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This lesson covers the main input devices required by the OCR H446 specification. For each device, you must understand how it works, what it is used for, and its advantages and disadvantages.
An input device is any hardware that allows a user (or the environment) to enter data or instructions into a computer system. The data is converted into a digital form the computer can process.
| Type | Mechanism |
|---|---|
| Membrane keyboard | A pressure pad under each key completes a circuit when pressed. Cheaper, quieter, less tactile |
| Mechanical keyboard | Each key has an individual switch mechanism. When pressed, the switch closes a circuit. More tactile, more durable |
| Capacitive keyboard | Pressing a key changes the capacitance of a circuit beneath it. No physical contact needed. Used in some premium keyboards |
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