Object counter using 8051

Object counter using 8051 microcontroller. This article is about a simple object counter/visitor counter using 8051 microcontroller . AT89S51 belonging to the 8051 family is the microcontroller used here. This circuit can count the number of objects passing across a line , number of persons passing through a gate/door and so on. The can be simply divided into two sections i.e. the sensor section and the display section. Sensor. The sensor part consists of a ultra bright led (with focus), and LDR, opamp LM324 and the associated passive components. The LED is placed on one side of the door and…

Read More

Zener Diode – Invention History & Story Behind the Development

As we all know, a Zener Diode is used for regulating voltage in practical circuit applications. Though we know about the importance of this device, do we really mind knowing about how it was invented? If you had that query in your mind, then reading further would give you a thorough knowledge on the discovery of Zener Diode and its properties. You shall also be informed of the great scientists who worked on this device. Before going into the invention story, let us have a brief note on what a Zener Diode is. Zener Diode This semi-conductor device permits the…

Read More

Shockley Diode – Invention History

What is a Schockley Diode? In simple terms, a Shockley diode is a four layered semiconductor diode. In electronic terms, it is a “P-N-P-N” diode and is equivalent to a thyristor with a disconnected gate. Though this basic diode does not find much application in electronic circuits nowadays, the concept is largely employed and is one of the remarkable inventions in the history of electronics. The interesting history of the Shockley diode cannot be interpreted without mentioning a few important life events of its inventor, the popular physicist and the co-inventor of the transistor, William Bradford Shockley. To know more…

Read More

Digital Count Down Timer using PIC Microcontroller

In this article, our author Mithun has developed a 0 – 99 min counter using PIC microcontroller 16F628A. So basically this is a digital count down timer ideal for engineering and diploma students for their project requirements. We have given complete circuit diagram of the digital count down timer along with full source code. In addition, photographs of the breadboard setup is uploaded. Every micro controller has a timer unit inside. A timer is nothing more than a time counting device fabricated inside the micro controller unit. A wide range of practical applications require a timer in action. For example,…

Read More

Digital Voltmeter using Micro Controller PIC16F73A

In this article, we have come up with a new PIC micro controller project. Our author Mithun has created a Digital Voltmeter Circuit using PIC16F73A and multiplexed 7 segment displays. The circuit is well explained with diagrams and the source code (written in Embedded C language) is available for download.  If you have any doubts while implementing this project, please feel free to ask in comments. Note:- You may also like to read our Digital Voltmeter using 8051 created a while before. In this circuit, we have created a voltmeter using AT89S51. In addition you will learn about interfacing 7…

Read More

DatasheetLib – A new Datasheet Database Website to revolutionize Datasheet Discovery

Electrical engineers all over the world would bet anything for a better datasheet search engine. Its such an under served  market that there are still rooms for improvement. Although there are hundreds of websites which supplies datasheets in the form of PDF like DatasheetCatalogue, AllDataSheet and many others, recently launched DatasheetLib follows a different approach from the existing players. In this article my aim is to compare different datasheet providing websites and see how they all are different from each other. Analyzing the Home Page Let’s just begin by comparing the home page of above 3 datasheet providers. Our aim…

Read More

Solar Cell – Invention History & Story – From Selenium to Silicon

Invention History of Solar Cells – From Selenium to Silicon Well, the definition of a solar cell is simple. It is a device that directly converts the energy from sunlight into electrical energy. However, its horizons are really vast. The most significant fact is that the invention of this wonderful device didn’t happen overnight. Interestingly, the concept of solar technology is nearly three millenniums old. The first use of this wonderful technology dates back to 7th Century BC. First Recorded Utilization of Solar technology A magnifying glass was used to concentrate the sun’s rays to make fire. And would you…

Read More

Vacuum Tube Invention History and Story behind Invention

The story behind the invention of vacuum tube   Anything in Science has its own history and some hidden truths behind its invention. It must be fascinatingly curious for any science savvy person to know the invention story of technical tools, and other innovations of Science. This is one such write up which will help you know about the researches and the advancements in the invention of the vacuum tubes. Vacuum tube? Vacuum tubes are sealed glass tubes made of vacuum that facilitates the passage of electric current. They are also called as electron tubes and they may be sealed…

Read More

Integrated Circuit Invention History and Story Behind the Scenes

Invention of Integrated circuits – Behind the scene Have you ever heard the story behind  invention of  integrated circuits or what made people work on it? Well, if your answer is ‘No’, continue reading to unveil the truth. This article takes you through the path of invention and developments of integrated circuits. What are Integrated circuits? An integrated circuit is just a small chip that performs multiple functions. It clubs together functions of many electronic components like an oscillator, an amplifier, a timer, a microprocessor and many others into a single chip.It has the capacity to hold any number of…

Read More

Introduction to MATLAB Tutorial

In this article, we are giving an introduction to MATLAB. This article is part of a tutorial series we are developing for MATLAB. We hope you to give us feedback, so that we can improve our MATLAB tutorial series. What does MATLAB stand for? MATLAB stands for MATrix LABoratory. Hence, as the name suggests, here you play around with matrices.  Using MATLAB an image (or any other data like sound, etc.) can be converted to a matrix and then various operations can be performed on it to get the desired results and values. Image processing is quite a vast field…

Read More