1. A mini project presentation On REMOTE CONTROL HOME APPLIANCES Submitted By: N.JEEVAN KUMAR 07681A0425 R.RAJASHEKAR 07681A0469 D.RAKESH KUMAR 07681A0415 N. VIDYA SAGAR 07681A0449 UNDER THE GUIDANCE OF MS.J.ASHA BHAI Asst Professor DEPT.OF ELECTRONICS AND COMMUNICATION ENGINEERING CHRISTU JYOTHI INSTITUTE OF TECHNOLOGY & SCIENCE Colombonagar, Yeshwanthapur, Jangaon (Mdl), Warangal(Dist) 506167, A.P. SEPT 2010

2. Remote control home appliances

3. To obtain a home appliances switching system which is - Easy operation - Convenient - Simple - Low cost

4.  Introduction  Software and hardware requirements  Block diagram  Flow chart  Applications  Conclusion  References

5.  Embedded systems are finding increasing applications  Micro controllers form the basic building blocks for many embedded systems.  The project deals with the development of infrared remote controller of home appliances using Atmel AT89S52 micro controller.  The project is a combination of wireless infrared communication and the embedded systems.

6. SOFTWARE REQUIREMENTS: 1. KEIL MICRO-VISION. 2. EMBEDDED ‘C’ LANGUAGE HARDWARE REQUIREMENTS: 1. MICRO-CONTROLLER (AT89S52) 2. 555 TIMER. 3. TSOP1738 RECEIVER. 4. POWER SUPPLY. 5. TV REMOTE. 6. IR LED

7. Block diagram AT89S52AT89S52 U L N 2 0 3 RELAY1BULB1 RELAY2BULB2 FAN RELAY3 IR RECIEVER POWERSUPPLY REMOTE

8. Power Supply  There are many types of power supply. Most are designed to convert high voltage AC mains electricity to a suitable low voltage supply for electronics circuits and other devices.  A power supply can by broken down into a series of blocks, each of which performs a particular function. For example a 5V regulated supply can be shown as below

9. RC5 TRANSIMITER  IR light is a popular means of wireless communication for remote Control applications  Many different protocol standards such as RC5,RC5X,RC6,…exist for transmitting commands via an IR wireless interface.  This application uses the STM8L10X microcontroller  It sends the control signals, which are in rc5 protocol modulated on a 40khz carrier signal.

10. TSOP1738 RECEIVER

11. The TSOP17 is a miniaturized receiver for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. The IR sensor will receive the Infra Red signals send by the TV remote control. The control signals are modulated on 40khz signal in order to avoid external light. The sensor converts the IR signal into electrical signals with the help of photo diode and amplifies it. It also includes the filter circuit to demodulate the 40khz carrier signal.

12.  Microprocessors brought the concept of programmable devices and made many applications of intelligent equipment. Most applications, which do not need large amount of data and program memory, tended to be costly.  The microprocessor system had to satisfy the data and program requirements so, sufficient RAM and ROM are used to satisfy most applications.The peripheral control equipment also had to be satisfied. Therefore, almost all-peripheral chips were used in the design. Because of these additional peripherals cost will be comparatively high.

13.  In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes  The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning.  The Power Down Mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset.

14.  8K Bytes of In-System Programmable (ISP) Flash Memory  Endurance: 1000 Write/Erase Cycles  4.0V to 5.5V Operating Range  32 Programmable I/O Lines  Three 16-bit Timer/Counters  Full Duplex UART Serial Channel  Low-power Idle and Power-down Modes  Interrupt Recovery from Power-down Mode  Power-off Flag

16. ULN2003  ULN is mainly suited for interfacing between low-level circuits and multiple peripheral power loads. The series ULN20XX high voltage, high current Darlington arrays feature continuous load current ratings.

17.  A relay is an electrically operated switch.  Current flowing through the coil of the relay creates a magnetic field  Which attracts a lever and changes the switch contacts. Advantages of Relay:  Relays can switch AC and DC, transistors can only switch DC.  Relays can switch high voltages, transistors cannot.  Relays are a better choice for switching large currents (> 5A).  Relays can switch many contacts at once.

19. Schematic diagram

20. FLOW CHART : BULB 1 OFF ………….. …

21.  Home automation.  Small scale industries.  Hospitals.  Presentation halls.  Old age homes.

22.  This project presents the Remote controlled home appliances and it is designed and implemented with Atmel AT89S52 MCU in embedded system domain.  Experimental work has been carried out carefully. The result shows the higher efficiency is indeed achieved using embedded system. The proposed method is verified to be highly beneficial for the domestic purpose

23.  MITEL.DATABOOK.COM  ATMEL.DATABOOK.COM  FRANKLIN.COM  KEIL.COM  "The 8051 Microcontroller Architecture, Programming & Applications"  By Kenneth J Ayala.  "The 8051 Microcontroller & Embedded Systems" by Mohammed Ali Mazidi and Janice Gillispie Mazidi  "Power Electronics” by M D Singh and K B Khanchandan  "Linear Integrated Circuits” by D Roy Choudary & Shail Jain  "Electrical Machines” by S K Bhattacharya  "Electrical Machines II” by B L Thereja  www.8051freeprojectsinfo.com