1. Project Title
ARDUINO BASED WIRELESS ELECTRICAL APPARATUS CONTROL SYSTEM USING IR COMMUNICATION
Under the Guidance of
Submitted by

2. ABSTRACT
The project is designed to operate electrical loads using a IR operated TV remote.
The system operates electrical loads depending on the data transmitted from the TV remote
This is traditionally RC5 code as followed by remotes from PHILIPS.
The same data is then burnt to a microcontroller to drive desired output load through relays or opto isolators and triacs.
All the buttons of the remote can be used for as much number of loads to be operated.
All the above functions are monitored and controlled by the 8 bit Arduino.

3. 3. PROJECT BLOCK DIAGRAM

4. HARDWARE REQUIREMENT POWER SUPPLY BLOCK ARDUINO RC5 CODE PUSHBUTTON
RELAY
ULN 2003
TSOP
1N4007
LED
RESISTORS
CAPACITORS

5. POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC
Filter(470µf)
12V step down
transformer

6. ARDUINO
The Arduino microcontroller is an easy to use yet powerful single board computer that has gained considerable traction in the hobby and professional market.
The Arduino is open-source, which means hardware is reasonably priced and development software is free.

7. Image of development board

8. Features of Duemalinove
The Duemalinove board features an Atmel ATmega328 microcontroller operating at 5 V with 2 Kb of RAM, 32 Kb of flash memory for storing programs and 1 Kb of EEPROM for storing parameters.
The clock speed is 16 MHz, which translates to about executing about 300,000 lines of C source code per second

9. …..contd
The Arduino programming language is a simplified version of C/C++. If you know C, programming the Arduino will be familiar.
If you do not know C, no need to worry as only a few commands are needed to perform useful functions.

10. RC5 CODE
A common used standard protocol for infrared data communication is the RC5 code, originally developed by Phillips.
This code has an instruction set of 2048 different instructions and is divided into 32 address so this makes it possible to change the volume of the TV without change the volume of the hifi
The transmitted code is a data word which consists of 14 bits and is defined as:
2 start bits for the automatic gain control in the infrared receiver.
1 toggle bit (change every time when a new button is pressed on the ir transmitter
5 address bits for the system address
6 instruction bits for the pressed key

11. TSOP1738 Features:- Photo detector and preamplifier in one package
Internal filter for PCM frequency
Improved shielding against electrical field disturbance
TTL and CMOS compatibility
Output active low
Low power consumption
High immunity against ambient light
Continuous data transmission possible (up to 2400 bps)
Suitable burst length .10 cycles/burst

12. Description:-
The TSOP17 – series are miniaturized receivers for infrared remote control systems.
PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter.
The demodulated output signal can directly be decoded by a microcontroller.
TSOP1738 is the standard IR remote control receiver series, supporting all major transmission codes.

13. RELAY IT IS A ELECTRO MAGNETIC SWITCH
USED TO CONTROL THE ELECTRICAL DEVICES
COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

14. The relay's switch connections are usually labeled COM, NC and NO:
COM = Common, always connect to this; it is the moving part of the itch.
NC = Normally Closed, COM is connected to this when the relay coil is off.
NO = Normally Open, COM is connected to this when the relay coil is on

15. RELAY DRIVER (ULN 2003)
ULN2003 is a high voltage and high current Darlington transistor array
It consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode Clamp diode for switching inductive loads.
The ULN2003 has a 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices.
Current, Output Max:500mA
Voltage, Input Max:5V
Voltage, Output Max:50V

16. Fig: ULN 2003

17. WORKING OF PROJECT
The project uses an IR receiver such a TSOP-1738 that responds to only specific frequency of 38 kHz in order to avoid receiving false signal from normal environmental infrared sources.
The output of this receiver in interfaced to port 3.0 of the microcontroller. a standard TV remote that delivers infrared codes at 38khz is thus received by the TSOP receiver feeding a 14 bit data so emitted from the remote to the microcontroller through receiver.
The output from the Arduino is fed to the relay driver IC to switch ON & switch OFF the load as sent from the TV remote.
For example if 4 is pressed the corresponding load 4 is switched ON & while it is pressed again it switches OFF according all of the loads are operated.

18. BIBILOGRAPHY Arduino forum www.atmel.com www.beyondlogic.org

19. THANKYOU