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Inside the tiny chip that powers Montreal subway tickets (www.righto.com)

submitted 4 months ago by [email protected] to c/[email protected]

8 comments fedilink hide all child comments

To use the Montreal subway (the Métro), you tap a paper ticket against the turnstile and it opens. The ticket works through a system called NFC, but what's happening internally? How does the ticket work without a battery? How does it communicate with the turnstile? And how can it be so cheap that you can throw the ticket away after one use? To answer these questions, I opened up a ticket and examined the tiny chip inside.

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[–] [email protected] 29 points 4 months ago (1 children)

Here is a link to the Mastadon post where I saw this first, since this link is showing as non-secure.

https://mastodon.world/@[email protected]/112666771797972297

[–] [email protected] 7 points 4 months ago (1 children)

Thank you for the link! Always had only a vague understand of NFC communication.

[–] [email protected] 3 points 4 months ago

Yeah, really appreciated that thorough breakdown!