Notes for A3.4.7 Input devices and sensors - IB | RevisionDojo
A3.4.7 Input devices and sensors Notes
Input Devices
Definition
Input
What is put into a system
Input devices detect changes in the environment and send signals into an electronic system.
They act as the system’s “senses,” triggering a process or output.
Types of Input Devices
Analogue Input Devices
Produce continuous signals that vary over time.
Examples: Temperature sensors, light sensors.
Digital Input Devices
Produce discrete signals, often in the form of binary data (0s and 1s).
Examples: Switches, digital microphones.
Note
Analogue signals are continuous and can take any value within a range, while digital signals are discrete and represent data in binary form.
Switches
Purpose: Turn a circuit on or off manually or mechanically.
Functionality:
When a switch is closed, it completes the circuit, allowing current to flow.
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What is the difference between analogue and digital input devices?
