Welcome to IEEE-SEECS

DLD Projects


 By Maryam Hassan

The talented students of BEE-5 successfully completed their DLD semester projects by the end of their third semester. They learnt a lot through these amazing projects and some of them outshined all others. IEEE-SEECS interviewed few of these outstanding projects as described below by our talented writer Maryam Hassan. We hope you have a good read.

Density Calculator:


The idea behind their project ‘Density Calculator’, as Hamza Afridi explained, was that they wanted to do something outside the box, something that not everyone was doing. He further explained that they knew the simple things it would take, that is mass and volume, to compute the density. Amama Mahmood described the general working of their project by first explaining that it had two basic modules. This included mass in binary for which they used sensors and got the result in the form of voltage signals which they then amplified and converted to binary. This was the dividend in the divider circuit. The second part of the module was the volume. They computed that by monitoring the change in water levels using sensors, and simply using adders to add the two up to find the difference. This was the divisor in the divider circuit, which was interestingly enough a combinational circuit. Because usually such circuits are sequential circuits but they managed to rid of all the complexity and boil it down to a combinational circuit. And thus by dividing mass over volume, density was calculated. Some of the ‘many’ problems, Wajiha Ali mentioned were that the voltage they were getting was very little even after the amplification of the signal and due to the rusty breadboards, they had to patch the whole circuit twice. Amama also pointed out that whereas the prices for most density calculators go as high as $10,000, they were very proud of the fact that they got everything done in under 5,000PKR.

4-bit Arithmetic Logic Unit:

DLD Projects

 This project, in a nutshell, was a simple calculator with a memory having a Function Unit and a Control Unit. Uzair Akber explained that the idea behind the project they did was a Microprocessor that inspired them to take on this project. He further explained that they wanted to create a small Microprocessor and have in that the workings of a simple computer. Their project consisted of three modules; a Memory Unit, which had two 4-bit registers, a Control Unit for implementing the functions and then the Function Unit which had eight functions namely addition, subtraction, comparator and bit-wise functions like AND, OR etc. Ali Qasim Naqvi pointed out the two main difficulties that they faced in the implementation of the project. Firstly, in designing for the 8-bit ALU, he said that there were a lot of wires for the Multiplexer and the circuit was getting too hard to debug so they had to switch to the 4-bit ALU. Secondly, for the PCB design it was still very hard to squeeze the complicated circuit on a 6×6 inch PCB sheet for which Ali explained that they had to go for the double sided design to achieve the result. He also added that instead of using extra OR gates which they were using for switches, they simply used the Vcc to control the circuits, gaining them a power efficiency of about 70% as they now were using one circuit instead of eight. They hope to continue their work on their project as they say it will help in their current course, Microprocessor Systems, as well.



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