1.3.3 Input Devices

• describe the principles of operation (how each device works) of a range of input devices
including 2D and 3D scanners, barcode readers, digital cameras, keyboards, mice, touch screens,
microphones
• describe how these principles are applied to real-life scenarios, for example: scanning of
passports at airports, barcode readers at supermarket checkouts, and touch screens on mobile
devices
• describe how a range of sensors can be used to input data into a computer system, including
light, temperature, magnetic field, gas, pressure, moisture, humidity, pH/acidity/alkalinity and
motion/infra-red
• describe how these sensors are used in real-life scenarios, for example: street lights, security
devices, pollution control, games, and household and industrial applications