ir conroller

8/2/2019 ir conroller

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Banwari Kamdar

Dilip ChoudharyGovind Patidar

Mayank Gangrade

Mr. Nitin Chouhan


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Content Introduction

What is Digital Clock??

Block diagram

Circuit diagram

Description

Required component

Advantages Disadvantages

References


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Introduction The circuit explained

here displays time withtwo minutes digits and

two seconds digits onfour seven segmentdisplays.The sevensegment and switchesare interfaced with

8051 microcontrollerAT89C51.


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What is Digital Clock???A digital clock is a type of clock that

displays the time digitally, as opposed to ananalog clock, where the time is displayed byhands. Digital clocks are often associatedwith electronic drives, but the "digital"description refers only to the display, not tothe drive mechanism. (Both analog and

digital clocks can be driven eithermechanically or electronically, but"clockwork" mechanisms with digital displaysare rare.)


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Block Diagram


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Circuit Diagram
http://engineersgarage.com/content/microcontroller-at89c51


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DescriptionAs soon as the Vcc supply is provided to this

circuit, the clock starts from 00:00. The time

is displayed on four seven segments (incommon anode configuration) by using the

concept of multiplexing. This is achieved by

using timer interrupt (Timer0) of AT89C51

which is configured to refresh sevensegments. The segments are refreshed

many times in a second for simultaneous
http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51http://engineersgarage.com/content/microcontroller-at89c51


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display. The clock runs with a delay of exactly

one second. Timer1 has been used to

produce a time delay of one second. Thedata pins (ah) of all the segments are

interconnected and receive signal from port

P2 of the microcontroller. The control or

enable pins (common anode) are connectedto pins 1-4 of port P1 (P1^0 P1^3).


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The number on 4th segment (displaying the

unit digit of second) is incremented once in a

second as it goes from 0 to 9. The numberon 3rd segment is incremented after every 10

seconds from 0 to 5. Thus seconds are

displayed varying from 00 to 59. The digit on

the 2nd

segment changes after every 60seconds (a minute) from 0 to 9 and so on.

Thus the clock runs for an hour and after that

it resets to zero again.


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AT89C51 Microcontroller

Seven Segment Display

NPN bi-polar junction transistor (Transistor BC547)

Oscillator of 12MHz

Resistor(10K & 330 ohm)

Capacitor(4.7uF,25v)

Supply of +5v

Required Components


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UtilizationBecause digital clocks can be very small

and inexpensive devices that enhance

the popularity of product designs, theyare often incorporated into all kinds of

devices such as cars, household clocks,

radios, televisions,microwave ovens,

standard ovens, computers and cell

phones.


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AdvantagesNo signal losses due to DA and AD

conversion.

Geometry, clock and phase settingsunnecessary, therefore simple to use.

Lower costs as less electronic circuitry

required.


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Disadvantages Low availability of models with digital

interfaces.

Requires graphic board with digital

output


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Reference http://www.engineersgarage.com/microcontro

http://en.wikipedia.org/wiki/Digital_clock
http://www.engineersgarage.com/microcontroller/8051projects/digital-clock-AT89C51-circuithttp://en.wikipedia.org/wiki/Digital_clockhttp://en.wikipedia.org/wiki/Digital_clockhttp://www.engineersgarage.com/microcontroller/8051projects/digital-clock-AT89C51-circuit


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