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
