Examining Input Devices

Computer ConceptsUnit B

Examining Input Devices

• Give examples of input devices:• Keyboard, the primary input device• Pointing device– Mouse– Touchpad– Track pad– Touch screen

Examining Input Devices

• Are all keyboards the same?– Most keyboards are similar.– A computer keyboard includes the basic typing

keypad with keys or buttons with letters and numbers.

Examining Input Devices

• How can I use the keyboard to move around the screen?• Desktop and notebook computer keyboards include a

navigation keypad– Home– End– Arrow keys

• You use these keys to move the insertion point (cursor) on the screen

• Insertion point: flashing vertical bar on the screen.

Examining Input Devices

• Why do I need a mouse?– A mouse allows you to control an on-screen

pointer and perform other screen-based graphical controls

– Mouse is the primary pointing device.Scroll wheel Right mouse

buttonLeft mouse

button

Additional Buttons

Examining Input Devices

• Do all mice use the same technology?– Wired mouse– Wireless mouse

Examining Input Devices

• Do all mice use the same technology?– Optical mouse: uses an LED ( an electronic light)– Laser mouse: uses laser as the light source to

track movement.

Examining Input Devices

• What other pointing devices can I use?– Trackballs: is a roller ball on the top of a mouse,

you use your fingers or the palm of your hand to roll the ball and move the pointer.

– Touchpad: also called track-pad, it is a touch-sensitive surface on which you can slide your fingers to move the on-screen pointer.

Examining Input Devices

• Why do some computers have touch screen?– PDAs– Tablet computers– Retail cash register– Information kiosks

• Touch screen technology: can interpret a single touch or more complex input, such as handwriting>>> need special software

Examining Input Devices

• What if I want to input a drawings made by hand or in a magazine article?– Use scanner to capture the data and create a

digital file in one of the acceptable graphic file format.

Examining Input Devices

• Can I enter data by speaking?– Microphone: is an input device that converts

spoken words or sounds information into a digital format.

Examining Input Devices

• Are digital cameras input devices?Yes

– Digital camera captures images– Digital video camera captures moving images and

sound

Thank you

• Questions !!!