The circuit: * LED attached from pin 5 to ground through a 1K resistor * pushbutton attached to pin 13 from +5V * 10K resistor attached to pin 13 from ground //= EG LABS =*/ // constants won't change. *= EG LABS = Turns on and off a light emitting diode(LED) connected to digital pin 5, when pressing a pushbutton attached to pin 13. In this article, we shall discuss the various input and output devices which can be connected to a computer, along with their functions. Using an input device we can give instructions to the computer to perform an action and the device reverts to our action through an output device. Projector - A device that is used to project video output from the computer onto a wall or screen. It is assumed that the reader has gone through the project Getting started with arduino and done all the things discussed in it. The functioning of a computer system is based on the combined usage of both input and output devices. Speaker - Converts digital signals into audible sound waves. This article explains how to use the digital input and output of the arduino board with the help of a simple push button as a digital input device and a LED as a digital output device. The arduino boards can communicate with other devices using digital input/output analog input/output standard communication ports like USART, IIC, and USB etc.

It is through these inputs and outputs that the arduino as a system can communicate with the environment. Since the arduino board can act as a stand-alone system it should have capabilities to take inputs process the input and then generate a corresponding output. When it comes to programming the arduino board anyone who have basic knowledge of c programming can quickly get started with the arduino IDE. Both digital and analog inputs and outputs are available in all arduino boards.

The arduino can be used as a stand-alone board of which the output or inputs can be taken from the boards or given to the board using convenient connectors. Any AVR microcontroller based board which follows the standard arduino schematic and is flashed with the arduino boot-loader can be called an arduino board. There is no other tool available which helps in easy prototyping like the arduino does.

Project on input and output devices