1 KEYBOARD. 2 Structure  Is standard input device Arrangement of keys IC Integrated Circuit.

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Presentation transcript:

1 KEYBOARD

2 Structure  Is standard input device Arrangement of keys IC Integrated Circuit

3 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

4 Operators Key11-bit binaryASCII code A S D F G H Bit Binary ASCII code Compiler Character

5 Keyboard types  XT keyboard with 83 key.

6 Keyboard types  AT keyboard with 84 key.

7 Keyboard types  ATX keyboard with 101 -> 104 key. To connector PS2 port.

8 Keyboard types  And other types...

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

10  Mini DIN 6 pin, used more popular with PS/2 connector.  USB connector.  Infrad keyboard. None

11 MOUSE

12  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 13

14  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.

15 Optical Mouse  Structure Emitting diodes

16 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.