Lecture Notes: Input Peripheral Devices

Introduction

• Peripheral Device: A device connected to a computer (e.g., mouse, scanner).
• Types of Peripheral Devices:
  • Input
  • Output
  • Storage
• Focus for today: Input Devices

Input Devices

• Function: Send data to the computer.

1. Keyboard

• Consists of keys for text input and software interaction.
• Connection methods: Wired or wireless.
• Laptops have built-in keyboards.
• Shortcuts: Key combinations for commands (e.g., Ctrl + Z for Undo).

2. Pointing Devices

• Mouse:
  • Uses an optical sensor for movement recognition.
  • Sensitivity affected by the surface (mouse pad recommended).
• Tracker Ball:
  • Rolled to move the pointer.
  • No buttons.
• Trackpad:
  • Found on laptops.
  • Senses finger movements, presses, and touches.
• Joystick:
  • Found on game controllers.
  • Used for moving sprites in games.

3. Graphics Tablet

• Used with a stylus.
• Popular among digital artists and designers for drawing and writing.

4. Scanner

• Uses light sensors to digitize physical documents.
• OCR (Optical Character Recognition): Reads characters and stores as text.
• OMR (Optical Mark Recognition): Detects marks on documents (e.g., multiple choice questions).

5. Barcode Scanner

• Barcode: Pattern of lines and gaps for tracking parcels.
• Types:
  • Linear Codes: Common in supermarkets.
  • Matrix Codes (QR Codes):
    • Can store more information.
    • Scannable from any angle.

6. Webcam

• Specialized camera often with inbuilt microphone.
• Uses: Security and streaming images/videos online.

7. Microphone

• Captures sound using a diaphragm.
• Converts analog signals to digital via sound card.

Conclusion

• Summary of input devices covered.
• Encouragement to like and subscribe if the lecture was enjoyable.