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DLD Projects

DLD Projects


After working continuously for numerous hours with a strenuous routine of running throughout the campus from the lab to the instructors, to the markets to search for the  components and  then back to the lab again, brainstorming the correct logic, burning countless LED’s, wondering “Oh my!” where in the circuit have the ICs stopped functioning, trying over and over again to make the project work as soon as possible and finally shouting “my circuit  is working!!!”, yes, the sophomores in SEECS, NUST worked really hard in their third semester for their Digital Logic Design projects.

Under the supervision of their respected teachers, Sir Arshad Nazir and Sir Nasir Mehmood, second-year students were assigned different projects of their own choices to test their knowledge of DLD which they had acquired throughout the semester. Every group turned out  to produce some  very innovative projects  by  utilizing their knowledge to find solutions to real-life problems.

IEEE- SEECS interviewed the students whose projects were top-graded; the projects being Tug of war, Sequential Multiplier and a Smart Attendance System.

Sir Arshad Nazir told us that the previous batches had also attempted the first 2 projects but they were not successful. These new groups actually solved the logical problems faced by the previous students.

While Sir Nasir was discussing the smart attendance system, he disclosed that this attendance system is very effective and would be a sigh of relief for the teachers if it is implemented on a large scale. The attendance system is really innovative and very different to all its predecesors.


Haroon Ali Akbar and Usama Pervaiz of BEE-4 A, utilizing the best of their potentials, made tug of war which is a game designed for two players within a time period  of three to four weeks. During the interview, Usama told the IEEE team that this innovative idea was proposed by their instructor, Sir Arshad, who helped them throughout the project. Their main objective was to implement a combinational circuit with increased working probabilities and a reduction in the hardware costs. Haroon adding on to it, discussed the problems they had to face which included “ughh, peeling the wires to the proper size for fitting in the breadboard”, power-supply limitations and the confusing datasheets. Haroon also  told us that previously their seniors had also designed this very game using 10 breadoards, while they designed it with minimum harwdare usage..

They  concluded with the idea that the logic can be used to design a robot responding to the intensity of the light plus a ‘fast finger first game’. They are also planning to work on PCB next time. Good luck to them!


Sequential Multiplier

Ali Athar and Danish Hameed designed a sequential 4 by 8 binary multiplier, an idea proposed by their instructor. The basic principle as defined in their abstract is to apply Booth’s multiplication algorithm to calculate the partial products (by multiplying the multiplicand by each multiplier bit starting from the least significant) then shifting the partial product to the right and then calculating subsequent partial products and finally adding them to the previous product.

The design includes a control unit which receives bits from the rest of the circuit.After accessing the data it outputs the signals. Shift registers have been used for storing the data and a 4-bit adder has been designed to add the partial products. The 12- bit product is being displayed by LED’s.

During the interview, Ali Athar explained the problem they had to face, regarding the toggle switches, which took a lot of time to overcome. The project’s cost was approximately a total of Rs. 2000 and fifteen to twenty man-hours were consumed before they accomplished their task. He also told the IEEE publications team that “it was fun learning DLD as it gave him a good insight of electronics.”

The group threw light upon the fact that these multipliers can be used in ALUs and calculators as they are far better than the combinational multipliers which utilize more hardware.


Attendance System

How can a teacher save his precious time from taking the attendance of a class having strength more than 50?

Yes, the solution to this problem has been designed by Muhammad Ali Tariq, Muhammad Faizan Tariq, Muhammad Usman Ashraf  and Shahzaib Asif of BEE 4 C. An automated attendance system, built under the supervision of Sir Nasir, outshone all others and was graded the best amongst all the end of semester projects by students of section BEE4 C and BEE4-D.

The project implies the idea that every student will have their own identification card while a card reader will be attached along everybody’s desk. The instructor will have an instructions panel that will be used to take the attendance. The students would be able to record their attendance within five minutes of the start of attendance by inserting their cards in the card reader. To ensure the presence of the students in the class, sensors have been attached to the seats. The attendance is automatically cancelled if someone tries to leaves his seat for more than 60 seconds. The instructor can also conduct a poll regarding any topic.

The information is calculated by D-Latches while the no. of absent students is calculated by 2 to 4 line decoders. A clock stopwatch has been designed using 555 timer while pole-display has been made using 3-8 line decoder and OR gates. The LEDs on the main panel will show the no of students present along with their serial no.

Ali told us that he and his group members plan to work on their project in the upcoming summer and design laser detectors that are to be installed on the door panels to mark the absence of students in case they leave the class. They also plan to design a circuit for more no. of students.

He also shared the fact that he and his group members really enjoyed doing the project and learning DLD itself was a great experience. The worst part was during the hardware implementation, their breadboard was about to burn but they managed to save it.

The three groups were unanimous on the fact that to see their circuit working after prolonged hours of gruelling work was one of the best moments in their life.


Comments on: "DLD Projects" (16)

  1. Ethica Mahbub said:

    is it possible to get schematic for this circuit?

    • Thank you for your interest. There are three circuits mentioned in the post above. Schematic for which circuit is needed?

      Muhammad Taihami Tariq
      Web and IT team

      • Ethica Mahbub said:

        schematic for the tug of war
        and for sequential multiplier please.
        thanks 🙂

      • Let me confirm with respective students. I will update you as soon as possible. InshaAllah

        Muhammad Taihami Tariq
        Web and IT team

  2. Ethica Mahbub said:

    have you confirmed? would be very beneficial for me if you would provide me with the schematic soon.

    • Yes, I have confirmed. The students are willing to help in any way beneficial for you. What exactly do you require? Will complete Proteus designs suffice?

      Muhammad Taihami Tariq
      Web and IT team

  3. Ethica mahbub said:

    A complete schematic with the required parts name and model so that it can be recreated in crocodile software please. If you think other software is needed to simulate it please specify. ThankYou. 🙂

    • Students here have used Proteus which is a simulation software. It can be found here.
      Will files of Proteus suffice your requirements?

      Muhammad Taihami Tariq
      Web and IT team

  4. Ethica Mahbub said:

    Yes. Thanks a lot.

    • The students of Tug of War project say:

      “We’d love to share our project’s idea with you but if you want to adapt from our idea, just to make sure that our idea retains its originality we want to have a humble mention of the original idea holders in your version of ‘Tug of War’. I hope this makes it clear for you. Happy thinking! “

      Muhammad Taihami Tariq
      Web and IT team

  5. Ethica Mahbub said:

    inshAllah we will do as you please. 🙂 thanks a lot

  6. malik adnan said:

    is it possible to get schematic for sequential multiplier ?

  7. malik adnan said:


    • Sure. I will tell you as soon as the respective students reply. JazakAllah for your interest.

      Muhammad Taihami Tariq
      Web and IT team

  8. @malik adnan
    Schematics for Sequential Multiplier sent via email.

    Muhammad Taihami Tariq
    Web and IT team

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