This is probably not worth the thread, but let’s see where it goes… 
Think of this as a sister thread to:
RFID can also be found in more likely places
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I popped into a KFC today
I noticed on my way in, A Salto on the door, I was surprised to see this particular lock on a commercial premises.
Although, it probably only gets used ~twice a day
(opening and closing)
I tapped my diagnostic card to the lock, and for a battery powered device, it had a rapid duty cycle (Not recorded, but pulsed ~twice a second) and what looked to be surprisingly powerful pulse
Then I noticed a more commercial Salto reader to access the kitchen
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Saw this on the locker where you leave your personal effects before entering an escape room. I thought it was the IKEA one but it’s not as square and it’s not white. Worked fine.
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That’s interesting, is the RFID part of the tamper seal, or just like a serial number?
Like, does the tag stop responding if it’s been tampered with or something?
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not sure, but i would suspect its purely to read the ID so you dont have to type it in the computer or a logbook
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Most are RFID tags with tamper detection have a tamper bit that is 0 or 1 depending on the status of a pair of pins connected to fragile loop of wire or usually some very fragile printed material that winds through whatever you’re trying to protect against tampering. The tag always operates but includes a data bit to indicate the status of this loop based tamper detector. Mess with it and break the loop and it’s easily detectable by checking the data bit on read.
The ntag family of chips have a temper detect version. Here is the data sheet for the ntag213T
NTAG213TTLF.pdf (618.7 KB)
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those are neat, are they latching bit or do they reset?
ie, can we use the bit to read a switch position?
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I wonder if those could be hooked to a switching optical diode to be able to turn on and off with a light
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I believe it’s OTP (one time programmable) so once it’s flipped it can’t be unflipped.
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I was driving around with an Evil CrowRF today and logged a cluster of 6 to 8 433 beacons driving across a highway bridge… another on a busy street intersection. I’ve yet to discover what they are.
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It might be bridge condition beacons … temperature but possibly also expansion / movement etc.
I need to drive around with my Evil Crow and see what I find.