As long as it is not deleted, maybe you can find it with the subject of the email: Your NFC Ring Unlock App Access Code

@Lafunamor

That's very unusual. Are you working/living in a area where there is a lot of radio waves? Unless you rewrote the tags the whole time they should last for years.

Would the ring be more susceptible than your average ntag? I've had one on a keychain for nearly a year with no issue and a few sticker tags at my house and one at my office that still work fine.
I live in Chicago, so I would imagine the area is quite saturated with radio waves, especially in high density residential areas where everyone and their mother has wifi. My 2.5 ghz wifi has degraded performance and my apartment is on a street that is more commercial than residential.

@Lokki

Have you guys seen the electronic pass code operated gun safes etc that you can pick up cheap on eBay? I wonder how hard it would be to hack one of those into working with NFC. Should be too difficult... As far as I can tell its a fail-close type solenoid that stops you twisting the unlock handle until the correct code is entered.

I'll need to get some guns first. And a foid card. I guess I could put my paintball gear in it :P

Disabling the app as administrator seems to have solved the issue. I'm guessing it has something to do with the app monitoring failed unlock attempts.

ISO14443 Type A
NTAG203
13.56MHz

Not sure if you mean where to find your discount code or where to enter it.
They sent an email with the backer discount codes, mine had the subject, "Limited PREORDERS now available - Your code inside." Inside was my backer discount code.
There was a textbox to enter it during checkout, I believe at the same time I was entering my payment information.

@sffish

Does the NFC Ring App cause the phone's battery to drain excessively? I have a Nexus 5 and just ordered the ring and want to know if anyone using the NFC Ring App to unlock sees an unusually high battery drain. Thanks.

It will be no different if you already have nfc enabled on your phone. The app doesn't change when the antenna is turned on.
I have had no noticeable change in battery life since installing and using the app. I had nfc enabled long before installing the app.

ok, so finally got the sketch to compile. Couldn't get it working on my windows 7 installation even after reinstalling arduino software. I fired up an XP VM, installed the arduino software and the sketch compiled first try. There must be some lingering data after uninstall that I need to take care of.

Got my elechouse today. Different distributor I believe. Doesn't seem to be working with any ntag. It came with a different lib than yours, so I will try out different libs later. Works fine with the tags that came with it.

/e got my module working with ntag using the lib from yours. Unfortunately my ring is not reading at all, looks like its finally time to give up and send in for a replacement :(

@stillwellgray

That's a neat idea. I might have to hit up the lumber yard soon and mock something up using my extra electric strike.

How big were you thinking? I'm considering building a locker for myself. That big would probably be quite expensive to ship. Anyway, sure I can throw it on my etsy store for you once it is done. Will probably take a month or so since I'll have to order some more electronics and don't have a working ring at the moment.