How does touch screen work?

Today we are in the world of touch screen. Everyone when go to buy a mobile or tablet he/she should choose only touch type. In touch type the device the component is used touch screen sensor which is used to take the input from you  gesture like fingers etc. The principle about the working of touch screen is i am going to tell you.  This article is very much interesting because of it working. It is so most popular in the world. Now-a-days every mobile coming in the market has the facility of touch screen.

You can understand the fact that how can touch screen work. What is basic idea behind it.

How to Block Email Address in Gmail

Gmail is one of my favorite Email client and I have used it for almost last  10 years, when it was launched in beta. Now, Gmail is full of features but there are many things which is not as simple as it should be for readers. If you ever tried to block Email address in Gmail, you would know what I meant here. There is no one click button to block any Email address and all you can find is Spam Email.

How to Increase Laptop Battery Life

Laptop gave is the power of portability but still we are very much dependent on laptop battery life when travelling. I’m a Dell Inspiron user and they offer 6 cell battery, which is good enough for 3 hour of working, but since I use my laptop almost 18 hr. a day and I hardly turn it off once in a week, my battery dies soon. Most of the time, my laptop battery drained out within 45 minutes and I have to recharge it. I bought another 9 cell battery and it helped initially but like older one, it also

Add a Free Blogger Chat Box Widget to Your Blogspot Blog

Here’s the easiest way to add a free Blogger chat box widget (also known as shoutbox, chatterbox, or chat room) to your Blogspot blog.

Adding a chat box widget to your blog is an easy way to build community on your site and keep your visitors coming back.

 It’s so easy we can do it in less than a minute. We’ll use Chatroll to create a chat box widget, customize it, and add it to your Blogger

Apply Online Caste , Income and Residential Certificate Bihar Dec- 2012

In Bihar, C.M Nitish Kumar helps the people who want to get their income, cast and residential certificate under RTPS, they can fill out the form and submit online using RTPS website from 1 december 2011. Now -a -days one can fill the form online from his/her office. It will start from 1 december 2011 at 10:00am.

One can follow the instruction for the filling out the form,which are as follows............

Burning hex files using USBasp

AVRDude is excellent program for burning hex code into microcontroller. USBasp is awesome USB based programmer for the AVR. In this tutorial we will see how to use AVRdude for burning hex files into AVR microcontroller using USBasp.

AVRdude is not readily available for windows installation. Windows version of AVRdude is bundled with WinAVR compiler. Before we start : Download WinAVR from here.

USBasp driver installation

In this post we will see how to install windows driver for USBasp. Steps explained below are applicable for WindowsXP:

Download driver:
If you don’t have driver, windows drivers for USBasp can be downloaded from:
http://www.fischl.de/usbasp/usbasp.2009-02-28.tar.gz
Extract the downloaded archive into some directory.

AVR programmer

Make your own, ultra simple, universal AVR programmer !!

Two types of AVR programmers can be built :

1)Parallel port
2)Serial port

---

PARALLEL PORT :

Introduction to AVR

AVR Tutorial

AVR microcontrollers from ATMEL are very good choice for designing mid-range embedded systems.They are 8Bit RISC controllers. They come in many verities and most of them gives 16MIPS (Mega Instructions Per Seconds) throughput at 16MHz . 

Unlike most of the popular PIC microcontrollers, AVRs have powerful instruction set, most executing in 1 cycle. Recently ATMEL has introduces some new controllers with speed upto 20MHz and USB support.

Using Ping To Test An Internet Connection

A simple way to test your internet connection is to use the Ping network command. Ping is built into Windows and tests whether you can reach a particular website – it also measures the round-trip time to receive a reply from that website.

Ping is an easy way to test if your actual internet connection is faulty or if the problem lies elsewhere – e.g. just with your web browser or viruses. When reporting a problem to your

How To Reset Your Windows 7 Password

Reset Windows 7 Password

You’ve probably landed on this page while looking to find out how to reset Windows 7 Password. Whether you’ve simply forgotten your password, or you want to gain unauthorized access to someone’s Windows 7 account, I’m going to show you a really easy way how to reset Windows 7 password, without having to buy or download any third-party software.

How to Speed Up Your PC

How To Make Your PC Faster

This is a tutorial on how to make your PC faster. It’s a mixture of options, tweaks and maintenance, some of which are absolutely essential to keeping your operating system at its best.

It is focused around Windows 7 and Vista but most of it still applies to XP.

Download All Your Facebook Information

By now you have been using Facebook for years and years. So, of course, you have a lot pictures, emails, videos and messages stored in your account.

Some people use Facebook as the primary mode of archiving their personal data. This can be dangerous because there are instances where people are hacked or banned from Facebook.

Losing this precious data would be devastating.  Facebook has the ability to archive your data.

Protect Your PC Using a USB Flash Drive

Now you can protect you PC by just using a USB flash drive. This is possible due to a great software called Predator. 

 Predator locks your PC when you are away, even if your Windows session is still opened.

 It uses the USB flash drive as an access point. Using the software is really very easy.

Lock And Unlock your Computer with a USB Drive

Guys, Here Goes Some Small Applications with which you could be able to protect your computer with your own USB, that exactly means that to Lock or Unlock your computer you first have to insert your own USB for it.  If you would not be using the USB then you can't be able to access your own computer, as you would see a "Access Denied" Error Message...

The Predator, A Software Application For Windows Platform which will do this job very easily. It'll lock your computer system and in turn make your USB into a Key to Lock or Unlock Your

5 Windows 7 Tips, Tricks and Secrets.

Windows 7 seven users are increasing day by day and it gives you some much of fun exploring the tips, tricks and hidden secrets in windows 7. In this post we had given some of our user suggested tips, tricks and secrets, lets fly around them!!!

PSR(Problem Steps Recorder):
 

Window 7 has a great inbuilt future called "PSR - Problem Steps

Find Out Who Is Connected To Your Wireless Router

Wireless Network Watcher is a simple free utility that scans your wireless (or wired) network and displays a list of all computers and devices that are currently connected to it.

Use it to find out who is connected to your wireless router.

Why Worry About Unknown People Connecting?

1. Illegal downloads – if intruders download illegal content via your connection the police will come knocking at your door, not theirs. It may be very difficult to prove you were not responsible.

How To Fix BOOTMGR Is Compressed Error Message

The following error message may appear at startup:

BOOTMGR is compressed

Press Ctrl+Alt+Del to restart

There is no way to boot (start up) to Windows – pressing Ctrl+Alt+Del just restarts the computer and redisplays the same message.

I saw this error recently on a customer’s computer and though I’d share how to fix it – it can affect XP, Vista or Windows 7 computers.

Interfacing of Led's with AT89C52

Summary:

This article introduces you to the very basic operation of taking an output from the microcontroller AT89C51. It demonstrates the principle behind interfacing LEDs with 8051 microcontroller. Here we have demonstrated the aforesaid principles by blinking LEDs continuously i.e., switching them on and off.

AT89C51, which belongs to the family of 8051 series of microcontrollers,

How To Check If A Computer Is Overheating

Skill Level: Medium
 

Overheating can damage the vital components in a computer. Modern computers try to protect themselves from overheating by shutting down before damage can occur.

If this happens to you, don’t ignore it – shutting down can be an early warning sign of serious damage to come if the cause of overheating is not fixed.

It can create software problems too – just like powercuts, sudden shutdowns may cause corruption in Windows files (e.g. the

Send email from a back date

As the name says, "Send email from a back date(1975 or anything)", i.e. send an email using a date that is passed, say 1975!

It sounds impossible, but its not. Its so simple. So, in this tutorial, i will teach you how to send en email from a back date. No email registration/signup required.

You can send email as guest. This tutorial was also on future date, but it was not working with all email accounts. That's why i removed future date. Now, this tutorial is just for back date.

Steps:

VHDL Code For D Flip-Flop

Source Code for D-Flipflop :-

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity dff1 is
    Port ( data_in : in  STD_LOGIC;
           clock : in  STD_LOGIC;

VHDL Code For JK Flipflop

Program For JK Flip-flop:

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--use IEEE.NUMERIC_STD.ALL;

VHDL Code For T Flipflop

Program For T Flip-flop:

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating

---- any Xilinx primitives in this code.

--library UNISIM;

VHDL Code For SR Flipflop

Program For SR Flip-flop:

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating

---- any Xilinx primitives in this code.

VHDL Code For Comparator (4 bit)

4-bit comparator

Source Code of 4-bit comparator :-
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;


entity comp1 is
    Port ( A : in  STD_LOGIC_VECTOR (3 downto 0);
           B : in  STD_LOGIC_VECTOR (3 downto 0);

VHDL Code For 1:4 Demux

Program For 1:4 Demux using Behavioral Modelling:-

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

VHDL Code For 4:1 Mulitplexer

Program For 4:1 Multiplexer using Behaviroal Modelling:-

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

VHDL Code For 8:1 multiplexer

Multiplexer is simply a data selector.It has multiple inputs and one output.Any one of the input line is transferred to output depending on the control signal.

This type of operation is usually referred as multiplexing .In 8:1 multiplexer ,there are 8 inputs.Any of these inputs are transferring to output ,which depends on the control signal.For 8 inputs we need ,3 bit wide control signal .

Working:If control signal is "000" ,then the first input is transferring to output line.If control signal is "111",then the last input is transferring

VHDL Code For 2:4 Decoder

Source code for Decoder 2:4:-
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity decod1 is
    Port ( I0 : in  STD_LOGIC;
           I1 : in  STD_LOGIC;
           En : in  STD_LOGIC;
           Y : out  STD_LOGIC_VECTOR (3 downto 0));

VHDL Code for 3:8 decoder

Source code for 3:8 decoder:-

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity decoder3x8 is
Port ( i : in  STD_LOGIC_VECTOR (2 downto 0);
y : out  STD_LOGIC_VECTOR (7 downto 0));
end decoder3x8;

architecture Behavioral of decoder3x8 is

begin

VHDL Code For Encoder (4:2)

Source Code of Binary Encoder 4:2:-
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity encod is
Port ( a : in  STD_LOGIC_VECTOR (3 downto 0);
b : out  STD_LOGIC_VECTOR (1 downto 0));
end encod;
 

CODE STRUCTURE OF VHDL

 

Every VHDL code contains at least 3 parts. They are

1 )Library Declaration

2)Entity Declaration

3)Architecture body

Let us discuss these parts in brief

1)LIBRARY DECLERATION

Introduction to VHDL

VHDL is the acronym for Very High Speed Integrated Circuit Hardware Description Laguage.It is a Digital Integrated circuit design tool ,which is widely using now.

There are many tools in IC designing that can be used in place of VHDL(Example Verilog).But VHDL is the most poplar HDL among all HDLs now using in industry.Initially VHDL was developed by U.S Department of Defence.