barcode reader application in asp.net Requirements De nition in Software

Generate QR Code 2d barcode in Software Requirements De nition

Requirements De nition
Quick Response Code Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Print Quick Response Code In None
Using Barcode printer for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications.
The most important thing that you can do before starting to design and code a PIC microcontroller application is to create a set of requirements for your application. These requirements will help you to understand what is required to do the project and allow you to check off whether or not you are meeting the original design requirements. When you rst start developing PIC microcontroller applications, you should be very rigorous in de ning the requirements of your application because this will allow you to keep track of what you are doing and not get overwhelmed with the task in front of you. The rst thing that I like to do is to create a simple, one-sentence objective statement specifying what the project is supposed to do. Experts in cognitive functioning will tell you that the human brain can only retain 25 words of information at one time, and your objective statements should never be longer than 25 words to avoid the need for your coworkers and customers to go back over the objective statement because they can t remember the full statement. Some examples taken from the experiments, projects, and tools in this book are
QR-Code Scanner In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Draw Quick Response Code In Visual C#.NET
Using Barcode creator for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
REQUIREMENTS DEFINITION
Print Denso QR Bar Code In .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
QR Code ISO/IEC18004 Printer In VS .NET
Using Barcode drawer for .NET framework Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
I want to create a PC-controlled programmer that is easy to build and will work with virtually all available PCs. I want to demonstrate how the operation of the PIC microcontroller s inputoutput (I/O) pins can change state inadvertently when a high output is pulled low by peripherals. This project will convert an NRZ serial data stream to LCD character data at 1200 and 9600 bps. Many of these application description statements can be found in the rst paragraph of the application write-ups presented in this book. I always feel that you must be able to describe what you want to do simply and concisely. This statement becomes a guide for you to follow when you create your other requirements de nitions. Next, the physical requirements for the application must be stated. These requirements specify the external requirements that will drive the circuit and software requirements that follow. A good list to have is
Denso QR Bar Code Generation In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
Data Matrix Maker In None
Using Barcode maker for Software Control to generate, create DataMatrix image in Software applications.
1 2 3 4 5 6 7 8
Draw Code 3 Of 9 In None
Using Barcode encoder for Software Control to generate, create Code 3/9 image in Software applications.
Printing EAN 128 In None
Using Barcode generator for Software Control to generate, create GS1 128 image in Software applications.
What is the desired size of the project How much power does the project consume What is the power source What type of circuit carrier/board is to be used Who will be using the project What are the user interfaces What are the safety concerns How much should the project cost
Encode ANSI/AIM Code 128 In None
Using Barcode generation for Software Control to generate, create Code 128C image in Software applications.
Painting Bar Code In None
Using Barcode creation for Software Control to generate, create barcode image in Software applications.
For many of these questions, your answer will be None or No restrictions. Even though some answers may be vague, you are still narrowing down what you want to do. Next, I decide on the hardware that is appropriate for the project. This list includes
RM4SCC Creation In None
Using Barcode maker for Software Control to generate, create British Royal Mail 4-State Customer Barcode image in Software applications.
Create GTIN - 128 In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create EAN 128 image in ASP.NET applications.
1 2 3 4 5 6 7
Code-39 Generator In None
Using Barcode encoder for Office Excel Control to generate, create USS Code 39 image in Excel applications.
Making UCC - 12 In None
Using Barcode generator for Microsoft Word Control to generate, create GS1 128 image in Microsoft Word applications.
What is the desired PIC microcontroller to be used What type of clocking will be used What kind of power supply Input devices Output devices Storage devices Part availability
EAN / UCC - 13 Maker In None
Using Barcode creator for Online Control to generate, create EAN / UCC - 13 image in Online applications.
Paint Code-39 In .NET
Using Barcode generator for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
These questions probably seem very straightforward, except for the last one. As I write more books, I am discovering more and more that what I think is easy to nd often isn t. When I rst designed the el cheapo programmer, I used a P-channel MOSFET that I could find easily from a variety of sources. Unfortunately, this wasn t true for many other people. I changed the transistor to a 2N3906, a very common PNP transistor, and the complaints stopped and acceptance of the programmer increased.
Generate Barcode In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Code 3 Of 9 Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
PIC MICROCONTROLLER APPLICATION DESIGN AND HARDWARE INTERFACING
Next, I prepare a list of requirements for software. These requirements include
1 2 3 4 5 6
Language application written in Simulator availability Programmer availability Interrupts to be used Built-in application interfaces to be used Data structures to be used
I should point out that all the lists of requirements are interconnected. You may assume initially that a speci c PIC microcontroller device is to be used only to discover that it is not appropriate for other requirements or that it may have capabilities you don t require. You may note that I don t include an expected application size, which would help you to select the PIC microcontroller that will be used. When you are rst starting out, it can be very dif cult to predict what will be the nal size of an application. I ve been doing it for years, and I still can be off by 50 percent or more with what I guess at. Often I will specify a device with double the program memory that I think I will need. As you develop your requirements list, you may feel that the different requirements are mutually exclusive; you can want to use a certain PIC microcontroller part number, but it doesn t support the features required in software. You may nd that your suppliers cannot reliably provide you with the parts that are required. If this is the case, you may nd that you have to go back and change your original de ning statement. This is really not a serious problem. As you work through the requirements, if you are willing to work objectively with your requirements and the assumptions on which they re based, you will nd that you can get a solid set of requirements that will lead you to a successful application.
Copyright © OnBarcode.com . All rights reserved.