Input/output device functions Page 34

Input/output device functions Page 34

1. LED lights

   • Output
     • LED lights are often used as output indicators from a control system.

2. Actuator

   • Output
     • Actuators are widely used as outputs from a control system, for example, it contains a motor and linkage to lift a car park barrier.

3. ·

4. Webcam

   • Input
     • Digital image captured and input into system for use in on-screen display or video conferencing.

5. Touch screen

   • Input & Output
     • Used commonly on smart phones, tablets, and interactive whiteboards, touch screens are used by tapping on the screen or making gestures.