Input devices presentation

In this slides the topic of input devices is covered very easy format and the students of computer science department also help this file

1. Input devices M.tayyab hussain BSIT(session 2015-2019 ) Superior university Lahore ( okara campus)

2. Input devices An input device is a piece of hardware that is used to enter data into a computer .  

3. List of input devices: Keyboard. Mouse. Touchpad. Joystick. Touch screen. Scanner. Graphics tablet. Micro phone. Digital camera.

4. Keyboard A keyboard is an input device that allows a person to enter symbols like letters and numbers into a computer. It is the main input device for most computers. There are different types of keyboards. The most popular type is the QWERTY design such as typewriter keyboards .

5. keyboard Laptop-size Handheld Multifunctional: Common environments for multifunctional keyboards are complex, high-performance workplaces for  financial traders  and  control room  operators (emergency services, security, air traffic management; industry, utilities management, etc.).

6. Mouse A computer mouse is an input device that is most often used with a personal computer . Moving a mouse along a flat surface can move the on-screen cursor to different items on the screen.

7. Mouse Optical and laser mice The earliest optical mice detected movement on pre-printed mouse pad surfaces, whereas the modern LED optical mouse works on most opaque diffuse surfaces; it is usually unable to detect movement on specular surfaces like polished stone. Laser diodes are also used for better resolution and precision, improving performance on opaque specular surfaces. Battery powered, wireless optical mice flash the LED intermittently to save power , and only glow steadily when movement is detected. 3D mice: USB ,Cordless or wireless :

8. Touchpad A touch pad is a device for pointing (controlling input positioning) on a computer display screen. It is an alternative to the mouse . Originally incorporated in laptop computers, touch pads are also being made for use with desktop computers. A touch pad works by sensing the user's finger movement and downward pressure. several layers of material. top layer touch. electrode layers.

9. Joystick A joystick is an input device that allows the user to control a character or machine in a computer program, such as a plane in a flight simulator. control video games. Other common input devices are joysticks, bar code readers, cameras, fingerprint readers etc.

10. Touch screen A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure ; a user interacts with the computer by touching pictures or words on the screen. Resistive : A resistive touch screen panel is coated with a thin metallic electrically conductive and resistive layer that causes a change in the electrical current which is registered as a touch event and sent to the controller for processing . Surface wave: ultrasonic waves registers Capacitive  : Electrical charge

11. Scanner A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Drum scanner: One of the unique features of drum scanners is the ability to control sample area and aperture size independently . The sample size is the area that the scanner encoder reads to create an individual pixel. The aperture is the actual opening that allows light into the optical bench of the scanner. The ability to control aperture and sample size separately is particularly useful for smoothing film grain when scanning black-and-white and color negative originals CCD scanner :

12. Graphic tablet A  graphics tablet  or digitizer is a computer input device that enables a user to hand-draw images, animations and  graphics , similar to the way a person draws images with a pencil and paper . These  tablets  may also be used to capture data or handwritten signatures. Optical tablets: Optical tablets operate by a very small digital camera in the stylus