Week 4 - Input and Output Devices
Keyboards
- Input device for entering characters at cursor location.
- Can be wired or wireless.
- Contains: alphanumeric keys, numeric keypad, function keys, delete/backspace keys, control/alternate keys, and arrow keys.
Pointing Devices
- Used for selection and manipulation of objects.
- Common types include: mouse, pen/stylus, touch screen.
Mouse
- Slides on flat surface to move pointer and click.
- Types: mechanical, optical, laser, 3D, wireless.
Pen/Stylus
- Used for electronic writing/drawing; can convert handwriting to digital text.
Touch Screens
- Can be used on desktops, mobile devices, and kiosks; supports multi-touch.
Scanners, Readers, and Digital Cameras
- Input data from physical documents (source data automation).
Scanners
- Capture images and convert to digital form.
- Types: flatbed, portable, 3D, integrated. Quality measured in dpi.
Barcode Readers
- Read barcodes for data representation.
RFID Readers
- Read data from RFID tags for application in inventory tracking, security, etc.
OMR and OCR Devices
- OMR reads data from forms; OCR converts scanned text to editable format.
MICR Readers
- Read magnetic characters, primarily used in banking.
Biometric Readers
- Input unique physiological traits for access control and verification.
Digital Cameras
- Record images on digital media; measured in megapixels.
- Different types include digital still, video cameras, PC webcams.
- Audio Input: Entering audio via microphone; applications in VoIP, podcasts.
- Audio Output: Speakers, headphones, earbuds for voice/music sounds.
Display Devices
- Present visual output.
- Types: LCD, LED, plasma, IMOD.
Printers
- Produce hard copy outputs.
- Characteristics include technology types (laser vs. ink-jet), speed, resolution, connection methods, and multifunction capabilities.
Laser Printers
- Use toner and similar to photocopiers; faster and higher quality than ink-jet.
Ink-Jet Printers
- Spray ink onto paper; typically slower with varying quality.
Special-Purpose Printers
- Includes photo, barcode, portable, plotters, wide-format, and 3D printers.
Summary
- Review of: Keyboards, Pointing Devices, Scanners, Audio Input/Output, Display Devices, Printers.