S.N.COLLEGE , GADHINGLAJInvention of Mouse• Douglas C. Engelbartinvented several interactive, user-friendly device such as the computer mouse, windows, computer video teleconferencing, hypermedia, GroupWare, email, the Internet and more.• In 1964, the first prototype computer mouse was made to use with a Graphical User Interface (GUI), windows.
S.N.COLLEGE , GADHINGLAJInvention of Mouse• Engel Bart received a patent for the wooden shell with two metal wheels (computer mouse) in 1970, describing it in the patent application as an "X-Y position indicator for a display system."• Mice come in various shapes and sizes and from different manufacturers but the most target manufacturers are Microsoft and Logitech.
S.N.COLLEGE , GADHINGLAJInvention of Mouse• The Mouse consists of different components as follows. –A housing that you hold in your hand and move around on your desktop. –A roller ball that rotates as you move the mouse –Several buttons to make selections. –A cable for connecting mouse to the PC –An interface connector to attach the mouse to the PC
S.N.COLLEGE , GADHINGLAJMouse Interface Types• There are many ways that mice and trackballs are interfaced to a computer which are as follows: –Bus –Serial –PS/2 –USB
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• A ball inside the mouse touches the desktop and rolls when the mouse moves
• The underside of the mouses logic board.• The exposed portion of the ball touches the desktop
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• Two rollers inside the mouse • The following image touch the ball. shows the two white• One of the rollers is oriented so rollers on this mouse that it detects motion in the X direction• The other is oriented 90 degrees to the first roller so it detects motion in the Y direction.• When the ball rolls, one or both of these rollers roll as well.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• The rollers each connect to • The following image a shaft, and the shaft spins shows the disk: a disk with holes in it.• When a roller rolls, its shaft and disk spin.• A typical optical encoding disk.
• This disk has 36 holes around its outer edge.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• On either side of the disk there is an infrared LED and an infrared sensor. The holes in the disk break the beam of light coming from the LED• The infrared sensor then sees pulses of light.• The rate of the pulsing is directly related to the speed of the mouse and the distance it travels.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• A close-up of one of the optical encoders that track mouse motion.
• There is an infrared LED (clear) on one side of the disk and an infrared sensor (red) on the other
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• An on-board processor chip reads the pulses from the infrared sensors and turns them into binary data that the computer can understand.
• The chip sends the binary data to the computer through the mouses cord
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• The logic section of a mouse is dominated by an encoder chip• It’s a small processor that reads the pulses coming from the infrared sensors and turns them into bytes sent to the computer.• Two buttons that detect clicks(on either side of the wire connector).• Almost all mice used on personal computers use this opto mechanical arrangement.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• The disk moves mechanically, and an optical system counts pulses of light.• Each encoder disk has 2 infrared LEDs and 2 infrared sensors, one on each side of the disk (so there are four LED/sensor pairs inside a mouse).• This arrangement allows the processor to detect the disks direction of rotation.• There is a piece of plastic with a small, precisely located hole that sits between the encoder disk and each infrared sensor.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• This piece of plastic provides a window Plastic sheath through which the infrared sensor can "see".
• The window on one side of the disk is located slightly higher than it is on the other• One half the height of one of the holes in the encoder disk, to be exact.
S.N.COLLEGE , GADHINGLAJMechanical Mouse Working• That difference causes the two infrared sensors to see pulses of light at slightly different times.• There are times when one of the sensors will see a pulse of light when the other does not, and vice versa.
S.N.COLLEGE , GADHINGLAJOptical Mouse• Early mice made by Mouse Systems and a few other vendors used a sensor that required a special grid-marked pad and the need to use them with a pad caused them to fall out of favor.• Microsofts IntelliMouse Explorer pioneered the return of optical mice using optical technology to detect movement, and it has no moving parts itself (except for the scroll wheel and buttons on top).
S.N.COLLEGE , GADHINGLAJOptical Mouse• Done by upgrading the optical sensor from the simple type used in older optical mice to a more advanced CCD (charge coupled device) which essentially is a crude version of a video camera sensor that detects movement by seeing the surface move under the mouse.• Versatility and low maintenance make optical mice an attractive choice and the variety of models available from both vendors means you can have the latest optical technology for about the price of a good ball-type mouse.
S.N.COLLEGE , GADHINGLAJTrackball• A trackball is comparable to a mechanical mouse in operation.• In the trackball, instead of moving the mouse to roll the ball, you actually roll the ball yourself with your hand.• Ball’s motion is translated into motion in the X -direction and the Y-direction, and any movement is transmitted to the PC for processing which is used in Laptop.
S.N.COLLEGE , GADHINGLAJInfrared Wireless Mouse• Most mice are attached to the serial port via a cable, some mice use infrared transmission to send the codes to a receiver that is attached to your serial port.• Infrared mice are cordless in that they do not have a cable that attaches the mouse portion to the serial port.• As the infrared light cannot pass through objects it requires an infrared mouse to be in direct line of sight with the receivingunit connected to the PC.