Input Devices

Input Devices

1. Supplies the CPU with data so the user can instruct the computer to do something – get data to the CPU for processing

2. Household devices

   • Microphone
     • Uses speech and voice recognition systemsto input data
     • Adv: You can use speech to input text or choose menu options
     • Dis: Commands can be difficult to recognise and sound fliles take up a lot of memory
   • Keyboard
     • Uses pressing keys to input the data
     • Adv: You can enter data quickly and is easy to learn to use and understand
     • Dis: It is easy to make mistakes and disables people can find it hard to use
   • Mouse
     • Uses movement to move a cursor on screen
     • Adv: Good for use on a desktop computer and for people in a seated position
     • Dis: Needs a flat clean surface to work
   • Camera
     • Uses gestures to track movement and input data
     • Adv: Users can input data to the system without touching it
     • Dis: It is easy for the devise to misinterpret data and it needs light to work

3. Industrial devices

   • OMR (Optical Mark Recognition) Scanners
     • Uses recognition devices to find marks on a document
     • Adv: It is accurate and is a fast methodof reading data
     • Dis: Thay may not be read completely and is not suitable for text
   • Bar Code Scanner
     • Uses a series of vertical lines with varying widths to scan for data
     • Adv: Its automatic and the price of the item can be changed once on a computer system
     • Dis: Scratched or crumpled barcodes can cause problems and data must be encoded into the system
   • RFID (Radio Frequency Identification)
     • Uses a tag to store data and it transmits the data through radio waves
     • Adv: Efficient as it does not require to be in the line of sight
     • Dis: They are more expensive than barcode systems as they are more complex

4. Specific needs devices

   • Eye Tracker
     • Eye movement moves the cursor toselect options onscreen
     • Adv: Faster than other medias and easy to use
     • Dis: Expensive and some people cant use it
   • Suck Puff Switch
     • Uses mouth and breathing to control a switch
     • Adv: Paralysed users can use it and can use internet
     • Dis: Slow to use and may need to be replaced
   • Foot Mouse
     • Uses the foot instead of hand to control cursor
     • Dis: It is slow and can cause pain in the legs
     • Adv: You can type and move the cursor around at the same time