Year: 2018

(MMV) Reference · ESP8266 Arduino Core

Jovan Stosic March 3, 2018

Timing and delays

millis() and micros() return the number of milliseconds and microseconds elapsed after reset, respectively.

delay(ms) pauses the sketch for a given number of milliseconds and allows WiFi and TCP/IP tasks to run. delayMicroseconds(us) pauses for a given number of microseconds.

Remember that there is a lot of code that needs to run on the chip besides the sketch when WiFi is connected. WiFi and TCP/IP libraries get a chance to handle any pending events each time the loop() function completes, OR when delay is called. If you have a loop somewhere in your sketch that takes a lot of time (>50ms) without calling delay, you might consider adding a call to delay function to keep the WiFi stack running smoothly.

There is also a yield() function which is equivalent to delay(0). ThedelayMicroseconds function, on the other hand, does not yield to other tasks, so using it for delays more than 20 milliseconds is not recommended.

Source: Reference · ESP8266 Arduino Core

Ship gun fire-control system – Wikipedia

Jovan Stosic March 2, 2018

Ship gun fire-control systems (GFCS) are fire-control systems to enable remote and automatic targeting of guns against surface ships, aircraft, and shore targets, with either optical or radar sighting.

Most US ships that are destroyers or larger (but not destroyer escorts or escort carriers) employed GFCS for 5 -inch and larger guns, up to battleships, such as the USS Iowa. Beginning with ships built in the 1960s, GFCSs were integrated with missile fire-control systems and other ship sensors.

The major components of a GFCS are a manned director, with or replaced by radar or television camera, a computer, stabilizing device or gyro, and equipment in a plotting room[1]

For the USN, the most prevalent gunnery computer was the Ford Mark 1, later the Mark 1A Fire Control Computer, which was an electro-mechanical analog ballistic computer that provided accurate firing solutions and could automatically control one or more gun mounts against stationary or moving targets on the surface or in the air. This gave American forces a technological advantage in World War II against the Japanese who did not develop Remote Power Control for their guns; both the USN and IJN used visual correction of shots using shell splashes or air bursts, while the USN augmented visual spotting with Radar. Digital computers would not be adopted for this purpose by the US until the mid-1970s; however, it must be emphasized that all analog anti-aircraft fire control systems had severe limitations, and even the USN Mk 37 system required nearly 1000 rounds of 5″ mechanical fuze ammunition per kill, even in late 1944.[2]

The MK 37 Gun Fire Control System incorporated the Mk 1 computer, the Mk 37 director, a gyroscopic stable element along with automatic gun control, and was the first USN dual purpose GFCS to separate the computer from the director.

Source: Ship gun fire-control system – Wikipedia

Adobe AIR – Wikipedia

Jovan Stosic March 1, 2018

Adobe AIR (formerly Adobe Integrated Runtime) is a cross-platform runtime system developed by Adobe Systems for building desktop applications and mobile applications, programmed using Adobe Flash, ActionScript and optionally Apache Flex. The runtime supports installable applications on Windows, OS X and mobile operating systems including Android, iOS and BlackBerry Tablet OS. It also originally ran on Linux, but support was discontinued as of version 2.6 in 2011.

Source: Adobe AIR – Wikipedia

Model–view–controller – Wikipedia

Jovan Stosic March 1, 2018

Model–view–controller (MVC) is an architectural pattern commonly used for developing user interfaces that divides an application into three interconnected parts. This is done to separate internal representations of information from the ways information is presented to and accepted from the user. The MVC design pattern decouples these major components allowing for efficient code reuse and parallel development.

Traditionally used for desktop graphical user interfaces (GUIs), this architecture has become popular for designing web applications and even mobile, desktop and other clients. Popular programming languages like Java, C#, Ruby, PHP and others have popular MVC frameworks that are currently being used in web application development straight out of the box.

Source: Model–view–controller – Wikipedia

Node.js – Wikipedia

Jovan Stosic March 1, 2018

Node.js is an open-source, cross-platform JavaScript run-time environment for executing JavaScript code server-side. Historically, JavaScript was used primarily for client-side scripting, in which scripts written in JavaScript are embedded in a webpage’s HTML, to be run client-side by a JavaScript engine in the user’s web browser. Node.js enables JavaScript to be used for server-side scripting, and runs scripts server-side to produce dynamic web page content before the page is sent to the user’s web browser. Consequently, Node.js has become one of the foundational elements of the “JavaScript everywhere” paradigm,[5] allowing web application development to unify around a single programming language, rather than rely on a different language for writing server side scripts.

Though .js is the conventional filename extension for JavaScript code, the name “Node.js” does not refer to a particular file in this context and is merely the name of the product. Node.js has an event-driven architecture capable of asynchronous I/O. These design choices aim to optimize throughput and scalability in Web applications with many input/output operations, as well as for real-time Web applications (e.g., real-time communication programs and browser games).[6]

The Node.js distributed development project, governed by the Node.js Foundation,[7] is facilitated by the Linux Foundation’s Collaborative Projects program.[8]

Corporate users of Node.js software include GoDaddy,[9] Groupon,[10] IBM,[11] LinkedIn,[12][13] Microsoft,[14][15] Netflix,[16] PayPal,[17][18] Rakuten, SAP, Tuenti,[19] Voxer,[20] Walmart,[21] and Yahoo!.[22]

Source: Node.js – Wikipedia