Infrared Remote Controlled Devices

A P r e s e n t a t i o n o n

Infrared Remote Controlled Devices

Presented by:Narayan Jaiswal

Contents

• Introduction• Block Diagram• Components Used• Component Description• Circuit Diagram and Description• Conclusion• Future Possibilities• References

Introduction

• The aim of our project is to design a circuit that one can control home or industrial appliances with the help of a remote.

• When the Infrared sensor receives the signal, the received signal is matched with the code assigned to respective device and toggles its current state.

Contd.

• A TV remote that follows RC5 Protocol is used here.

• Here we are switching 7 LED’s and 1 bulb and also controlling the brightness of a bulb.

• This circuit can be operated from a distance of about 5-10 meters.

Block Diagram

Components Used

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

Components Description

5V regulator LM7805

• It is a regulated power supply IC

• First two number shows positive voltage & last two number shows magnitude of voltage

• Output Current up to 1A

1-Input2-Gnd3-Output

Infrared sensor (TSOP1738)

• TSOP module has an inbuilt control circuit for amplifying the coded pulses from the IR transmitter

• TSOP1738 is sensitive to 38 KHz

1-Gnd2-Input3-Output

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• Eight Interrupt Sources• Low-power Idle and Power-

down Modes• 40-pin DIP

PIC12F675

• 8-Pin FLASH-Based 8-Bit CMOS Microcontrollers

• 6 I/O Pins

• Has a 10-bit A/D converter.

• Has program inbuilt to decode TV remote signals

EEPROM 24C16

• Is a kind of non-volatile memory

• 1 million erase/write cycles with 40 years data retention

• C stands for Standard Version

• Stored memory is permanent until it is not electrically erased

Opto-isolator TRIAC driver MOC3021

• MOC3021 is optically isolated TRIAC driver device

• Combination of LED and a DIAC

• Pin no. 6 is connected to gate of TRIAC for its triggering

• Pin no. 4 with the MT2 of the TRIAC

Dimmer IC

• Dimmer IC is also a programmed microcontroller

• Pin 1 is Vcc, Pin 2, 3, 4 is address D0, D1, D2 and Pin 8 is ground pin

• We are changing the firing angle of TRIAC

TRIAC BTA12

• TRIAC is a switching device of Power Electronics works on AC signal having three terminals MT1, MT2 and GATE

• For BTA12, BT is TRIAC series, A is insulated type and 12 is 12 amp current in the output

• Bidirectional Thyristor, because it conducts in both directions

1-MT12-MT23-Gate

16x2 Alphanumeric LCD

• Very compact and light• Easy to interface with microcontroller• In our project we use it in 4-bit mode

Circuit Diagram

[1]

[2]

[3]

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

Contd.

• 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

Flow chart of program

Application & Advantage

• For Disabled Persons• In School & Colleges• In Shops• For A Patient• This system reduces human efforts

and makes life a bit easy without compromising on the efficiency of appliances.

• Using this system one can also save time.

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.

• Thus by this attempt, ON/OFF process of a device was successfully carried out by just using a TV Remote.

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.

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

[7] Robert Boylestad & Louis Nashelsky, “Electronics Devices & Circuit Theory” 7- Ed.

THANK YOU