Getting through RFID key-card doors is a pain in the behind when your hands are full of books or files, and your key-card is in your pocket, or swinging free on a lanyard.

To address this problem, GeeDee86 let me have some redundant cards to play with, and I managed to turn the cards into bracelets.

Caveat: This technique should work on most cards with RFIDs embedded, but be aware that it is not acceptable to do it to some payment cards, such as the Oyster card you use to pay for your London commute. Check the ToS of your particular card, and look for clauses on mutilation.

Step 1: Materials and Tools

As well as the card*, you need:
  • Non-polar solvent, such as nail varnish remover, paint thinners, acetone or petrol.
  • Shallow  non-plastic tray or dish. 
  • Tools to prod and stir.  Wooden coffee stirrers, metal forceps or narrow-nosed pliers are ideal.
  • Non-metallic material to make a bracelet. I used a popsicle stick, but you could use papier mache, thin plywood, heavy fabric, scrap acrylic etc.
  • Superglue.
  • Tools appropriate to your materials
  • Glues or paints as required to finish the bracelet materials, if desired.

Safety: Most non-polar solvents can cause contact dermatitis, so I recommend using protective gloves and eye protection. You also need to ensure that you have plenty of ventilation, as the fumes are toxic and do odd things to your head, and the fumes of most solvents are highly flammable, so be aware of your personal fire precautions.

*I have no images of the cards before starting the project, in order to comply with Data Protection legislation.
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Very clever, Kiteman.
Could you put something over the bracelet, like leather or my favorite substance, sugru? and could you perhaps do this to a watch or other types of wristbands? or would the watch be too thick for it to be read?
You could cover it, just not to thickly. Putting it on a watch strap is a good idea, some folk might find it more comfortable.
How did of that ure a genius I love the idea
It's not a new idea, just a different take on it.
Why not just make a leather bracelet with a card pocket. You can use thin leather to make the card pocket and insert the card into. <br> <br>The thing with this is that you may want the card to sit vertically on the fore arm so the bracelet would need to be as wide as the card is long. A couple benefits to this is that a watch can be attached and it would appear to be just a watch with an unusually wide band. A bill or two stuffed beneath the card makes for a simple emergency money spot.
That would work, but be far larger than this version. You'd effectively be strapping your wallet to your wrist, which doesn't really work in a &quot;suit&quot; environment, and clashes with a lot of folk's style choices.
Great idea. Just a thought. I believe the issue with the chip needing read not the antenna is the antenna is actually an inductor gathering power to power the chip not necessarily transmitting data. Forgive me if I'm mistaken, I haven't played with that tech in a while.
I think you're right - the location of the chip was just coincidental to the ideal angle oc the antenna.
very good idea!
Thank you.
Could you cast this in resin, and make this more decorative?
I expect you could, yes.
Really interesting. I wanna see if and how this works and if I could apply this to a paracord bracelet I have, like weaving it around it. I use rfid cards st work and it's hell trying to carry stuff around and always having to use it... Very very secure building.
Just to clarify: this is an <em>NFC</em> bracelet, at least based on how you actually have to hold it close to the reader to open the door. Real RFID has a longer range. The distinction is important because RFID can be tracked remotely without the wearer knowing, while NFC can't.
Thanks for the clatification.
It remains me to pledge here: <br>http://www.kickstarter.com/projects/mclear/nfc-ring
I suppose this is a good idea. However, when that time comes when it's required to have these RFID chips implanted in your body, I will absolutely refuse these devices for all reasons and accounts... <br> <br>Call me paranoid, but you'll see...one day we'll be required by law to get them under our skins to be tracked...
This reminds me of something i saw online the other day. Apparently some hobbyists had glass RFID capsules implanted into their hand for this purpose. <br>http://en.wikipedia.org/wiki/Microchip_implant_(human)
I remember Kevin Warwick's implant being on the news.
great idea
Thank you!
You could also probably coat the outside of the bracelet with epoxy resin to make it more durable.
That would be a good idea, if I had some resin...
Very cool. I have a few RFID cards I'll have to try this with.

About This Instructable




Bio: The answer is "lasers", now, what was the question? If you need help, feel free to contact me. Project previews on Tumblr & Twitter: @KitemanX
More by Kiteman:Valentine's Heart FidgetCube Halloween Projects 
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