[Lab] Removing chip from presto card

Jason Cobill jason.cobill at gmail.com
Thu Mar 3 20:34:29 EST 2016

   I had the exact same thought and discussed this with some friends
recently when I got frustrated that my second Presto card cracked in the
cold weather.

   The magic wand guy is kindof a hero. :) My understanding is that the
Presto cards use an encryption system, so you can't transfer the data off
of them. The most successful "transplants" I've seen have involved
dissolving the cards in a weak acid solution and then transplanting the
skeleton as-is into something else, but the antenna wires are very delicate
and prone to damage.

   I'm curious! I wonder if we can get Presto to ship us up some blank
cards for... "experimental purposes".

    My dream presto card is a weather-proof slab of acrylic with a
bluetooth chip so you can find it after it accidentally slips into the
laundry pile in a pair of your old jeans. :) The Monday Morning Frantic
Presto Card Search is a weekly ritual around our place.

   -Jason Cobill

On Thu, Mar 3, 2016 at 8:19 PM, Tai <argument.de.tai at gmail.com> wrote:

> Shamelessly stealing an idea I read about elsewhere where someone put the
> chip from their transit pass into a wand and tapped that on the bus.
> I'd love to know how to extract the Mifare 2 RFID (I think that's what
> they're on) chip and antenna from the card and repackage it in a fun way.
> Unfortunately, having shone a light through the card, it looks like the
> antenna runs around the circumference. I don't know much about the
> underlying science of RFIDs and I'm not sure if it would just be a matter
> of extracting some chip and attaching a new, equivalent antenna (or
> extracting and reshaping the existing one).
> Any ideas here?
> Thanks,
> ~Tai
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