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Originally Posted by Rayine
NFC still trips me out.
Still have no idea how it works
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Meh, it's pretty simple.
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NFC works using magnetic induction: a reader emits a small electric current, which creates a magnetic field that in turn bridges the physical space between the devices. That field is received by a similar coil in the client device, where it is turned back into electrical impulses to communicate data such as identification number, status information, or any other information. So-called 'passive' NFC tags use the energy from the reader to encode their response, while 'active' or 'peer-to-peer' tags have their own power source and respond to the reader using their own electromagnetic fields.
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http://apcmag.com/inside-nfc-how-nea...tion-works.htm
As for the actual data from NFC tags, it's short and mostly text-based data.
The Presto card, however, has two NFC tags according to what my Galaxy Nexus detected. Neither of them are writable from my phone and only one of them is readable. I think I read somewhere that I need a key to read the other one, but also that this particular version is vulnerable if you can get your hands on some expensive NFC gadgets.
Just a heads up, if your Presto card balance goes into negative, you have to go to a GO station to ask them to unblock it by paying the negative balance in cash. Doesn't matter how much you top up, that money won't show up until you do this.
Hopefully, this fall, when they release the next gen Presto. This will become slightly more sensible.
