What are /r/NFC's favorite Products & Services?

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In theory, yes, in practice, no. You would likely need a lot more familiarity with NFC (and broadly, RFID) to accomplish this. For example, you haven't clarified if the cards are actually NFC (13.56mhz) and not RFID (125khz). Within each of these frequencies are multiple standards, and you phone would only support a certain set of NFC. So if it is actually RFID, your phone would not work.

Since you have your phone with you, maybe you can work towards arranging a time each day that someone you know will be arriving to allow you in, to reduce the amount of time you have to awkwardly wait.

Alternatively, you could try to find another student who does not need to go to campus (I assume some students are still doing all their classes online due to Covid), and ask to borrow it.

I would also suggest, if you explore that route, that you also learn from your experience and find ways to make sure you don't lose their card. Did you keep your card in your wallet and lose the whole thing, or just the card? If you do a better job of keeping track of your phone, maybe consider either a case that has a card slot, or one of the adhesive card holders (https://www.amazon.com/Stretchy-Adhesive-Sticker-Samsung-Smartphones-Dark/dp/B0824JJT3F).

On the upside, it is only about 5 weeks until June when you can get that replacement. And even if you already knew all the details of the card, you might not even be able to get the necessary equipment before then.

We(NFC Ring) provide "NFC Ring Unlock" but it's basically no longer maintained and I wouldn't personally use it because it can be relatively easily circumvented.

Source: I was the guy who lobbied and funded NFC Smart Lock on Android and for it to be removed was pretty soul crushing ;(

Sorry! Your best bet is to Star the issue on Google's Issue tracker with the hope that at some point Google listens to customers.

You might head over to /r/homeautomation if you haven't already. It doesn't sound like you need NFC but rather a simple insteon/zwave/zigbee door sensor that sets off a series of tasks when you get home i.e. - door opens which triggers the door sensor > lights in the front hall come on > music starts playing.

Alternately, if you have an NFC door lock like this you can use your phone to scan an NFC tag which then unlocks the door, plays music, etc. This way the door will actually be unlocked before you even approach it.

Hmmm, might be a good application for Tasker and the AutoInput plug in. Tapping the tag you can have open the app and then with Autoinput could enter in username and password, assuming the security of the app's login doesn't prevent auto fill in methods from other apps.

No worries! I wonder if there's some kind of device restriction since it started automatically on my Note 20. You could try a macro plugin like TouchTask to automate tapping the start button.

Is there a reason you need it to be on black metal? One option is to get the small NFC stickers and place it on the material that you want. However, as u/anguianoewi mentions, NFC does not work well when it is put on another piece of metal. It does look like Amazon have some stickers that claim to work - however, I would definitely say that the quality would be degraded (ie, longer time needed to tag, smaller range, weaker signal) compared to a similar sticker placed on black plastic.

https://www.amazon.com/Black-Metal-Stickers-25mm-Round/dp/B016PLHMM6/ref=sr_1_3?dchild=1&keywords=nfc%2Bstickers%2Bmetal&qid=1607284067&sr=8-3&th=1

Don't know how they do it in iPhone, but in android there is a great app which does it. Used this tool on alot of my tags, and all of them are fine. This app will not lock by itself unless you tell the app to do so (there is that setting in config).

Maybe this is what you already know or not, but as everything, these nfc tags/cards have a lifespan too. They got some write read limits. It's nothing too much to worry about, but just wanted to tell.

I use the app Trigger to program and use NFC tasks. Most of the heavy work I have done by an app called Tasker. Trigger has the ability to call up Tasker's tasks. This is very useful if you have small capacity NFC tags, you only need the tag to be able to store the information Trigger will use to call up whatever Tasks you make and then Tasker does the rest of the work. No need to have it all programmed into the tag itself.

Trigger is free or paid for updated features. Tasker is paid but well worth the few bucks. And most of the upgrade features in Trigger you can do in Tasker, so you are good to go just using the free version of Trigger.

As to what you can do at home, that depends on what kind of thing you think you might like to do. Timers, alarms, automation, etc. Some are super easy and some will take some development. As an example of an easy one, I have a tag near my refrigerator that sets a 30 minute timer. When I need to quick cool a beer I toss it in the freezer section then tap the NFC timer tag. 30 minutes later my phone reminds me to not forget taking the beer out of the fridge before it freezes up.

Idk man, that depends what software you use with your ACR122u reader. I use NXP Tagwriter app on Android, which does allow writing to multiple cards in sequence

I like NFC tools and NFC Tasks. https://play.google.com/store/apps/details?id=com.wakdev.nfctools.pro

https://play.google.com/store/apps/details?id=com.wakdev.nfctasks With tasks you can set up scripts that have your phone do stuff.

The typical NFC sensor in a phone only has a range of a few millimetres.

You'd need one of those Bluetooth LE (Low Energy) things, like this one or this one. The batteries can last up to a year in those.

They are incorrect. You can buy tags with large antennas which should work. Try something like these... https://www.amazon.com/NTAG213-Biggest-Stickers-Adhesive-Strength/dp/B07RDGXX6K

I have a big tag off the end of a spool of filament for a 3D printer that when you load the material into the printer it can read the tag and know what material you loaded. That tag is about the same size as the ones in the link. I can confirm with my Samsung phone with a normal 25mm type tag I have to have the phone only a few mm above the tag but with the big tag I can read it from much much away (I think when I played around with it it was a good inch (25mm) away and still read the tag).

Thanks u/MyVitag! I have a sheet of 0.020" Ferrite, but in my initial tests, having the Ferrite cut to the exact size of the tag doesn't ensure functionality. I need to over-size the Ferrite significantly. btw, I'm using these tags, which have to be placed into a recess about 0.40" deep.

> don't want to have to try and tap it multiple times to register.

This shouldn't really be a problem. I did a quick google search just now and most NFC wristbands are designed in such a way that the NFC-area is pretty obvious (you really can't miss it.)

If you go to Amazon and search on phrases like "heavy duty NFC tag".. you should find all sorts of Keychain or ruggedized

I have some of these (https://www.amazon.com/gp/product/B015EM34WY/).. although weirdly they seem not to be available any more.

But a lot of those variants you can get for like $15 for 30pieces. Cheap enough to play around and test with before you decide which one works best.

More or less the bigger the tag's antenna the easier it is to read from a distance with the same device. So you want to look for cards/tags that are advertised as having the bigger antennas. For example something like these, which are not practical for a credit card type application but would be great for (as the text says) putting in a poster or something...

https://www.amazon.com/NTAG213-Biggest-Stickers-Adhesive-Strength/dp/B07RDGXX6K

Right. Its a miifare classic, so it can only be edited by specific apps, and you have to manually edit the code

If you want to do that, I would recommend this app:

https://play.google.com/store/apps/details?id=de.syss.MifareClassicTool

I was able to use the MIFARE classic tool to read and write the raw data. Obviously this is implied by the name but the app only works on Mifare classic NFC cards

https://www.amazon.ca/dp/B09K48W2JD/

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These can be overnighted for a really good price...

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I'm actually just getting started on my NFC journey, looking to make digital business cards...

You can duplicate your card on another UID modifiable one (like THAT) using Mifare Classic Tool on your phone for really cheap.

I was doing the same search as you, about to buy a popl off amazon for $15 to try it out. You can set your own link for both the NFC and the QR code on the card or customize their provided profile page with your IG and other socials from what I can tell

Personally, you can buy those greeting card with short-recorder electronics and rig a tiny button on your picture frame. MUCH more effective and fool-proof than trying to do NFC or even Arduino.

This one uses a light sensor. They also have a button control version, with internal and external battery.

https://www.amazon.com/Icstation-Light-Module-Music-Player/dp/B01IUHQJ3G/

I buy my tags and stuff from rakuten, amazon, or aliexpress. I get all my info from the NFC blogs- adafruit and sparkfun are great resources too0 they both have a lot of youtube content and tutorials.

Here's a link to my NFC Car Wrap! https://www.behance.net/gallery/22031981/NFC-Matte-Car-Wrap-for-TriadPrint

30PCS NFC 213 Tags,Round,Size... https://www.amazon.com/dp/B08NP8HKCH?ref=ppx_pop_mob_ap_share

Why the f are they selling these then? And why is every listing I buy the same thing?

Do you know of anywhere to buy some that will actually work?

ive uploaded a .7z with the contens of my dump to make it easier. if you or anybody needs more just feel free to ask, im kinda clueless as of now and im stuck

Taskeris one of the more popular choices to do all sort of things. Basically if your phone can do it then Taskercan probably automate doing it as well.

That's the raw hex data you can use something like [NFC TagWriter by NXP[(https://play.google.com/store/apps/details?id=com.nxp.nfc.tagwriter) to read files in a understandable way but that card does look empty they probably use the id which is unless you rewrote they card by accident

If you read the comments a couple of people have tried getting that Android App to work with OnePlus https://play.google.com/store/apps/details?id=com.yuanwofei.cardemulator.pro&hl=en_US&gl=US

I've decided on grabbing a few DESFire EV1 cards and a PN532 board and using the Arduino library from this project.

I could do that the only issue is I want it to act like a normal backup camera as in I engage reverse->power from the reverse signal(lights & backup camera) powers the NFC tag-> Tablet switches to app showing camera feed via Bluetooth(Camera will be constant feed but only have app up when NFC card is active).

I think this might be a possibility.

That's good to know about the shortcuts!

I was looking at this one: https://www.amazon.com/gp/product/B071ZZTT6T/ref=ox_sc_act_title_1?smid=A204R99Q3U43DD&th=1

In the questions, some people say that it can't be rewritten, even though it's an ntag215.

>What is the problem and how can I fix this?

Mifare Classic 1K are essentially 'proprietary'. They don't conform to the "NFC Forum" specifications (one could argue that makes them not NFC, but it feels academic). As such, only nfc reader/write chips by NXP (who makes Mifare Classic 1K) can talk to them. iPhone's NFC reader/writer chip isn't by NXP (can't recall who makes it).

> Do I have to buy a read/write device

Basically yes, or an Android if you still want the phone form factor and portability. Good news is that they're only $30-40 USD (https://www.amazon.com/dp/B07KRKPWYC/ref=cm_sw_em_r_mt_dp_QTX2TM717JBD7C0XDEFY).

> and use windows to write them?

Or mac or linux. Any major desktop OS should work.

I assume you're encoding these tags with NDEF data? Which means someone just needs to clone the NDEF payload to have a copy of your key.

The Yubikey addresses this by using OTP (which is why the Neo is so cool: it generates a new NDEF payload each use). It also plugs right into Lastpass enabling a system very similar to what you're trying to build; only with OTP, OATH (oath-htop), Challenge-Response built right into the hardware.

I guess your angle could be that you only need a $1 NFC tag instead of a $40 NFC key. But personally, IMO, for my password security, I'll take the hardware-based secure element.

buy those, sign up for websites like carrd.co or linktree.com and add all your socials there and then just link your web page there, its small as its only a URL so its defo what you want

I am using a tool called Trigger which I found many years ago and I do not think is supported any longer. But it has always worked fine so I haven't bothered to look for anything else. Part of that is because Trigger allow you to trigger Tasker tasks. So really most of my Trigger work is simply to then turn over the heavy lifting to Tasker. I am sure there are many other apps that will work with NFC tags and allow working with Tasker but as I said I haven't needed to look for one yet.

Thanks for the fast reply. Just got an idea after reading your post
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As I'm just wearing a watch and no rings etc, having an nfc/rfid tag within the watch band seems to be the perfect solution. So I searched for some and found these here:

https://www.amazon.com/Hornady-RFID-Watch-Band-Tag/dp/B08SQ688BB

Doing some further research but I might give them a try.

I use these with the Simply NFC app.

THONSEN 25pcs NTAG215 NFC Cards Work with TagMo and Amiibo for All NFC-Enabled Smartphones and Devices https://www.amazon.com/dp/B074M9J5L3/ref=cm_sw_r_cp_api_glt_fabc_07MKGQFT1YJWHYFE21NP

I don’t use linktree, but it links to a hidden page I made on my website: www.jontaylornyc.com/nfc

>Do they make cards, fobs, etc with multiple chips inside?

As equipter said, there are cards with multiple chips that are for different frequencies, but not with multiple chips for the same frequency.

If there were multiple chips in the card, how would the door know which one was correct? If the door was willing look to at all of the cards an allow you in if any was correct, then you've just created a security hole.

>We have multiple locations

If this is a singular organization, perhaps the could add the same card for multiple locations? Alternatively, it could be intentional that you are given a different credential for each location, to that a lost card only impacts one location.

The closest to what you're looking for would be one of those devices you can program with multiple credentials, but they are bulky: https://www.amazon.com/Keysy-RFID-Duplicator-keycards-keyfobs/dp/B07D7K2LCB

I would suggest an ntag215 for greatest device compatibility, decent read speed and enough space for a web URL.

How to Choose NFC Tags? https://www.linkedin.com/pulse/how-choose-nfc-tags-kristy-yi

I personally like these as they are marked to clearly indicate to scan with a smartphone:

https://www.amazon.com/dp/B078WMQPCZ/ref=cm_sw_r_cp_apa_glt_fabc_F0T35TTGWYD2R55XQ47Q

I don't immediately see correlation between the printed card number and the UID.

Can you post the full card data?

If you have an NFC enabled android phone, you could one of many apps (NFC Taginfo, or MIFARE++ Ultralight would likely work fine) to dump the full contents of the card (if it's not password protected).

The watch doesn't need to connect to the tag. There are lots of apps (NFC Tools for android is one) that can create a Bluetooth connection tag, for whatever MAC you want.

Yes sure, I am talking about that kind of chip: https://www.amazon.com/13-56mhz-Writable-Changeable-Rewritable-XCRFID/dp/B07QMWHCR9/ref=mp_s_a_1_3?dchild=1&keywords=uid+writable+card&qid=1618709475&sr=8-3

It might not be possible depending on the system that reads the card. If it just uses the UID of the card, you might have some success using NFC Card Emulator Pro (root), but it's a paid app, it requires root, and if your apartment's system looks at anything besides the UID it will likely not work.

I wish you luck in your quest, but warn that you might better success cloning the card on to a small sticker that you can stick to your phone (or whatever else).

The only app I've had any success with with is NFC Emulator Pro but it requires root and doesn't work for every card in every situation. Most gym cards that I've seen are pretty simple and are only based on UID, so there's a good chance it would work (again, with a rooted phone).

They are commonly available:

https://www.amazon.com/Fashion-Waterproof-Multifunctional-Intelligent-Digital/dp/B08745M33D/

Different tags will have different methods of cloning, and some can't be cloned at all. The NXP Taginfo app will be able to tell you what kind this is

Don't assume it'll work. The tag might still not be compatible. If it is, it still might not work depending on what the reader is looking for (just UID or data/keys too). You're probably best to just try it and see if it works (once you have root). You can always buy the app, try it, and if it doesn't work, request a refund right away.

NFC Card Emulator Pro (Root) is the only app I've had success with. It's a paid app, requires root, and won't work for everything.

I also have NFC Tools Pro. I'm not saying it doesn't work, I'm just saying that I've never gotten it to work.

Honestly, if you just want convenience, it'd probably be easier and more successful to just copy it on to a sticker and stick it to your phone/phone case/wallet/watch. Though if you can get it emulated on you phone, it's way cooler.

For Android:

I personally use NFC Tools- it has very good writing functions, and allows you to lock the NFC chip with passwords or even make it read-only.

For doing special tasks (ie, turn on flashlight, change brightness, etc), I use NFC Tasks, which is made by the same developer and has added functionality. There are some pro features that require payment, but I have never needed to use any of those yet.

Hope this helps!

I recommend TagWriter by NXP (they make NFC chips).

Anything you encode using NDEF will be readable without an app on Android and the latest versions of iOS.

Hey, that's an awesome concept! I'm also writing apps with NFC capabilities. I made Illud for lists of items stored on tags. Sadly, OP needs it for iOS, and I write for Android. What did you write PixelStix in (as it appears to be for both iOS and Android)?

NFC Tool can launch an app on Android: https://play.google.com/store/apps/details?id=com.wakdev.wdnfc Keep in mind that NFC Tools or similar app would need to be installed for the NFC tag to trigger the launching of your desired app.

I don't have any experience with Android, but there are apps emulating NDEF formatted tags (https://play.google.com/store/apps/details?id=com.maxsoft.ndeftagemulator&hl=en_US), and the Android documentation describes the Supported NFC cards and protocols

OK so you're gonna wanna figure out a few things before you start cloning things

1. is the system depending on the unique identifier (UID) or is it based on code stored within the blocks of the chips?
2. if I were you id go for a pro mark 3 easy, they're cheap and custom firmware found here can be much more useful and versatile.
3. the chip is high frequency but I'm guessing the app you used to scan your fob was "NFC Tools (/pro)" if you could, please download NXP Tagwriter and scan it and send a photo from there, it gives much better info IMO
4. looping back round to 1 and 2, a proxmark will let you do all of those given you have the right type of fob. personally I have a large stock of these or similar as they're UID changeable and susceptible to "magic" commands which means they cannot get broken really.

if you need help wrapping your head around it feel free to reply to me here or shoot me a message I'm part of an online forum for people of an RFID interest so I'm sure we can help you out :}

Probably just one of these. As far as I know, there’s really no way to tell what exactly it was used for. Unless maybe you could dig into and decode anything written on it.

You've got (at least) 3 projects.

1. Obtain NFC card. Which one?
2. somehow get printed picture on said card
3. program your NFC card with the ability to turn Wifi on/off

That sound about right?

1. Look for any NFC card on Amazon

2. White Sticker paper is also on Amazon. You can take this paper to your local print shop (or even use it on a home printer) to put your desired image on. Obviously you'll have to get the image size just right to properly fit onto the card. After about 5 you should be a pro!

3. I know you can put a URL on your NFC tag and I see the need to turn WiFi off/on here often so I'm sure there is some common way of doing this but if not, then you will need to 'seize the day' and figure out how to package the off/on action of your WiFi into a URL. Once you've done that you can use any NFC software app and assign the URL of the off/on switch to your card(s)

Hope this helps!

Not much experience programming except a web design class a few years back. I can solder fine. I'm planning on using a arduino nano and

RFID RC522 Module IC Card Reader Read RF Proximity Sensor, with S50 Blank Card, with Key Ring, for Arduino Raspberry Pi Nano NodeMCU(Pack of 2sets) https://www.amazon.com/dp/B07PY38DMP/ref=cm_sw_r_cp_apa_i_fE89DbYQZTDF3 As the reader.

I will be using an xNT implantable chip.

Edit: the range will only be about a cm or so

Ok so if you have a sharable calendar link you can, for example, encode it in a QR code and write a bit.ly redirect Bellow it too. That way somebody with a QR code reader app will just scan it and somebody with no app to read it or camera can always type it in.

For example on Android there is this one which I find quite nice: https://play.google.com/store/apps/details?id=com.blogspot.aeioulabs.barcode

But any will do, you're only after the link. Print a few stickers with basic info relating to that room, the QR and the link in text and it'd be enough.

Yes, and no, there is an app but it can only copy/create the tags you want if they are not encrypted or if you have the auth keys needed. Also it has gotten a lot more restricted recently, so some of the functionality that you need might be gone.

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Try NFC Tools https://play.google.com/store/apps/details?id=com.wakdev.wdnfc&hl=en_US

Buy Tasker and then create shortcuts on your home screens to activate Tasks you create. Same thing, right? Unless I am misinterpreting your question.

You can use Mifare Classic Tool to get a dump. It's output is color coded so that you can easily see the keys and it can also decode the access control bits for you. It can should also allow you to overwrite it sector by sector if necessary, allowing you to change the keys in the process.

If both keys are shown there, at least one of the keys per sector should allow you to overwrite them (besides the UID part of sector 0). If only one of the keys is listed, you'll need something like an ACR122U reader or a proxmark to find the unknown key using one of the exploits against Mifare Classic.

You can use Mifare Classic Tool to get a dump. It's output is color coded so that you can easily see the keys and it can also decode the access control bits for you. It can should also allow you to overwrite it sector by sector if necessary, allowing you to change the keys in the process.

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If both keys are shown there, at least one of the keys per sector should allow you to overwrite them (besides the UID part of sector 0). If only one of the keys is listed, you'll need something like an ACR122U reader or a proxmark to find the unknown key using one of the exploits against Mifare Classic.

How can I check that?. Say if i can clone the card using this:

English 10 Frequency NFC RFID Card Copier Reader Writer Duplicator for IC ID Cards and All 125kHz Cards,10pcs ID 125khz Cards + 10pcs ID 125kh Keyfobs + 10pcs 13.56mhz UID Key + 1 USB https://www.amazon.com/dp/B07L2WH57V/ref=cm_sw_r_cp_apa_i_RrOIDbC04QRW9

To a blank card, this one:

10pcs UID Card 13.56MHz Rfid PVC Thin Uid Changeable block 0 writable Card https://www.amazon.com/dp/B00N4VCJEM/ref=cm_sw_r_cp_apa_i_msOIDb1VJE1JF

Could I clone it to the subdermal implant?

This isn't the solution you're looking for exactly but you can stick an NFC toggle in your quick settings with this app. Tiles

Something like this device? Along with the app Tasker to say double tap the play button to favorite? or even replacing the controls to say press play and it opens your maps or whatever.

edit: this is a non NFC solution but it might work out better by the sounds of your use case

The oneplus one has nfc and is $242.95

https://www.amazon.com/OnePlus-3GB-RAM-64GB-ROM-International-Version/dp/B00LEAPLWW/ref=sr_1_3?s=wireless&ie=UTF8&qid=1491776813&sr=1-3&keywords=oneplus+one

I use this in my car HomeSpot NFC-Enabled Bluetooth Audio Receiver for Sound System maybe it'll work on the computer? There might be better options, I didn't look.

Edit: other commenter, you're shadow banned.

Tags don't "wear out" other than physical wear or physical damage.

I got some plastic-backed NFC chips same size as stickers, and even comes with 3M adhesive in the back.

I know it's a bit more expensive, but it appears to be far more durable.

http://www.amazon.com/gp/product/B00FS4AF0S/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

I'm not familiar with that program, so I cannot say if it's accurate or not. If you have an Android phone with NFC, I would suggest downloading NXP TagInfo and scanning the card with it so you can see what it says under 'IC Type' in the info tab.

> even though my phone doesn't directly support it.

Can you elaborate on 'it' ? Just that app, or Mifare Classic tags?

Have you tried MifareClassicTool? https://play.google.com/store/apps/details?id=de.syss.MifareClassicTool&hl=en

There are a few projects that have done this. There are 3rd party Android apps available in Play store: Liapp and Glimp

The next part should be develop some sort of transmitting device, that will continuously (every few minutes or so, maybe this interval could also be adjusted) read the sensor and will send it to my phone or tab. Maybe something similar already exists and could be used for this?