. Reciever IC working

25. Receiver circuit

27. Applications
 Burglar Alarm, Smoke Alarm, Fire
Alarm, Car Alarm, Security System
 Garage Door and Car Door Controllers
 Cordless telephone
 Other Remote Control System
 Wireless security systems
 Car Alarm systems
 Remote controls.
 Sensor reporting