Rf Based Home Automation System Without any controller.

1. RF Based Home automation
System
By,
Manu D
Manu K

2. Introduction
 RF based Home Automation System
 As the technologies are rapidly advancing that affects the human daily
lives more flexible, particularly in controlling home appliances.
Electrical installations are the heart of every building, therefore
intelligent building control absolutely ensures the safety and efficient
control and eventually saves the electric power consumption and
human energy.
 Home automation system does the operations like lighting control and
regulation, regulating HVAC (Heating, Ventilation and Air
Conditioning) equipment’s, energy and load management, security
and monitoring, audio/ video systems, HMI’s and other control tasks.

3. Functional Description:
 Presently, conventional wall switches located in different parts of the
house makes it difficult for the user to go near them to operate.
 In order to achieve this, a RF remote is Transfer a signal which sends
ON/OFF commands to the receiver where loads are connected.
 By operating the specified remote switch on the transmitter, the loads
can be turned ON/OFF remotely through wireless technology. 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.

4. Block Diagram
Relay
Circuit OUTPUT

5. Components Required
 RF Transmitter
 RF Receiver
 Ic HT12d
 IC HT12e
 Resistor 750k -2
 Resistor 33k -2
 Resistor 1k -8
 Transistor BC547 – 8
 IC socket 18 pin-4
 3 pin switch
 Relay – 8
 PCB 2
 LED 2
 Power Supply 12v
 Ic 7408(Regulator)
 Connecting Wires with Soldering Kit

6. Features
Range in open space(Standard Conditions) : 100 Meters
RX Receiver Frequency : 433 MHz
RX Typical Sensitivity : 105 Dbm
RX Supply Current : 3.5 mA
RX IF Frequency : 1MHz
Low Power Consumption
Easy For Application
RX Operating Voltage : 5V
TX Frequency Range : 433.92 MHz
TX Supply Voltage : 3V ~ 6V
TX Out Put Power : 4 ~ 12 Dbm
RF Transmitter and Receiver

7. Encoder ic pin mode
Pin
No
Function Name
1
8 bit Address pins for input
A0
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8 A7
9 Ground (0V) Ground
10
4 bit Data/Address pins for
input
AD0
11 AD1
12 AD2
13 AD3
14
Transmission enable; active
low
TE
15 Oscillator input Osc2
16 Oscillator output Osc1
17 Serial data output Output
18
Supply voltage; 5V (2.4V-
12V)
Vcc

8. Decoder IC pin mode

9. Relay (5v 5A)

10. Applications
 Light Control
 Fan Control
 Electrical Equipment Control
 RF car control
 Etc..