RFID Readers
RFID chips or Radio Interface Identification chips are used to read data without any physical contact being made. A good example of where this system is used is the Oyster Card system in London.
- The card is placed above a reader and the magnetic field created by the reader and the magnetic field produced by the reader creates a current in the card’s circuitry.
- This current powers a small radio transmitter that transmits a radio wave with the details about the card to the reader
- If the details of the card are legitimate (checked on database) then it lets the person though the gate
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Pros |
Cons |
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Can be read without physical contact |
Easy to be read remotely so thieves could steal your information. |
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Fast way to pay for things |
Having multiple RFID cards could cause interference and as such no card would be able to be read. |
Source: https://en.wikibooks.org/wiki/A-level_Computing/AQA/Print_version/Unit_2#RFID_reader