REMOTE CONTROLLED DOMESTIC APPLIANCES CONTROL Project Title REMOTE CONTROLLED DOMESTIC APPLIANCES CONTROL Under the Guidance of Submitted by

1. ABSTRACT A typical TV remote sends coded infrared data that is read by a IR sensor with the help of a Microcontroller. This is traditionally RC5 code as followed by remotes from PHILIPS. The same data is then burnt to a microcontroller to drive desired output load through relays or opto isolators and triacs. All the buttons of the remote can be used for as much number of loads to be operated. All the above functions are monitored and controlled by the 8 bit microcontroller

3. PROJECT BLOCK DIAGRAM

HARDWARE REQUIREMENT POWER SUPPLY BLOCK MICROCONTROLLER (AT89S52/AT89C51) RC5 CODE PUSHBUTTON RELAY ULN 2003 TSOP 1N4007 LED RESISTORS CAPACITORS

POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC Filter(470µf) 12V step down transformer

RC5 CODE A common used standard protocol for infrared data communication is the RC5 code, originally developed by Phillips. This code has an instruction set of 2048 different instructions and is divided into 32 address so this makes it possible to change the volume of the TV without change the volume of the hifi The transmitted code is a data word which consists of 14 bits and is defined as: 2 start bits for the automatic gain control in the infrared receiver. 1 toggle bit (change every time when a new button is pressed on the ir transmitter 5 address bits for the system address 6 instruction bits for the pressed key

It is a smaller computer Has on-chip RAM, ROM, I/O ports... MICROCONTROLLER It is a smaller computer Has on-chip RAM, ROM, I/O ports... RAM ROM I/O Port Timer Serial COM Port Microcontroller CPU A single chip

INTERNAL STRUCTURE OF A MICRO CONTROLLER-AT89S52/51 CPU On-chip RAM On-chip ROM for program code 4 I/O Ports Timer 0 Serial Port OSC Interrupt Control External interrupts Timer 1 Timer/Counter Bus Control TxD RxD P0 P1 P2 P3 Address/Data Counter Inputs

Features of AT89S51/52 Compatible with MCS®-51 Products 8K Bytes of In-System Programmable (ISP) Flash Memory Endurance: 10,000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Interrupt Recovery from Power-down Mode Watchdog Timer Dual Data Pointer

Pin Description

TSOP1738 Features:- Photo detector and preamplifier in one package Internal filter for PCM frequency Improved shielding against electrical field disturbance TTL and CMOS compatibility Output active low Low power consumption High immunity against ambient light Continuous data transmission possible (up to 2400 bps) Suitable burst length .10 cycles/burst

Description:- The TSOP17 – series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. The demodulated output signal can directly be decoded by a microcontroller. TSOP1738 is the standard IR remote control receiver series, supporting all major transmission codes.

RELAY IT IS A ELECTRO MAGNETIC SWITCH USED TO CONTROL THE ELECTRICAL DEVICES COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

The relay's switch connections are usually labeled COM, NC and NO: COM = Common, always connect to this; it is the moving part of the itch. NC = Normally Closed, COM is connected to this when the relay coil is off. NO = Normally Open, COM is connected to this when the relay coil is on

RELAY DRIVER (ULN 2003) ULN2003 is a high voltage and high current Darlington transistor array It consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode Clamp diode for switching inductive loads. The ULN2003 has a 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices. Current, Output Max:500mA Voltage, Input Max:5V Voltage, Output Max:50V

Fig: ULN 2003

WORKING OF PROJECT The project uses an IR receiver such a TSOP-1738 that responds to only specific frequency of 38 kHz in order to avoid receiving false signal from normal environmental infrared sources. The output of this receiver in interfaced to port 3.0 of the microcontroller. a standard TV remote that delivers infrared codes at 38khz is thus received by the TSOP receiver feeding a 14 bit data so emitted from the remote to the microcontroller through receiver. The output from the MC is fed to the relay driver IC to switch ON & switch OFF the load as sent from the TV remote. For example if 4 is pressed the corresponding load 4 is switched ON & while it is pressed again it switches OFF according all of the loads are operated.

Soft ware Requirements Keil an ARM Company makes C compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families. Compilers are programs used to convert a High Level Language to object code. Desktop compilers produce an output object code for the underlying microprocessor, but not for other microprocessors.

i.e the programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer). For example compilers for Dos platform is different from the Compilers for Unix platform  So if one wants to define a compiler then compiler is a program that translates source code into object code.

BIBILOGRAPHY “The 8051 Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education. ATMEL 89S52 Data Sheets. www.atmel.com www.beyondlogic.org www.wikipedia.org www.howstuffworks.com www.alldatasheets.com

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