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Develop a Digital Clock

In this article by Samarth Shah , author of the book  Learning Raspberry Pi ,we will take your Raspberry Pi to the real world. Make sure you have all the components listed for you to go ahead: Raspberry Pi with Raspbian OS. A keyboard/mouse. A monitor to display the content of Raspberry Pi. If you don't have Raspberry Pi, you can install the VNC server on Raspberry Pi, and on your laptop using the VNC viewer, you will be able to display the content. Hook up wires of different colors (keep around 30 wires of around 10 cm long). To do: Read instructions on how to cut the wires. An HD44780-based LCD. Note; I have used JHD162A. A breadboard. 10K potentiometer (optional). You will be using potentiometer to control the contrast of the LCD, so if you don't have potentiometer, contrast would be fixed and that would be okay for this project. Potentiometer is just a fancy word used for variable resistor. Basically, it is just a three-terminal resistor with sliding or rotating contact, which is used for changing the value of the resistor.

Designing Jasmine Tests with Spies

In this article by Munish Sethi , author of the book Jasmine Cookbook , we will see the implementation of Jasmine tests using spies.

Constructing Common UI Widgets

One of the biggest features that draws developers to Ext JS is the vast array of UI widgets available out of the box. The ease with which they can be integrated with each other and the attractive and consistent visuals each of them offers is also a big attraction. No other framework can compete on this front, and this is a huge reason Ext JS leads the field of large-scale web applications. In this article by Stuart Ashworth and Andrew Duncan by authors of the book, Ext JS Essentials , we will look at how UI widgets fit into the framework's structure, how they interact with each other, and how we can retrieve and reference them. We will then delve under the surface and investigate the lifecycle of a component and the stages it will go through during the lifetime of an application.

Static Data Management

 In this article by Loiane Groner , author of the book Mastering Ext JS, Second Edition , we will start implementing the application's core features, starting with static data management. What exactly is this? Every application has information that is not directly related to the core business, but this information is used by the core business logic somehow. There are two types of data in every application: static data and dynamic data. For example, the types of categories, languages, cities, and countries can exist independently of the core business and can be used by the core business information as well; this is what we call static data because it does not change very often. And there is the dynamic data, which is the information that changes in the application, what we call core business data. Clients, orders, and sales would be examples of dynamic or core business data. We can treat this static information as though they are independent MySQL tables (since we are using MySQL as the database server), and we can perform all the actions we can do on a MySQL table.

Arduino Development

Most systems using the Arduino have a similar architecture. They have a way of reading data from the environment—a sensor—they make decision using the code running inside the Arduino and then output those decisions to the environment using various actuators, such as a simple motor. Using three recipes from the book,  Arduino Development Cookbook , by Cornel Amariei , we will build such a system, and quite a useful one—a fan controlled by the air temperature. Let's break the process into three key steps, the first and easiest will be to connect an LED to the Arduino, a few of them will act as a thermometer, displaying the room temperature. The second step will be to connect the sensor and program it, and the third will be to connect the motor. Here, we will learn this basic skills.

Inserting GIS Objects

In this article by Angel Marquez author of the book  PostGIS Essentials see how to insert GIS objects. Now is the time to fill our tables with data. It's very important to understand some of the theoretical concepts about spatial data before we can properly work with it. We will cover this concept through the real estate company example, used previously. Basically, we will insert two kinds of data: firstly, all the data that belongs to our own scope of interest. By this, I mean the spatial data that was generated by us (the positions of properties in the case of the example of the real estate company) for our specific problem, so as to save this data in a way that can be easily exploited. Secondly, we will import data of a more general use, which was provided by a third party. Another important feature that we will cover in this article are the spatial data files that we could use to share, import, and export spatial data within a standardized and popular format called shp or Shape files. In this article, we will cover the following topics: Developing insertion queries that include GIS objects Obtaining useful spatial data from a public third-party Filling our spatial tables with the help of spatial data files using a command line tool Filling our spatial tables with the help of spatial data files using a GUI tool provided by PostGIS

Structure of Applications

In this article by Colin Ramsay , author of the book  Ext JS Application Development Blueprints , we will learn that one of the great things about imposing structure is that it automatically gives predictability (a kind of filing system in which we immediately know where a particular piece of code should live). The same applies to the files that make up your application. Certainly, we could put all of our files in the root of the website, mixing CSS, JavaScript, configuration and HTML files in a long alphabetical list, but we'd be losing out on a number of opportunities to keep our application organized. In this article, we'll look at: Ideas to structure your code The layout of a typical Ext JS application Use of singletons, mixins, and inheritance Why global state is a bad thing Structuring your application is like keeping your house in order. You'll know where to find your car keys, and you'll be prepared for unexpected guests.

Third Party Libraries

In this article by Nathan Rozentals , author of the book Mastering TypeScript , the author believes that our TypeScript development environment would not amount to much if we were not able to reuse the myriad of existing JavaScript libraries, frameworks and general goodness. However, in order to use a particular third party library with TypeScript, we will first need a matching definition file. Soon after TypeScript was released, Boris Yankov set up a github repository to house TypeScript definition files for third party JavaScript libraries. This repository, named DefinitelyTyped ( ) quickly became very popular, and is currently the place to go for high-quality definition files. DefinitelyTyped currently has over 700 definition files, built up over time from hundreds of contributors from all over the world. If we were to measure the success of TypeScript within the JavaScript community, then the DefinitelyTyped repository would be a good indication of how well TypeScript has been adopted. Before you go ahead and try to write your own definition files, check the DefinitelyTyped repository to see if there is one already available. In this article, we will have a closer look at using these definition files, and cover the following topics: Choosing a JavaScript Framework Using TypeScript with Backbone Using TypeScript with Angular

Using networking for distributed computing with openFrameworks

In this article by Denis Perevalov and Igor (Sodazot) Tatarnikov , authors of the book openFrameworks Essentials , we will investigate how to create a distributed project consisting of several programs working together and communicating with each other via networking.

Moving from Foundational to Advanced Visualizations

This article is written by Joshua N. Milligan , the author of Learning Tableau . You are now ready to set out on a journey of building advanced visualizations! "Advanced" does not necessarily mean difficult. Tableau makes many of these visualizations easy to create. Advanced also does not necessarily mean complex. The goal is to communicate the data, not obscure it in needless complexity.

Adding and Editing Content in Your Web Pages

This article by Miko Coffey , the author of the book, Building Business Websites with Squarespace 7 , delves into the processes of adjusting images, adding content to sidebars or footers, and adding links.


Humans are visual creatures and have evolved to be able to quickly notice the meaning when information is presented in certain ways that cause the wiring in our brains to have the light bulb of insight turn on. This "aha" can often be performed very quickly, given the correct tools, instead of through tedious numerical analysis. Tools for data analysis, such as pandas, take advantage of being able to quickly and iteratively provide the user to take data, process it, and quickly visualize the meaning. Often, much of what you will do with pandas is massaging your data to be able to visualize it in one or more visual patterns, in an attempt to get to "aha" by simply glancing at the visual representation of the information. In this article by Michael Heydt , author of the book Learning pandas we will cover common patterns in visualizing data with pandas. It is not meant to be exhaustive in coverage. The goal is to give you the required knowledge to create beautiful data visualizations on pandas data quickly and with very few lines of code.

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