1. By Abhiraj - 094G1A0401 Meharaz - 094G1A0444 Hitesh Jain - 094G1A0429 Mohisin Akram - 094G1A0447 Under the guidance of ”Smt. Kanthamma, M.Tech “ Assoc.Proff Dept of Electronics and Communication Engineering SRIT, ANANTAPUR Batch 0922

2. ABSTRACT To develop a project, which uses RF technology that keeps control of the various appliances. In industries there are lot of switches are controlled by hands. In some situations switching will be more dangerous. To avoid this type of problems we can make the use of RF based multiple device switching system.

3. EXISTING SYSTEM In Existing System We Are Using IR Communication. It Is Line Of Sight Must. Maximum Distance Is 2 To 3 Meters. IR TECHNOLOGY Lies between microwaves and visible light. In infrared communication, Transmitter : LED transmits non-visible light. Receiver : Photodiode or photoreceptor.

4. Drawbacks of IR Line of sight Blocked by common materials Short range Light, weather sensitive Speed

5. PROPOSED SYSTEM PROPOSED SYSTEM Microcontrollers are dumped with the program by the Keil Software. The signal is transmitted by an RF transmitter and received by an RF receiver to switch on or switch off the desired device by the help of mc. Capability : 15 Devices. Range : 5 to 10 meters.

6. Introduction to RF technology RF waves are electro-magnetic waves which will travels perpendicular to each other. This waves propagate at the speed of light. The frequency of RF waves, however, lower than those of visible light, making RF waves invisible to human eye.

7. BLOCK DIAGRAM Keypad ENCODER RF Transmitter TRANSMITTER SECTION: Micro Controller AT89C2051 The microcontroller continuously reads the status of the keys on the keypad. When any key is pressed, data is passed to the encoder and then to the RF transmitter from where it is transmitted. Power supply

8. RF RECEIVER DE CODER Micro Controller (AT89S51) POWER SUPPLY RELAYS 1 BULB LED ‘s RELAYS 2 fan RECEIVER SECTION : This decoder serially converts the serial bit data into 4 bit data at a port of microcontroller AT89C51. The microcontroller energizes the corresponding relay through a relay driver. Devices are connected to normally-open contacts of the relays.

9. Advantages of RF Not line of sight. Not blocked by common materials: can penetrate most solids and pass through walls. Longer range. Not light sensitive. Not as sensitive to weather/environmental conditions. 5V operation Transmitter Frequency : 433.92 MHz Receiver Frequency : 433.92 MHZ Low Cost Small size

10. Applications Home Applications Industrial Applications Car security system Remote Lighting Controls Wireless Alarm and Security Systems

11. Conclusion Better than the IR technology. By using this project, we are controlling the appliances with the help of the RF communication. Thus without manual involvement we can control devices automatically by using remote.

12. REFERENCES Ahmed M. S., Mohammed A. S., Onimole T. G., Attah P. O., Leonardo Electronic Journal of Practices and Technologies,9,p.55- 62, 2006. Mahmud S. A., Murtala B. Z. A., Kolo J.G., Leonardo Journal of Sciences, 11, p. 41-50,2007. Kolo J. G., Daudad U.S., Leonardo Journal of Sciences, 7, p. 175- 186 2008. Bergmans S., Oisterwijk, Sony SIRC Protocol [online]. Available at: http://www.sbprojects.com/knowledge/ir/sirc.htm. Philips Semiconductors Application note, Power Control with Thyristors and Triacs [online]. Available at: http://www.fairchildsemi.com/an/AN/AN-3006.pdf Finney D., The Power Thyristor and its Applications, p. 35, Toronto, McGraw-Hill Book Company Limited, 1980.