input devices

input devices

1. keyboard

   • Improper height and angle of the keyboard, mouse, or working surface can cause us to bend our wrists or lift their our for extended periods.A keyboard or mouse that is not directly in front of or close to the body forces us to repeatedly reach during use.

2. Mouse

   • There are two reasons why using a mouse regularly can be hazardous. First, using a mouse requires a person to make small, exact movements with their hand, fingers, and thumb. scrolling and clicking the mouse again and again, the same small muscles can become tired and overworked, which causes Pain (ache, soreness) around the wrist.The second reason is that the placement of the mouse can make it awkward to reach.When the mouse is in this position, it is out of 'easy reach' and In order to use the mouse, the person has to reach their arm outwards and forwards and hold it there unsupported for as long as they are using the mouse.holding your arm like this, again and again throughout the workday can cause soreness and fatique by putting an extra load on the muscles in the upper back and shoulder .

3. Micrphone

   • sometimes wireless microphone can cut out because of signal problems. sound quality may not be the best

4. Bar code reader

   • many times the technology seems to fail.operator error, This can occur when a shop assistant, or customer using the self checkout aisle, scans a product too quickly.Scanners are in fairly constant use and pick up a fair bit of grease and grime. This can lead to performance shortfalls.

5. Joy stick

   • some joysticks are only limited to forward, backward, left and right
     • can cause injury to the wrist

6. Track ball

   • dirt can get under the trackball and you will get problems with the cursor moving freely

7. Optical mark reader

   • If the user wants to gather large amounts of text, then OMR complicates the data collection.There is also the possibility of missing data in the scanning process, and incorrectly or unnumbered pages can lead to their being scanned in the wrong order.

8. Scanner

   • Problems you may have while using the scanner often involve the operation of your software and computer. such as: 1.Incorrect setup of the interface 2.Incorrect setup of your computer or software 3.Incorrect operation of your software

9. Webcam

   • Just as a hacker can gain control of your PC, so they can also take over your webcam, switching it on and off, taking photos and watching everything you do.

10. Drawing tablet

    • one problem with using graphic tablets is found in trying to coordinate the movement of your hand with the action on the screen.and it can be slower then paper drawing