simple pcb design software

?AcyclicDependenciesPrinciple————————————————————————————The above principles may be some college school, but also may be too theoretical, I said here is also relatively vague and simple, here is just a general picture, if you want to know more things, we can more Google a bit.But these principles do not seem difficult, but it is not so easy to use them well. To be able to use these principles well and without dogma, my experience is as follows: (I th

Reprint Address: http://blog.jobbole.com/685/the following principles, not just software development, can be extended to other production activities, even in our lives .Don ' t Repeat yourself (DRY)Dry is one of the simplest laws and is the easiest to understand. But it can also be the hardest to apply (because to do so, we need to do a lot of work on generic design, which is not an easy task). It means tha

A large project must be designed first, but must be designed first. Before design, the requirement analysis is required. Requirement analysis is to understand what users "do". Requirement Analysis includes understanding the functional and performance requirements. Only after understanding the user's needs can we design them again to ensure rework after the project is completed. The

A good start is half the success The initial architecture design determines the survival of software products. "A good start is half the success ". The initial architecture design is also the most difficult. We need to investigate the situation and technical characteristics of similar products and learn about the theoretical support and technical platform suppor

maintenance personnel often find problems in the system, but do not dare to modify it easily, especially the underlying part of the system. The reason is very simple: the system has been running well and there are no errors, and because there is no complete documentation, there is a worry that new problems will occur after the changes. This concern reflects the fact that programmers have doubts about whether the current

Free Open source 3D model design software Summary3D printing needs to be modeled by computer-aided design (CAD), and then the 3D model is "split" into layers of cross-sectional sections, thus directing the 3D printer to print on a per-layer basis. Therefore 3D models for 3D printing are mostly stored or exported as. stl file formats. Here is a summary of the curr

Recently, some online friends have asked me questions about the choice of EDA software. Let's write them here. It takes a long time to play this role. The words of the family are for reference only. When talking about the software for Drawing Circuit Diagrams and PCB diagrams, you may first think of PROTEL, which is the most used in Chinese universities, especia

programming;Second, according to the module composition of the method to become;Thirdly, the program only contains order, judgment, and looping constructs.Structured design language structure is simple and clear, modular, and descriptive approach to the way people are accustomed to reasoning, so readability is very good, and in the reuse of software and maintena

Men conquer the world, women conquer the world by conquering men; hardware is everywhere, and software controls hardware to conquer the world. In today's world, looking at the rivers and lakes, there are embedded software where there is electronics, and where there are electronic faults, there is also the shadows of embedded software

Original Title: Code Simplicity: The Science of development by kanat-Alexander, M .) [Introduction to translators] Translator: Yu Sheng series name: Turing Program Design Series Press: People's post and telecommunications Press ISBN: 9787115302380 Release Date: January 2013 published on: 32: version 1: 1-1 category: Computer> Software Engineering and software met

contract has even been clearly required, and there is not much balance to be done at this time. For a product-type software, the functions used by more than 80 users should be well designed for ease of use and outstanding performance, and a large amount of manpower R D should be invested, those 50% of users can use less manpower and time, and those 5 of users can use the functions that require a large amount of time or even discard them. However, th

Finally, I have read Mr. Zhang Yi's book "Essentials and patterns of software design", and I am deeply impressed by his understanding and explanation of software design, I have a new understanding of the software design process an

database driver, generally, class is used. forname (); create a connection object with the database; create an SQL statement object preparedstatement (SQL); Submit an SQL statement and use executequery () or executeupdate () according to the actual situation (); display the corresponding results; close the database. Tip: Strictly speaking, the simple factory mode is not a design mode. The

. expert users: expert users are willing to explore your products or services. These users account for a minority of the total. 2. Random users: Random users may have used similar products or services and are interested in using more complex products. However, they are reluctant to access brand new products unless new features are simple enough. There are few such users. 3. Mainstream users: Mainstream users are the largest groups. They use produc

modular encoding. Problems Involved What is transparency and can be explicit? Why should software design be transparent and explicit? What is the principle of transparency and explicit encoding? How can we bring transparency and controllability during design? Author's Point of V

this stage, enterprises are at best a hands-on workshop. Some people say that my R D team has hundreds of people. Sorry, do you have much to do with the number of employees at this stage. 2. Industrial realm Knowing that software product design and development is a complex system engineering, many people will try to use some necessary technologies to break down complex systems into

To better elaborate the relationship between software humanized design and technical content, I personally think that we should start from the purpose of developing software. The software we refer to here should be commercial software for the majority of users, the developme

Interactive prototype design software axure Chinese Course--Introduction Introduction (Introduce) An important task for product managers in the Internet industry is to conduct product prototyping (Prototype design). And the most basic work of product prototype design is to combine annotation, a large number of instru

tag library. A tag should inherit from javax. servlet. jsp. tagext. tagsupport and provide the Implementation of dostartag and doendtag methods.Dostartag implements business logicDoendtag control output 6. Service Worker ModeThe page flow, front-end controller mode, and view assistant mode are combined to represent a complete set of processes for "request-forwarding-View. This mode is also the implementation standard of the MVC mode, and Struts is also implemented based on this mode 7. asynchro

author "torture himself: "Have I understood all the customer's needs ?" "Can I determine whether the customer's requirements will not change ?" "Can the software architecture I designed really meet your needs ?" 1.2 Architectural Design Standards This section can be used as a reference for Architecture Design: (1) program organization) (2) Data