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Post AjDxuKNcbnmiVxfRCa by [email protected] |
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More posts by [email protected] |
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Post #AjDxuJAT7DfYksVQ3s by [email protected] |
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0 likes, 5 repeats |
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To use the Montreal subway, you tap a paper ticket against the turnstile and it… |
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Post #AjDxuJHYgrLB6rp572 by [email protected] |
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0 likes, 1 repeats |
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The Montreal Métro uses this paper ticket for occasional use. The gold chip is… |
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Post #AjDxuJNwJ8RdQeoB3g by [email protected] |
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0 likes, 1 repeats |
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Underneath the paper coating, the subway ticket contains a thin plastic sheet w… |
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Post #AjDxuJUfu5pflXxYYa by [email protected] |
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The chip is about the size of a grain of salt. I took this photo under a micros… |
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Post #AjDxuJahXgeY4EmMwy by [email protected] |
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0 likes, 1 repeats |
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How does the card work without a battery? The reader sends a signal through its… |
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Post #AjDxuJgNCbBqLpQtn6 by [email protected] |
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0 likes, 1 repeats |
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The card doesn't transmit a signal back. Instead it changes its antenna loa… |
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Post #AjDxuJmOqC0ieWFiBU by [email protected] |
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I dissolved the chip's metal and oxide layers to reveal the chip's unde… |
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Post #AjDxuJsmST7AyJEo88 by [email protected] |
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This block diagram from the datasheet shows the components of the card. The RF … |
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Post #AjDxuJzA4kDdI6Du4m by [email protected] |
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Most of the chip is digital logic, implemented with standard-cell circuitry, bu… |
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Post #AjDxuK5BiL2Van2iTA by [email protected] |
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Many chips use standard-cell circuitry. A program converts the logic descriptio… |
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Post #AjDxuKBZKc8xua1oPo by [email protected] |
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The photos are a bit blurry because the chip's smallest features are about … |
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Post #AjDxuKHayCxqDGqcoC by [email protected] |
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Here's a closeup of the EEPROM, which holds the chip's data, similar to… |
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Post #AjDxuKNcbnmiVxfRCa by [email protected] |
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0 likes, 1 repeats |
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My first attempt at removing the protective passivation layer on top of the chi… |
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Post #AjDxuKU0E4tApkeX9E by [email protected] |
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You can buy an 8-inch silicon wafer with these chips for $9000. That sounds exp… |
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Post #AjDxuKaNqLzd9Xdd5s by [email protected] |
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0 likes, 3 repeats |
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For more, see my blog post describing this chip (the MIFARE Ultralight EV1):htt… |
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Post #AjDy4ow9qxd4BIpCHA by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff Incredible, we are in such an advance state that we create microsc… |
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Post #AjDzvpRumNYL4WWEfQ by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff a very similar card has been in use in Porto, Portugal for the sub… |
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Post #AjE2kjQ59lOz353tKq by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff The very best line hidden in a footnote: "Personally, if you … |
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Post #AjE4iG4fUURDMfzgZs by [email protected] |
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@Andres It's not exactly single-use. You can put a 3-day ticket on it. Sing… |
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Post #AjE4iGAh85G5fMoUyG by [email protected] |
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@theohonohan @Andres It’s a slip of paper with a grain of sand in it.This is … |
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Post #AjE4sjYYjQyLhJyDlw by [email protected] |
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@kenshirriff The amazing bit being that they can cut the wafer with that kinda … |
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Post #AjE51ktT84qWS33JTM by [email protected] |
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@kenshirriff I love stuff like this, thanks! |
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Post #AjEAT75NEAI2rtU9tg by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff Is there any information about what the payload is that is stored … |
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Post #AjEChaP3Ds5Rkziaxs by [email protected] |
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0 likes, 1 repeats |
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@Andres @kenshirriff My city uses the same kind of ticket. They can be reloaded… |
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Post #AjEFKl1RsFYFtVU6Ge by [email protected] |
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@[email protected] Still all such a small, delicate yet powerful mecha… |
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Post #AjEGfYIcTOE2TBznAe by [email protected] |
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@kenshirriff I have been negligent in failing to mention how much I appreciate … |
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Post #AjEa12vdgfbMfwD2rA by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff thank you for sharing this fascinating bit of info. Economy of sca… |
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Post #AjEj9gjIUWY61IdGAC by [email protected] |
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0 likes, 1 repeats |
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@marshray @theohonohan @Andres no, it's a slip of metallized polyethylene w… |
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Post #AjFS5GUaavfPQS19qC by [email protected] |
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@kenshirriff The tech is amazing but it still seems wasteful (not w.r.t. money … |
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Post #AjFS5HS91VJ0P9sifY by [email protected] |
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@rauschma @kenshirriff I think you're right, but I also think you could buy… |
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Post #AjFldAj6R8xeWAgiES by [email protected] |
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0 likes, 2 repeats |
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@kenshirriff Okay, it's cheap enough to throw them away, but should it real… |
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Post #AjHCBMvGOFes9iIpRQ by [email protected] |
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0 likes, 1 repeats |
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@kenshirriff This pairs well with a recent discussion by Asiaometry on the orig… |
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Post #AuihuMvR2qdh0PYbi4 by [email protected] |
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@kenshirriff As a Montrealer, I'm so happy to see this on your blog! I'… |
