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Showing posts with label Software engineering. Show all posts

Web Data on an LED DisplaY Project

INTRODUCTIION:

It is an alphanumeric LED display that connects via USB to my PC and can display RSS feeds, the weather (like wind chill, above), the time, or just about anything.
When I built my Homemade Digital Clock, I shamelessly over designed it. It had an eight character alphanumeric display (plus two discrete LEDs for a colon), four more discrete LEDs for indicators, two printed circuit boards, and two microcontrollers (three, if you count the GPS it uses as its time source), one of which was running at 20MHz. That’s more processing power than the Apollo spacecraft had on board! All for a stupid clock!
I had a few reasons for this. First was that I had the idea that I might re-use the display for other things in the future. Second was that when all you have is hammer, everything looks like a nail. I’m a software engineer by trade, so my first thought is always to use a programmable microcontroller to solve a problem. I’m so bad that if I needed a square wave, I’d more likely use an 8 pin microcontroller than a 555 chip.

Anyway, when I had my clock’s printed circuit boards made, I had them make several. Now, I’ve added a USB port to one of them, connected it to my PC, and written a program in C# to control it. It can fetch data from local files or the web, extract specific pieces of data, format them and display them on the LEDs. The user can enter C# expressions that evaluate to true or false and cause the discrete LEDs to light up (and even flash). The user can also configure alarm sounds and actions to take when the front panel buttons are pressed.
I’m making my schematic, board layout, and software available for free here. The UI is definitely for techies only, but it could probably be adapted to other PC-controlled displays like those from Crystalfontz and Matrix Orbital.
Here’s a short introduction to the display’s capabilities and UI (if you’re wondering what the computer is in the background, it’s a modern PC in a small form-factor Altair 8800 replica case.

And if you’re considering downloading and playing with the UI, here’s a much more detailed description of it
Finally, here’s the schematic and layout (readable by the open source program Kicad), the PIC 18F4550 firmware (readable by Microchip’s MPLAB and using their free C18 compiler), and the PC UI (readable by Microsoft’s free Visual C# Express):

SCHEMATICS:

DOWNLOADS:

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Secure Mobile Voice over IP Project

INTRODUCTION:

Voice over IP (VoIP) can be defined as the ability to make phone calls and to send faxes (i.e., to do everything we can do today with the Public Switched Telephone Network, PSTN) over IP−based data networks with a suitable quality of service and potentially a superior cost/benefit ratio.
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There is a desire to provide (VoIP) with the suitable security without effecting the performance of this technology. This becomes even more important when VoIP utilizes wireless technologies as the data networks (such as Wireless Local Area Networks, WLAN), given the bandwidth and other constraints of wireless environments, and the data processing costs of the security mechanisms. As for many other (secure) applications, we should consider the security in Mobile VoIP as a chain, where every link, from the secure establishment to the secure termination of a call, must be secure in order to maintain the security of the entire process.

This document presents a solution to these issues, providing a secure model for Mobile VoIP that minimizes the processing costs and the bandwidth consumption. This is mainly achieved by making use of high− throughput, low packet expansion security protocols (such as the Secure Real−Time Protocol, SRTP); and high−speed encryption algorithms (such as the Advanced Encryption Standard, AES).

In the study I describe in detail the problem and its alternative solutions. I also describe in detail the selected solution and the protocols and mechanisms this solution utilizes, such as the Transport Layer Security (TLS) for securing the Session Initiation Protocol (SIP), the Real−Time Protocol (RTP) profile Secure Real−Time Protocol (SRTP) for securing the media data transport , and the Multimedia Internet KEYing (MIKEY) as the key−management protocol. Moreover, an implementation of SRTP, called MINIsrtp, is also provided. The oral presentation will provide an overview of these topics, with an in depth examination of those parts which were the most significant or unexpectedly difficult.

Regarding my implementation, evaluation, and testing of the model, this project in mainly focused on the security for the media stream (SRTP). However, thorough theoretical work has also been performed and will be presented, which includes other aspects, such as the establishment and termination of the call (using SIP) and the key−management protocol (MIKEY).
Source: KTH
Author: Abad Caballero, Israel Manuel

DOWNLOADS:

CLICK HERE TO DOWNLOAD THE COMPLETE PROJECT



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Online Auction in ASP.Net and VB.Net (Computer Project)

INTRODUCTION:

“U Auction” is an online auction web site aimed at taking the auction to the finger tips of aspiring bidders there by opening up the doors of the “OPEN Auction House’ to a wider cross section of Art Lovers and Antique Collectors. This site also acts as an open forum where buyers and sellers can come together and exchange their products. The site makes sure that the sellers get a fair deal and buyers get a genuine product.

Home Page – The site opens up door to aspiring web users through the Home page. The Home page is designed in such way that the layout is as user friendly as possible. There is a navigational menu at the top of the page which links to various inner pages. There is a category drop down on the left side for easy manipulation. The center area is for displaying latest products in the chorological order.

Login/User Registration – Those who wish to take part in bidding or sell products at the site have to register at the site as seller or buyer. Only authenticated users can take part in selling or in bidding. The system automatically rejects un-authenticated users who try to bid or sell at the site.

Register Products – This module is for presenting items for bidding. Only those who have registered and authenticated as sellers can place their articles for bidding. The Module collects information like Product Name, Product Details, Starting Bid amount, Incremental value etc. The system automatically inputs the closing date.

Bidding Module – The module is for bidding on any selected item. The bidder has to authenticate before participating in bidding. The system checks whether the incremental amount entered by the bidder is equal or more than the incremental minimum set during the product registration time. The system places the record in the bid history against the bidder account.

My Auction – This page is an interface for both buyer and seller. Buyer can see the profile of the bidding history of items which are still open on which he/she has already bided. Similarly the seller can see the progress of bidding on articles he/she has placed for bidding.

Feedback – The purpose of the page is to send messages/comments to the web administrator.

FAQ – This page is meant for first time users of the site. The page provided answers to questions which are common and frequently asked.

WebAdmin – This link opens to the administration module which is open to web administrator only. Here site administrator can add product categories and can edit product information like closing date. Also there is an option for administering the closed bids. This module is for contacting the bidder and seller by email instructing them to settle the transaction within a time frame.

DOWNLOADS:

Click here to Download Online Auction in ASP.Net and VB.Net



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