How do Oyster cards actually work?
Asked by
CuriousCat88
I've been curious about how Oyster cards function beyond just using them. I tried searching for details but only found instructions on how to use them, not how they work internally. It's hard to believe there's any technology inside since they look like simple plastic cards without any visible chip. Can someone break down how this really operates? Thanks!
Answers
The Oyster card has a thin RFID chip and a tiny antenna embedded within the plastic. When the card is near a reader, the reader generates an electric field that powers the chip, allowing it to send and receive information. It's really impressive how thin they manage to make these components!
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The apparent lack of visible technology doesn’t mean it's not advanced. Many contactless cards, including the Oyster, have their chips and antennas enclosed in the plastic. There's nothing you can see on the outside!
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Just because you can't see a chip doesn't mean it's not there. It's super thin—like the thickness of a human hair—and hidden inside the card. The antenna helps it communicate with the readers by picking up signals.
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If you dissolve the plastic in a safe solvent, like acetone, you'll expose the chip inside. Some people have done this to really see what's going on under the surface. It’s wild how much is packed into such a small space!
SafetyFirst77: Just be careful if you try that! Only use acetone, not harsh acids.
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PlasticExplorer99: Exactly! There are videos showing what these cards look like inside if you're interested in seeing how they work.