Counter using atmega 8

Enjoyed previous videos???
I programmed atmega8 along with my friend divya alok (class mate) to display numbers (0-9) on a 7 Segment Led.

This is also based on simple I/O pin control




I Hope that you liked it.
Good Day

My First Website using JAVA J2EE & Javascript

I have made a website using jsp & servlets.This was built by me only for educational purpose i.e Learning By Doing process.




Features include :

1. JavaScript for Client Side Validations.

• This makes filling long & tedious looking forms to be filled in seconds.As you can see in the video below, using JavaScripts has made Registration & Login page page more User-friendly
• I have used it to catch some events such as onblur, onfocus etc thrown by the form elements.

2. Ajax

• Ajax makes everything so easy for the client/visitor.It communicates with the server in the background makes available all the data required either from a file or database and makes it available to the user.This all happens without refreshing or loading the page!!!

3. Jsp & Servlets

• This is the backbone of whole project.These are the server pages which listen to the request from the client(actually web-browser) and accordingly is generating a response
• For example - when the user clicks submit on Login page.It is the server page JSP that communicates to the database using an underlying bean ( a java class file).If the user is found then a session is created & attributes are set.Finally user is again moved to the main page.

4. CSS or style tag

• These are used extensively to apply a desired design format on the entire JSP page.

• Best part - In order to change the style/appearance of elements in a page you have two options - i) You would have to place standard html tags in each of the required places throughout the page OR ii)The better way is to set the style for the element types in one place which would effect the whole page.Futher one can have external css which makes the style format once set to be used in many pages.

5. File data Handling

• For Post file data handling has been done which can be used to post data on the website.

6. Jsp & Html

• This was the Best feature incorporated by SUN professionals which makes java web development extremely simple.
• Feature is - you can mix up HTML & JAVA Scriptlets any number of times without hesitation.
• The data you see on the home page which i call posts are actually dynamically read from the disk and presented to you in the form of a table (with border = 0)

7. Flash

• I may not be a pro in using Macromedia flash.But i managed to make the text effects you see in the banner on the top.I have embedded these swf(s) in my blog too.They look COOL!!! Isn't it

8. Session Handling

• It is very important to keep track information about the visitor/user visiting your blog.
• For example - I don't wan't a person to be able to post data to my website unless and until he has registered himself to my website and has Loggined into the website.This is integral for admin management of the website.
• can be done by session handling,cookies,url rewriting,hidden text field.I have used first two i.e Session creation & writing cookies to the client.

If you have any problems/suggestions please let me know
harshtripathi.blogspot.com

Q-2 You need to make your Website scalable.What is meant by Scalable?

If a Website is scalable it means that even if Load increases(large no. of client are trying to access the server) it does not substantially effect the performance & speed of request-response routine.

One of the frequently used technique for this purpose is Caching.

Caching Basics

Retrieving data from the database is time-expensive whereas doing the same from a File/Memory(HashMap) is fast.Therefore it helps the server to deliver the resource quickly.

Caching is done under following conditions -

1. For the data which is frequently demanded from the clients
2. Admin of the website is making changes in the database.Therefore cached data must also be updated.
3. Caching is done for the first request.next time a client tries to access the data, it is fetched from the cached file and not from the database

Interview Questions ( One question per Post )

From now on i will be posting some very basic questions(one question per post) when it comes to Website Development or those asked in an Interview.I thought that this would be the best way to learn things quickly for a newbie.

I have given the answer as per my understanding & would not be responsible for any harm to you with this inf.

Enjoy!!!!...............................................

Q-1 What is HTTP Protocol so much talked about?

Hypertext Transfer Protocol is a Stateless protocol i.e there is no information about which client is making the request.A request is sent by the Client to the Server & Server looks for the resource through buissness logic/Data Model.Then it sends the data back as a response to the Client.It runs on top of TCP/IP protocols and uses basic request-response routine for srving the client.TCP - Transfer Control Protocol is responsible to ensure that file sent from one network node to another ends up as a complete file.Whereas IP - Internet Protocol has the responsibility for routingthe packet of data for reaching it's proper destination.

ROBOTICS BOOK DOWNLOAD 150+

ROBOTICS

Ever found interest in building your own ROBOT the visit the following link.

Download this text file containing to 150+ books

I am in no way hosting links given in the text file.If it violates any norms please inform me.I don't have much inf with copyrights.Thanks for your co-operation

Click here to Download

SOME SAMPLE JAVA SOURCE CODES

1. NOTEPAD beta - it is very basic program for the beginners to make their own notepad.I have BUILT this just for educational purpose to understand basic javax.swing.* and File I/O

2. Database - This is also for educational purpose showing use of JDBC to connect to a MS Access database(*.mdb) and perform some basic operation.

3. Using JMF to capture image from a usb camera and save it to disk after converting into jpeg.

If you are interested in any of the above

Send me mail at harshblog.query@gmail.com i will reply asap

I have made many other cool apps .... KEEP VISITING MY BLOG FOR THEM