About: Ibrar Ayyub

 Introduction The DigiThermo is a device designed for measuring time and temperature used in chemistry laboratory. The circuit of Digithermo employs a 89C4051, 20-pin CMOS Microcontroller with built-in 4kB code memory. Temperature was measured by LM35D, National Semiconductor Temperature sensor producing 10mV/°C. The CA3162, 3-digit DVM converts dc output provided by LM35D and sends BCD […]

We had been hunting for the right tool for a while and iSticky was exactly what we needed! It‘s a really simple way to leave sticky notes on fellow team-mates‘ desktops and coordinate to-do lists. The most important thing is that we don‘t need to open a web page or other app, which is exactly […]

Closed captioning can be extremely helpful in at least three different situations: It has been a great boon to hearing-impaired television viewers. It can also be helpful in noisy environments. For example, a TV in a noisy airport terminal can display closed captioning and still be usable Some people use captions to learn English or […]

Builda digital clock that turns AC load on/off with preset time. sourcecode with sdcc for 8051. The Clock Controller V1.1was designed to be an exemplary of using ‘C’ language to control timer0interrupt, 7-segment LED and keypad scanning. It provides 1-bit sink currentdriving output, for driving a relay, opto-triac, say. Many projects requiring7-segment display and keypad interfacing […]

The project — http://www.onlinecourses.com — is a free and comprehensive resource that is a collection of open college course that spans videos, audio lectures, and notes given by professors at Harvard, Princeton and MIT. They offer highly relevant courses such as iPhone Application Development from Stanford and Cyber Humor from Oxford. This is a wonderful […]

Nematic Phase Liquid Crystals Just as there are many varieties of solids and liquids, there is also a variety of liquid crystal substances. Depending on the temperature and particular nature of a substance, liquid crystals can be in one of several distinct phases (see below). In this article, we will discuss liquid crystals in the […]

Introduction The Saver V5.0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated by schmitt trigger gate CD4093, ~680kHz. Reference frequency was derived from 50Hz […]

General Features Communicate using the hardware serial port on pins 0-1 either with 5V or 3.3V lines. Power the board through vehicle’s OBD2 port. Use standard ELM327 commands also with the new extended ST commands for new functionalities. Low power modes for safe usage of your vehicles battery especially in permanent installations. Superior support of […]

The Game Boy Advance is a major leap for the Game Boy line. It is the first to have a horizontal alignment, and it is 17 times faster than the Game Boy Color, which was released in 1998. Read this edition of HowStuffWorks to find out what’s under the hood of the Game Boy Advance […]

If we design a device with push buttons, it is usually advantageous when we can use the same push-buttons, independently on whether we use them for switch-on, switch-off, change-over,… Moreover, at a modification of a given device, a possibility to change the function of a given push-button without its exchange is often highly welcome. Unimec […]