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DIGITAL STOP WATCH Group membersSyed Talha Mairaj Essay

Paper type: Essay Pages: 2 (405 words)

Views: 153


Group members

Syed Talha Mairaj : ID 9457

Adi Samama : ID 9359

Shahzaib Umer : ID 9346

Class Id :100616

Department of Electrical Engineering

PAF-KIET, Karachi


We use Stopwatches for many purpose.Particularly it uses in different competition and sports activities .

Stopwatches may be analog or may digital . We use Stopwatches to find out how much time we take to

do any activity. Mostly we use digital version of stopwatches because it is more accurate as compared

to analog version of stopwatches and it is very easy to use .

We made this stopwatch to observe the

accuracy and reliability of it.

This Stopwatch can count approximately up to 9 minutes and 59.9 seconds . It is accurate upto 0.1

seconds . This circuit is very easy and simple to understand . The most important part of this circuit is

(multi-vibrator) which followed by 7-segment decoder stages and counter . we use voltage regulator to

convert 9 volts to 5 volts .



We choosed thir project because it covers all the aspects of our course Digital Logic Fundamentals

(DLF) . Particularly we choose it to observe and realize the working of Multivibrator and 7-segment

Decoder . Oyur aim is to implement our knowledge practically and observe that what we have learned

from this course . This stopwatch is use in small time intervals competitions . This stopwatch has several

different functions including pause which represents both start & stop , reset . I think this project will

improve our teamwork , our skills and help us to gain more experience in working together . The class

lectures was very helpful with thus project because it covered important topics such as multiplexers ,

decoders , counters and 7- segment display .

555 timer IC is used to provide the time delays, as an oscillator , and as a flipflop element .

(2) In this circuit we used 7 – segment displays for displaying the decimal numbers or numerals.

(3) 4033 IC is used in digital display . It has a 5 stage decade counter with decodr which convert

the code to a 7 – segment decoded output which can be seen by the help of 7 – segment display.




In this project we are used simple components:


7- segment common cathode 40 4 160

555-timer IC 10 1 10

4033 IC 50 4 200

voltage regulator 20 1 20

battery 9v and battery cap 60 1 60

push button & on\off button 30 1 30

capacitor 5 1 5

LED 5 1 5

resistors 10 4 10


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DIGITAL STOP WATCH Group membersSyed Talha Mairaj. (2019, Nov 14). Retrieved from https://studymoose.com/digital-stop-watch-group-memberssyed-talha-mairaj-best-essay

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