Getting Started with Arduino

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What is Arduino?

Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board. To do so you use the Arduino programming language (based on Wiring), and the Arduino Software (IDE) , based on Processing.
Click the link below to get more info.
https://www.arduino.cc/en/Guide/Introduction

Getting Started with Arduino and Genuino products

The Arduino Platform

Arduino is composed of two major parts: the Arduino board, which is the piece of hardware you work on when you build your objects; and the Arduino IDE, the piece of software you run on your computer. You use the IDE to create a sketch (a little computer program) that you upload to the Arduino board. The sketch tells the board what to do.

Not too long ago, working on hardware meant building circuits from scratch, using hundreds of different components with strange names like resistor, capacitor,LED, transistor, and so on. Every circuit was "wired" to do one specific application, and making changes required you to cut wires, solder connections, and more.

With the appearance of digital technologies and microprocessors, these functions, which were once implemented with wires, were replaced by software programs. Software is easier to modify than hardware. With a few keypresses, you can radically change the logic of a device and try two or three versions in the same amount of time that it would take you to solder a couple of resistors.

The Arduino Hardware

The Arduino board is a small microcontroller board,which is a small circuit (the board) that contains a whole computer on a small chip (the microcontroller). It is a lot cheaper and very useful to build interesting devices.

In those illustrations, you see the Arduino board. At first,all those connectors might be a little confusing. Here is an explanation of what every element of the board does: