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KEYBOARD

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Structure

Is standard input device

Arrangement of keys

ICIntegrated

Circuit

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Operators

Each button on the keyboard corresponding to a switch connected between a row of A and a column of B, so each key has a row and column addresses only.

When done press any key, this key will create 11-bit binary code sent to the operating system then it will change to the ASCII code and display on the screen

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Operators

Key 11-bit binary ASCII code

A 0001 1110 0100 0001

S 0001 1111 0101 0011

D 0010 0000 0100 0100

F 0010 0001 0100 0110

G 0010 0010 0100 0111

H 0010 0011 0100 1000

Bit Binary ASCII code

Compiler

Character

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Keyboard types

XT keyboard with 83 key.

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Keyboard types

AT keyboard with 84 key.

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Keyboard types

ATX keyboard with 101 -> 104 key. To connector PS2 port.

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Keyboard types

And other types...

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Connectors

DIN connector have 5 pin. Common used to mainboards support AT connector.

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Mini DIN 6 pin, used more popular with PS/2 connector.

USB connector. Infrad keyboard.

None

None

11

MOUSE

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Mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface

It sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations

Types: Wheels mouse. Optical mouse.

Wheels mouse

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Operations Inside the mouse ball with a rubber ball with plastic spleen in

two axes placed at right angles to each other, while moving the mouse, the ball rotation => make the rotation axis, two axes are attached to plastic gears plastic perforated, each gear is placed between a emitting diodes and a optical sensor.

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Optical Mouse

Structure

Emitting diodes

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Nguyên tắc hoạt động

Emitting diodes create a red light shone onto the surface of the mouse pad, image of the surface panels are lens focused onto optical sensors, optical sensors will analyze the shift of this image => create electrical signals sent to the computer.

Emitting diodes have 2 level• Low level: Diode provided electric

around 0.3V after about 3 seconds time in sleep mode.

• High level: Diode provided electric around 2.2V in active mode.