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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
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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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Welcometo the Queries