Douglas Carl Engelbart (January 30, 1925 to July 2,2013)

Douglas Carl Engelbart (January 30, 1925 – July 2, 2013) was an American engineer and inventor, and an early computer and Internet pioneer. He is best known for his work on founding the field of human–computer interaction, particularly while at his Augmentation Research Center Lab in SRI International, which resulted in the invention of the computer mouse, and the development of hypertext, networked computers, and precursors to graphical user interfaces. These were demonstrated at The Mother of All Demos in 1968. Engelbart’s Law, the observation that the intrinsic rate of human performance is exponential, is named after him.


A Computer Mouse

In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user’s hands, with one or more buttons.
The mouse sometimes features other elements, such as “wheels”, which allow the user to perform various system-dependent operations, or extra buttons or features that can add more control or dimensional input. The mouse’s motion typically translates into the motion of a pointer on a display, which allows for fine control of a graphical user interface

Types of MOUSE:

In General, There are only 4 Types of Mouse:

  1. Mechanical Mouse.
  2. Opto-Mechanical Mouse.
  3. Optical Mouse.
  4. Wireless Mouse.

Lets see them all in detail.

01:Mechanical Mouse:

Mechanical Mouse.

A mechanical mouse is a computer mouse that contains a metal or rubber ball on its under side. When the ball is rolled in any direction, sensors inside the mouse detect this motion and move the on-screen mouse pointer in the same direction. It was made by German company Telefunken which was published on their early ball mouse on October 2, 1968.

02:Opto-Mechanical Mouse:

Opto-Mechanical Mouse.

The optical-mechanical or Optomechanical mouse consists of a ball that rolls one of two wheels inside the mouse. Each wheel contains a circle of holes or notches, which allow a LED light to be shined through and detected by a sensor, as the wheel spins they represent an X or Y axis for the mouse pointer on your screen. This mouse is much more accurate than a mechanical mouse that used only wheels and rollers, however, is not as good as an optical mouse.

03:Optical Mouse:

Optical Mouse.

An optical computer mouse uses a light-emitting diode and photodiodes to detect movement relative to a surface, unlike a mechanical mouse which has a ball which rotates orthogonal shafts which drive chopper wheels for distance measurement.
The earliest optical mice detected movement on pre-printed mousepad surfaces, whereas the modern optical mouse works on most opaque surfaces; it is usually unable to detect movement on specular surfaces like glass, although some advanced models can function even on clear glass. Laser diodes are also used for better resolution and precision.

04:Wireless Mouse:

Wireless Mouse.

Cordless or wireless mice transmit data via infrared radiation (see IrDA) or radio (including Bluetooth and WiFi). The receiver is connected to the computer through a serial or USB port, or can be built in (as is sometimes the case with Bluetooth and WiFi[54]). Modern non-Bluetooth and non-WiFi wireless mice use USB receivers. Some of these can be stored inside the mouse for safe transport while not in use, while other, newer mice use newer “nano” receivers, designed to be small enough to remain plugged into a laptop during transport, while still being large enough to easily remove.

Advantages of a Mouse:

The Advantages of a Mouse are as Follows:

A mouse works very well for navigating a graphical user interface, such as Windows or Mac. With additional buttons and a scroll wheel, increasingly complex functions can be done from a mouse. These include opening, closing and minimizing software; grouping, moving and deleting files; and even image editing with software like Photoshop.In my experience, a mouse is better for fine movements and adjustments than most of the alternatives.

Disadvantages of a Mouse:

The Disadvantages of a Mouse are as Follows:

An external mouse requires space, making it nearly impossible to use on an airplane. A mechanical mouse needs to be cleaned regularly or it will get clogged with lint and dust. The cord on most mice can get hung up and drag, making the mouse difficult to use.

Connection of Mouse by its Different Ports:

There are several different types of ports which uses the interface you need to connect your mouse within different PC-OS, they are as follows:
01) PS/2 Port, 02) Serial Port, 03) USB Port.

Lets see them all in detail.

01) PS/2 Port:

FIG 01: PS/2 Port.

PS/2 ports were the previous standard before USB for keyboards and mice.
They were no faster than Serial ports (see below) but were primarily created to help users by assigning a different shape to the port used for your mouse.
The technical term for the PS/2 keyboard interface is a Mini-DIN 6 plug (which replaced the previous standard which was the DIN 5 plug, known as the AT connector).
The Mini-DIN 6 plug for the mouse replaced the 9 pin Serial port connector .
Most computers manufactured prior to 2006 came with 2 PS/2 ports, a purple one for the keyboard and a green one for the mouse.
Computers built more recently typically no longer have PS/2 ports on them, although some manufacturers are still supporting this standard, as there is no loss of performance in using a PS/2 interface for keyboards and mice.

02) Serial Port:

FIG 02: Serial Port.

A port, or interface, that can be used for serial communication, in which only 1 bit is transmitted at a time is called as Serial Ports.
Most serial ports on personal computers conform to the RS-232C or RS-422 standards.
A serial port is a general-purpose interface that can be used for almost any type of device, including modems, mice, and printers (although most printers are connected to a parallel port).


FIG 03: USB Port.

IT is the most common type of interface and has become the standard interface on all current computers, whether they are on a PC (i.e. Windows) or Mac (OS 9, OS X) platform.
Most computers come with at least 4 USB ports built into the computer, and many of them have additional ports on the front of the computer (Front Side USB ports).
There are two types of USB ports which look physically identical: 1) USB 1.1 and 2) USB 2.0.
USB 1.1 was the previous standard and is all you need for any keyboard or mousing device.