Mouse • The computer mouse is considered an input device. • With a click of a button, the mouse sends information to the computer. • • It looks like real mouse with the cord is the tail and the part we hold is the body. types • Mechanical • Opto-mechanical • Optical Basic parts of a mouse • • • • • A ball two rollers An LED and a sensor On board processor chip A shaft Optical Mouse • Developed by Agilent technologies in 1999 • Uses a camera that take 1500 pictures every second • Working: • Optical mouse has a small and red lightemitting diode (LED) • It bounces light off the surface onto a (complimentary metal oxide semiconductor) CMOS sensor. • The CMOS sensor sends each image to a digital signal processor for analysis • DSP is able to detect patterns in the images and it checks how the pattern is moved with respect to the previous one • Based on the change , the DSP determines how far the mouse has moved and sends the co-ordinates to the computer • The computer moves the cursor on the screen based on the coordinates received from the mouse. • This happens hundreds of times each second, making the cursor appear to move very smoothly. Advantages • 1.Able to work on almost any surface • 2.No moving parts means less wear and a lower chance of failure • 3.There's no way for dirt to get inside the mouse and interfere with the tracking sensors. • 4.Increased tracking resolution means smoother response. • 5.They don't require a special surface, such as a mouse pad connectors • • • • Serial PS/2 USB wireless serial • The serial mouse was connected to the computer via the serial port. • A serial port is a physical communication interface through which information is transferred in and out of the computer bit by bit. • The serial port is a D-type 9 pin male port (DB9M) at the back of the motherboard. Its corresponding connector must then be a female connector for them to mate correctly. • The serial mouse is obsolete. PS/2 mouse • The PS/2 mouse is connected to the PS/2 port (green in colour). • The PS/2 mouse connector is a 6-pin mini-din connector designed in 1987. • It superseded the serial connectors. Its name is derived from IBM's personal systems/2 series of personal computers, which were introduced in 1987. USB mouse • The physical shape and appearance of the USB mouse are similar to the others. • The only difference is the connector that connects to a USB port on the back of your PC. • The USB port also provides power to the attached device hence eliminating the need for power connectors. • The USB ports support hot-plugging where you connect or remove a device without turning off your computer. Wireless mouse • This is the latest type of mouse that does not use a cable to connect to the back of your computer. • It is a neat type of mouse to use because it eliminates the clutter of cables on your desktop. • wireless mice use radio frequency (RF) technology to send information to computer. • Radio Frequency devices require two main components in order to communicate; a transmitter and a receiver. • The transmitter is housed in the mouse and it is powered by a battery that will be found on the underside of the mouse compartment. • The transmitter sends an electromagnetic (radio) signal that encodes the information about the mouse's movements and the buttons you click. • On the other hand, there is a receiver connected to your computer. • It accepts the signal, decodes it and passes it on to the mouse driver software and your computer's operating system. • • • • • Features: Comfortable Ergonomic Design Save Battery Life Plug and play -no need for any drivers Wide Compatibility