Infrared Switching of Electrical Appliances Using Embedded Controller Ppt

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Department of Electronics and communication Engineering

RAJAMAHENDRI INSTITUTE OF ENGINEERING & TECHNOLOGY

B.VENKATESH (08MD1A0409)S.NAVEEN KUMAR (08MD1A0457)M.LAKSHMAN KUMAR (08MD1A0442)P.MURALI KRISHNA (08MD1A0451)

BY

INTERNAL GUIDE : Mrs. PARVATHI

CONTENTSINTRODUCTIONBLOCK DIAGRAMMICROCONTROLLERIR RECIEVERPOWER SUPPLYAPPLICATIONS

INTRODUCTION&OVERVIEW

It is an microcontroller circuit to switch on and off electrical appliances.

This system will use general purpose remote control to send the control signal

HARDWARE :GENERAL PURPOSE REMOTE89S52 MICRO CONTROLLERPOWER LEDSIR RECEIVER

SOFTWARE :EMBEDDED ‘CKEIL SOFTWARE

IR TRANSMITTER(GENERAL PURPOSE REMOTE CONTROL)

IR RECEIVER

MICRO CONTROLLER

INTERFACING CIRCUITS

ELECTRICAL APPLIANCES

POWER SUPPLY

BLOCK DIAGRAM

REMOTE TRANSMITTERThe remote transmitter used in this project is

a general purpose remote control used for Phillips TVs.

It sends the control signals, which are in RC5

protocol modulated on a 40khz carrier signal.

MICRO CONTROLLER

• The 89S52 micro controller is used in this project.

• It is in the family of Intel 8051. It is having

256 instructions. It has a 16-bit timer .

• The controller receives the signals, which are in RC5 protocol. It decodes the control signals .

MICRO CONTROLLER 89S52

Pin Configuration

REMOTE RECEIVING UNIT

These signals are converted into electrical signals by the help of IR receiver.

The general purpose remote control sends

the control signals with RC5 protocol. The micro controller receives the signals

and it decodes the control signals.

CIRCUIT DIAGRAM OF REMOTE RECEIVING UNIT

IR RECEIVER

The IR sensor will receive the Infra Red signals send by the general purpose remote control.

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.

Power supply block consists of following units:

• Center tapped step down transformer.• Bridge rectifier circuit.• Input filter.• Voltage regulators.• Output filter.

POWER SUPPLY

POWER SUPPLY CIRCUIT DIAGRAM

CENTER TAPPED STEP DOWN TRANSFORMER

The center-tapped step-down transformer is used to step down the supply voltage of 230v ac from mains to lower values, as the various IC’s used in this project require reduced voltages.

The outputs from the secondary coil which is center tapped are the ac values of 0v, 15v and-15

RECTIFIER UNIT

The rectifier circuit is used to convert the ac voltage into its corresponding dc voltage.

The most important and simple device used in rectifier circuit is the diode.

The simple function of the diode is to conduct

when forward biased and not to conduct in reverse bias.

REGULATOR UNIT

Regulator regulates the output voltage to a specific value.

Whenever there are any ac voltage fluctuations, the dc voltage also changes.

APPLICATIONSController controls speed of fan like ac

induction motor, where unable to access motor.

In every home we use many electrical

appliances switched on and off manually.

In Industries, where a large number or a group of electrical appliances are to be controlled ,this device is much useful.

CONCLUSION

System Features: - Easy operation - Convenient

- Simple - Low cost

Because of these features, the system is more useful in controlling different electrical appliances.