DEVICES CONTROLLING THROUGH PC

7/30/2019 DEVICES CONTROLLING THROUGH PC

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DEVICES CONTROLLING

THROUGH PC

C.SRIDIVYA

(07N71A0411)


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OBJECTIVE OF PROJECT

The main objective of the project is

to describe a new economical solution

to home operating devices using pc.


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NEED OF PROJECT

Drastic increase in the usage of

computers.

Now a days more time is spent on

computers so it became necessary to

design a device for controlling

switches from computer.


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NEED FOR

EMBEDDED SYSTEMS

Flexibility

Ease of programming

Cost EffectiveTime complexity

Scenario Independent

Reliability


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EMBEDDED

SYSTEMS

Embedded system is a combination of

hardware and software.

Embedded system is a specialized

system that is a part of larger system

or machine.

Embedded systems are electronic

devices that incorporate

microprocessors within their

implementations.


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REQUIRMENTS

AT89S52

Micro controller

P.C

Relays

ULN 2003

A.C devices

Tool : keil microvision

Platform : windows

Language:Embedded c

HARDWARE COMPONENTS SIMULATION


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BLOCK DIAGRAM

A

T8

9

S

5

2

RS232PC

RELAY

RELAY BULB

MOTOR

KEY BOARD


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SCHEMATIC DIAGRAM


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POWER SUPPLY


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TRANSFORMER

Output Waveform of transformer


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RECTIFIER

Output of the Rectifier


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SMOOTHING

Fig Smoothing action of capacitor


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REGULATOR


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Transformer + Rectifier + Smoothing + Regulator:


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Of all the 8-bit micro controller available in the market

the main answer would be:

It has 8kb on chip flash memory which is just sufficient for our

application. The on-chip flash ROM allows the program

memory to be reprogrammed in system or by conventionalnon-volatile memory programmer.

Moreover ATMEL is the leader in flash technology in todays

market place and then using AT89S52 is the optimal solution.

SPECIFIC FEATURES:

Systems using these may be earlier to implement due to large

number of internal features

These are also faster and more reliable.

WHYAT 89S52 ?


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AT89S52 MICRO CONTROLLER

FEATURES

4.0V TO 5.5V Operating Range

Fully Static Operation :0 Hz to

33Mhz 32 Programmable i/o lines

256*8 bit internal Ram

Three 16 bit timers/counters

low-power idle and power-downmodes


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MICRO CONTROLLER PIN DIAGRAM


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SERIAL COMMUNICATION

Computer transfers data in 2 ways :

parallelserial

Serial data communication uses 2 methods:

synchronous

Asynchronous


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RS-232

. A "Space" (logic 0) will be

between +3 and +25 Volts.

2. A "Mark" (Logic 1) will be

between -3 and -25 Volts.

3. The region between +3and -3 volts is undefined.

4. An open circuit voltage

should never exceed 25

volts. (In Reference to GND)

5. A short circuit currentshould not exceed 500mA.

The driver should be able to

handle this without any

damage.


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MAX 232

Operates With Single 5-V Power

Supply

Lin Bi CMOS Process TechnologyTwo Drivers and Two Receivers

30-V Input Levels

Low Supply Current . . . 8 mA Typical

Meets or Exceeds TIA/EIA-232-F and

ITU

Recommendation V.28


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MAX 232 CIRCUIT


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ULN DC MOTOR DRIVER

PIN DIAGRAM OF ULN-2003

Seven darlington per package

Output current 500ma per

driver

Output voltage 50v

Transient protected outputs

FEATURES OF ULN-2003


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RELAY

Relay is an electrically operated switch.

Relays switch connections are usually contains

COM

NC

NO


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ADVANTAGES OF RELAYS

Relays can switch AC and DC.

Relays can switch high voltages.

Relays are better choice for switching large

currents.

Relays can switch many contacts at once.

Relays can be used to implement boolean logic


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KEIL VISION

Vision3 is an IDE (Integrated Development Environment) that helps you

write, compile, and debug embedded programs. It encapsulates the following

components:

A project manager.A make facility.

Tool configuration.

Editor.

A powerful debugger.


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PROBLEMS WITH EXISTING SWITCH

SYSTEM

Electrocution

Time wastage

Friction

Bad switch control


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CONCLUSION

The DEVICES CONTROLLING THROUGH PChas been achieved successfully usingmicrocontroller unit.

This work is recommended to be used in industries,

large firms manufacturing industries e.t.c. This is toprovide easy and safe use of the electrical devices.

We used PC BASED DEVICE CONTROLLING to achieve various device controlling like motor,bulb. For this fixed numbering is programmed by

using the microcontroller. And the program hasbeen successfully tested and verified for severalspecified loads.


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THANK YOU

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DEVICES CONTROLLING THROUGH PC