This document describes an infrared remote control system using a microcontroller. It consists of the following components: an infrared sensor, microcontroller, EEPROM, opto-isolator, dimmer IC, TRIAC, and LCD. The infrared sensor receives signals from the remote and sends them to the microcontroller. The microcontroller then processes the signals and uses the other components to control electrical devices, such as turning them on and off. The system allows disabled people and others to control devices remotely with infrared signals for convenience.

2. Thanks to our Course Teacher
Rethwan Faiz
Assistant Professor
Faculty of Engineering, AIUB
Name ID
MUKUL HABIBUR RAHMAN 13-24087-2
MORSHED MIR MD. NEWAZ 13-24078-2
HASANUZZAMAN KAZI 13-24511-2
CHOWDHURY SHER HAIDER 13-23941-2
BHATTACHAJEE SHANTANU 13-24674-2
Group Members:

3. Infrared Remote control was developed in late 1970’s
It uses infrared light and photo receptors and it sends
digitally-coded pulses of infrared radiation to control
functions such as power, volume, temperature and many
more.
It uses different light frequencies for different functions.

4. How they work???
Light is sent out by remote control and is received by
phototransistor which is connected with Microcontroller.
They receive signals and transmit signals to device via
radio wave.

5. 5V regulator LM7805
Infrared sensor (TSOP1738)
Microcontroller AT89S52
PIC12F675
EEPROM
Opto-isolator TRIAC driver
Dimmer IC
TRIAC
16x2 Alphanumeric LCD

6. LM7805
 It is a regulated power supply IC
TSOP173
TSOP module is used for amplifying the
coded pulses from the IR transmitter
PIC12F675
It has program inbuilt to decode
TV remote signals
EEPROM 24C16
 It’s stored memory is non-volatile

7. Microcontroller AT89S52
8K Bytes of In-System
Reprogrammable Flash
Memory
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Two 16-bit Timer/Counters
Low-power Idle and Power-
down Modes

8. TRIAC Driver Dimmer IC
TRIAC BTA12 LCD
 Easy to interface with microcontroller
and used in 4 bit mode
 MOC3021 is optically isolated
TRIAC driver device
Dimmer IC is also a programmed
microcontroller
 TRIAC is a switching device

11. Circuit Description
The remote we use, sends a train of bits (0’s and 1’s) of some fixed
length modulated with a 38 KHz infrared signal
The demodulated signal from TSOP sensor is fed to pin no. 2 of IC
PIC12F675
The decoded signal from PIC 12F675 is fed to pin no. 10 (port 3.0)
RXD (serial input port) of AT89S52
Now microcontroller have a simple program that turns ON switch
if OFF and vice-versa
TRIAC and opto-isolators are used for switching of the devices
EEPROM is used to write the current status on LCD

12. Flow chart of program

15. Application and Advantage
For Disabled person
Any School and Colleges
In Shops
For a patient
This system reduces human efforts and makes life a bit easy
Using this system one can also set time

16. Conclusion
This project gives an idea about working of a sensor and
Decoder circuitry.
This project can be used anywhere either at home or offices
Future Work
Due to use of Microcontroller the work presented in this project
can further be extended for web interfaced control application
using Ethernet module like ENC28J60, RTL8019 etc.

17. References & Books
[1] Finney D., The Power Thyristor and its Applications, p. 35, Toronto,
McGraw-Hill Book Company Limited, 1980.
[2] Mahmud S. A., Murtala B. Z. A., Kolo J.G., Leonardo Journal of
Sciences, 11, p. 41-50, 2007.
[3] Remote Control System RC-5 Including Command Tables, Philips
Semiconductors, December 1992, Publication No. 9388706 23011
[4] Delgado, A. R., Picking, R., & Grout, V. (2006) Remote-controlled
home automation systems with different network technologies.
Proceedings of the 6th International Network Conference (INC 2006),
University of Plymouth, 11-14 July 2006, pp. 357-366.
[5[ Muhammad Ali Mazidi, Janice Gillespie Mazidi & Rolin D. McKinley
“8051 Microcontroller and Embedded Systems”, 2006
[6] Kenneth J. Ayala, “The 8051 microcontroller” 2008

19. Thank you