External Hardware
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How does a digital camera work
• Shutter opens and lets light in • Light focussed onto a sensor • Sensor stores pixels • Light is converted into electrons & the amount of charge is stored • Data stored on flash memory which uses programmable ROM • Data can be manipulated
What does a digital camera store
Still & moving images in digital form (binary)
What is an advantage of a digital camera
It can be processed further
What does rgb mean
Cameras will either have three sensors or three filters
Where is data stored in a digital camera
Compressed files Or RAW (uncompressed) files
How does a bar code scanner work
• LED or laser passed over image • Light sensor used to measure intensity of reflected light, converted into a current • White reflects most & black reflects least • Analogue converted to digital
What is the term when the light intensity measure is converted into a current
Waveform
Is waveform analogue or digital
Analogue
What does RFID stand for
Radio frequency identification
What device is used for RFID
Tags
What might a tag contain
Chip Antennae Battery
What do chips do
Contains data about the item & a modem to modulate and demodulate radio signals
What do antennas do
Sends and receives signals
Active tags
Have a small battery
Passive tags
Pick up electromagnetic power when in range of an RFID reader