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Old June 24th, 2012, 07:25 AM   #1 (permalink)
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Default NFC tags. What do "you" use them for?

What are you using them for?
1) when put in a car dock, I'd like it to launch google maps since even when not navigating, i still have it displayed about 90% of the time. (Dont own a S3 yet, VZW).
2) when docked at home, I'd like it to switch WiFi on.

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Old June 24th, 2012, 07:29 AM   #2 (permalink)
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I've got a few:

- One by my bed to enable silent mode or loud mode (it's a switch).
- One in my car to enable bluetooth, turn my ringer/notification volume up to full and run Spotify for me.
- One by the front door of my house to enable/disable WiFi and connect to my 2.4GHz band.
- One by my desk to connect to my 5GHz band.
- One at work to turn WiFi off, put phone in silent mode.

If and when it's ever possible to make the phone connect to a specific bluetooth device I've got a few more in mind too.
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Old June 24th, 2012, 06:13 PM   #3 (permalink)
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Car and BT is a good one. Thanks, I'll add that to my list as well as the ringer and notifications off while docked at my bed. Excellent!
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Old June 24th, 2012, 06:35 PM   #4 (permalink)
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When I first saw those TecTiles, I thought it was a goofy gimmick thing. But seeing stuff like this, they sould pretty awesome, might have to get me some! You know, once Verizon decides we're worthy enough to have our phones....
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Old June 24th, 2012, 06:43 PM   #5 (permalink)
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Don't get the TecTiles though. They're about three times more expensive than generic NFC tags.
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Old June 24th, 2012, 07:08 PM   #6 (permalink)
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Are they easy to program? Where is the best place to buy them?
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Old June 24th, 2012, 07:36 PM   #7 (permalink)
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Are they easy to program? Where is the best place to buy them?
I bought mine from NFC tags, labels, and stickers. - tagstand

I use a Galaxy Nexus and the ones I bought are completely programmable. The one issued by Samsung are a little more limited but will work for most users. I use the apps NFC Task Launcher and Tasker for my NFC uses. Check em out. Tasker is expensive btw. Can remember if the other is free or paid.

OP...I edited the title to say NFC instead of NFT (proper anagram for the technology described). Hope you don't mind.

Edit: I use mine to toggle wifi, Bluetooth and screen brightness.
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Old June 24th, 2012, 09:30 PM   #8 (permalink)
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Can they be reprogramed? What's to keep someone from reprograming one you have at work to do what you want plus send $100 from your PayPal account to theirs? Am I just being paranoid?
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Old June 24th, 2012, 10:54 PM   #9 (permalink)
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Can they be reprogramed? What's to keep someone from reprograming one you have at work to do what you want plus send $100 from your PayPal account to theirs? Am I just being paranoid?
They can be reprogrammed, but you have the option to disable reprogramming. Disabling reprogramming is permanent though, meaning there is absolutely no way to ever change the tag again. So you'd have that added security if you so choose.

Being that the tags are cheap enough, I don't see this being a problem.
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Old June 25th, 2012, 12:56 AM   #10 (permalink)
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It might be worth a mention of some things I've noticed with NFC apps and tags.

Programing an NFC tag is all well and good, but from what I can gather apps that "program" them need root access to be able to do a couple of tasks, ie turn off/on mobile data. Not exactly ideal.

There are other apps that work slightly differently, they dont actually program the tag, but read the tag ID and you save a profile for that tag ID within the apps data and can therefore toggle mobile data without root access. Meaning also that the tags data capacity is irrelevant as the tags instructions are saved to the phone not the tag.

Of course, with programing a tag, if you do have an app like tasker, you can toggle mobile data without root access I believe.

Those in the UK, RapidNFC - NFC Tags, Stickers and Products are reasonable price wise for tags. Got 18 for under 20 Inc vat & postage. (14 Ntag203 and 4 standard 1k tags)
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Old June 25th, 2012, 01:04 AM   #11 (permalink)
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It might be worth a mention of some things I've noticed with NFC apps and tags.

Programing an NFC tag is all well and good, but from what I can gather apps that "program" them need root access to be able to do a couple of tasks, ie turn off/on mobile data. Not exactly ideal.

There are other apps that work slightly differently, they dont actually program the tag, but read the tag ID and you save a profile for that tag ID within the apps data and can therefore toggle mobile data without root access. Meaning also that the tags data capacity is irrelevant as the tags instructions are saved to the phone not the tag.

Of course, with programing a tag, if you do have an app like tasker, you can toggle mobile data without root access I believe.

Those in the UK, RapidNFC - NFC Tags, Stickers and Products are reasonable price wise for tags. Got 18 for under 20 Inc vat & postage. (14 Ntag203 and 4 standard 1k tags)
What apps are they? Sounds like a great idea!
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Old June 25th, 2012, 01:09 AM   #12 (permalink)
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The one in trying out is NFC ReTag free version, the UI is ugly as sin, but it does the job, limited by how many tags unless you want to pay, only messed about with one tag atm though. So no idea on the specific tag count limit.
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Old June 25th, 2012, 01:43 AM   #13 (permalink)
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The one in trying out is NFC ReTag free version, the UI is ugly as sin, but it does the job, limited by how many tags unless you want to pay, only messed about with one tag atm though. So no idea on the specific tag count limit.
Thanks, nfc task launcher works for now but if I find my tags running out of space ill try it out!
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Old June 25th, 2012, 01:46 AM   #14 (permalink)
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Good to have the option eh
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Old June 25th, 2012, 08:51 AM   #15 (permalink)
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Noob question(s):
Do these NFC tags work automatically when your phone is in range of the tags or does your phone have to touch the tags?
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Old June 25th, 2012, 09:15 AM   #16 (permalink)
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Quote:
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Noob question(s):
Do these NFC tags work automatically when your phone is in range of the tags or does your phone have to touch the tags?
When NFC is turned on, they just have to be in range, within an inch or two.
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Old June 25th, 2012, 09:28 AM   #17 (permalink)
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When NFC is turned on, they just have to be in range, within an inch or two.
thanks for the reply
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Old June 25th, 2012, 12:46 PM   #18 (permalink)
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I'm embarrassed to admit that I had dismissed NFC as a useless gimmick without researching it first. Now it looks like NFC Task Launcher + Tasker can automate anything I can possibly think of on my phone, which I'm really excited about. My only concern is battery life. Does keeping NFC on all the time have a big impact on battery life?
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Old June 25th, 2012, 01:10 PM   #19 (permalink)
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Not sure I get how this works. If I set one to turn WiFi on, and I set it on or near it. WiFI comes on. Does WiFi turn off when you pull it away or do you need to manually or get it near a new one?
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Old June 25th, 2012, 01:19 PM   #20 (permalink)
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I'm embarrassed to admit that I had dismissed NFC as a useless gimmick without researching it first. Now it looks like NFC Task Launcher + Tasker can automate anything I can possibly think of on my phone, which I'm really excited about. My only concern is battery life. Does keeping NFC on all the time have a big impact on battery life?
Nah. NFC only works from about an inch away so it's not like it uses a lot of power to broadcast over a long distance. In fact, it doesn't seem to affect the battery at all.

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Not sure I get how this works. If I set one to turn WiFi on, and I set it on or near it. WiFI comes on. Does WiFi turn off when you pull it away or do you need to manually or get it near a new one?
NFC Task Launcher can toggle settings, or you can set up "switches."

You could set one with these two modes: -

Office mode: silent mode, WiFi on, low brightness
Non-office mode: loud mode, WiFi off, high brightness

The tag will then automatically alternate between those two each time you use it, regardless of whether the settings get changed in the meantime. So if you used office mode, then turned your phone on loud, turned WiFi off and put high brightness on manually, the next time you touched the tag it will still run "non-office mode" and won't actually make any changes to the settings.

You could also just set it so that it toggles silent mode and WiFi... but that wouldn't be the same, as if one of the settings got turned off (i.e. WiFi off, loud mode on), then the settings would still be uneven (i.e. WiFi on, silent mode off) when you used the tag.

The easiest way to see how it works is by watching videos, of which there are plenty on YouTube. Just search for "NFC Task Launcher"
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Old June 25th, 2012, 01:42 PM   #21 (permalink)
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If you stick a tag in your car dock, does it constantly look at the tag? In other words, if you put your phone down on a tag, is that ok, or do you need to move it away after tapping?
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Old June 25th, 2012, 01:49 PM   #22 (permalink)
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NFC may not use a lot of power for TX/RX but it can have an impact on your overall system power if it is not allowing your device to go to sleep. You would never know this is the case without some good power measurement tools... I'll give some insight as to what I have seen, I measure power at a component level (not with this deivce but with others) and have seen NFC be the root problem preventing the device to go down to a low power sleep mode (S3). NFC would be waking the system (quite frequently) and burning in excess of 100 mw of power during these wakes. When NFC was disabled, the wakes were much less frequent and power hungry thus average system power was much better, ~30 mW. Lets hope Samsung found this during development
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Old June 25th, 2012, 02:10 PM   #23 (permalink)
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If you stick a tag in your car dock, does it constantly look at the tag? In other words, if you put your phone down on a tag, is that ok, or do you need to move it away after tapping?
You can keep it there. I only held it there for 30 seconds.. but in that time it didn't re-read the tag a second time.

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Originally Posted by B33R30 View Post
NFC may not use a lot of power for TX/RX but it can have an impact on your overall system power if it is not allowing your device to go to sleep. You would never know this is the case without some good power measurement tools... I'll give some insight as to what I have seen, I measure power at a component level (not with this deivce but with others) and have seen NFC be the root problem preventing the device to go down to a low power sleep mode (S3). NFC would be waking the system (quite frequently) and burning in excess of 100 mw of power during these wakes. When NFC was disabled, the wakes were much less frequent and power hungry thus average system power was much better, ~30 mW. Lets hope Samsung found this during development
In real terms though, my battery doesn't appear to be any different with or without NFC turned on. It may be stopping my phone from sleeping but the actual power used is making such a miniscule difference on battery life it's not noticeable.

Obviously others may have a different experience, just sharing my own.
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Old July 7th, 2012, 01:28 PM   #24 (permalink)
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How much writable space would I need? Is 46 bytes sufficient? How many bytes is an action?
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Old July 8th, 2012, 08:03 AM   #25 (permalink)
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4 commands is 'typically' about 40-43 bytes. I'd go for Ntag203 myself.
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Old July 8th, 2012, 10:39 AM   #26 (permalink)
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It seems that you need root access. Is this true? I went into gps action and that's what it told me.
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Old July 8th, 2012, 04:26 PM   #27 (permalink)
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It seems that you need root access. Is this true? I went into gps action and that's what it told me.
As I've stated a few times;

Two types of NFC app. One writes data to the tag, and needs root access to toggle mobile data and gps.

The other detects the tags unique I'd and saves a profile to the phone and does not need root access to toggle mobile data and gps.
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Old July 8th, 2012, 09:51 PM   #28 (permalink)
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I'm embarassed to admit this. I wanted to program a tag for my car to turn off wifi, launch slacker and play the last station played, and turn on my Auto SMS "drive" profile and I had no friggin clue how to do it. I mean, things like turning off wifi are a no-brainer, but when it came to getting 3rd party apps to launch I was clueless. I was using Tasker and NFC Task Launcher btw. I guess my NFC tags are going to sit in a pile until I have the time and patience to watch a bazillion YouTube videos!
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Old July 8th, 2012, 10:21 PM   #29 (permalink)
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I'm embarassed to admit this. I wanted to program a tag for my car to turn off wifi, launch slacker and play the last station played, and turn on my Auto SMS "drive" profile and I had no friggin clue how to do it. I mean, things like turning off wifi are a no-brainer, but when it came to getting 3rd party apps to launch I was clueless. I was using Tasker and NFC Task Launcher btw. I guess my NFC tags are going to sit in a pile until I have the time and patience to watch a bazillion YouTube videos!
Open NFC Task Launcher

-> click New Tag
-> Click New Task
-> click '+Add action'
-> click 'Launch Applications'
-> click 'Application'
-> click the name of what ever application is there and scroll down to the one you want to open
-> whenever you are done adding tasks click 'Finish'
-> hold tag behind phone til it writes on the NFC tag
-> Done
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Old July 8th, 2012, 11:32 PM   #30 (permalink)
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Quote:
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Open NFC Task Launcher

-> click New Tag
-> Click New Task
-> click '+Add action'
-> click 'Launch Applications'
-> click 'Application'
-> click the name of what ever application is there and scroll down to the one you want to open
-> whenever you are done adding tasks click 'Finish'
-> hold tag behind phone til it writes on the NFC tag
-> Done
Thanks for helping me. Is there a way to actually get Slacker to play after it opens or will it just open?
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Old July 8th, 2012, 11:54 PM   #31 (permalink)
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Thanks for helping me. Is there a way to actually get Slacker to play after it opens or will it just open?
I use Pandora and it auto starts for me. I am unfamiliar with slacker. When you start the app does it beging playing, or do you manually have to start a song. However you do it now, that is how it will do it via NFC. It will simply start the app. You can add an additional sub-command within the app, but i haven't messed with that feature.
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Old July 9th, 2012, 10:05 PM   #32 (permalink)
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Originally Posted by XplosiV View Post
As I've stated a few times;

Two types of NFC app. One writes data to the tag, and needs root access to toggle mobile data and gps.

The other detects the tags unique I'd and saves a profile to the phone and does not need root access to toggle mobile data and gps.
So the first app in your post would be NFC Task Launcher?
The other app would be Tasker?

Sorry for the questions but you might have to dumb it down for us non programming/root/computer savy folks
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Old July 10th, 2012, 02:14 AM   #33 (permalink)
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So the first app in your post would be NFC Task Launcher?
The other app would be Tasker?

Sorry for the questions but you might have to dumb it down for us non programming/root/computer savy folks
Not exactly,

NFC task launcher will write tags, as oppose to saving profiles to the phone.

Nfc ReTag is one app that will save the data to the phone.

You can tell which is which by the description of functionality under each app. If they toggle mobile data or gps, it's a profile app, if not its a tag writing app.

Tasker can I believe be used with either type of app, as long as that app allows support.
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Old July 10th, 2012, 05:28 AM   #34 (permalink)
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Thanks again. I'll give these a shot
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Not exactly,

NFC task launcher will write tags, as oppose to saving profiles to the phone.

Nfc ReTag is one app that will save the data to the phone.

You can tell which is which by the description of functionality under each app. If they toggle mobile data or gps, it's a profile app, if not its a tag writing app.

Tasker can I believe be used with either type of app, as long as that app allows support.
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Old July 10th, 2012, 09:00 AM   #35 (permalink)
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Ok so i've written one tag in NFC Task Launcher(Car Tag: Toggle Bluetooth, Toggle GPS, Navigation to).
After doing this I went into NFC ReTag. Scanned my NFC tag. At this point am I suppose to add the activity that is associated with the tag?

I also tried the TecTile app and it said that the task was too small or something(i don't have the tag with me so I don't remember word for word). I am using the Type 2 NFC tag.
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Old July 10th, 2012, 01:45 PM   #36 (permalink)
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Ok so i've written one tag in NFC Task Launcher(Car Tag: Toggle Bluetooth, Toggle GPS, Navigation to).
After doing this I went into NFC ReTag. Scanned my NFC tag. At this point am I suppose to add the activity that is associated with the tag?

I also tried the TecTile app and it said that the task was too small or something(i don't have the tag with me so I don't remember word for word). I am using the Type 2 NFC tag.

Ok, i'll try an clarify a little if i can.

A type 2 NFC tag could be from 48 bytes, upto 2kb.

You stated that you have used NFC Task Launcher to write data to one tag, with three commands, all well and good.

As far as the TecTile app goes, I would imagine that your getting an error relating to the tag not having enough space to write more commands to it.

The NFC ReTag app should be able to just ID the tag and let you assign commands to be saved to you phone.

I can only imagine that you may have more than one app trying to ID the tag, at once, possibly causing a conflict.

However (I may have read your post slightly wrong) as far as NFC ReTag goes, once scanned, open with ReTag, then you just tap on activity and select the extra activity(s) you want it to do.

If as you stated, you have a tag set up for your car, then those commands do not need to be added via NFC ReTag as well, instead you would assign different commands.

Hope this helps
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Old July 10th, 2012, 03:39 PM   #37 (permalink)
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Xplosiv, you've been real helpful in this thread. Sorry to keep on bugging you and having you hold my hand in the process.


So looks like I have some progress today. If I were to tap my phone to a tag, it will say:
Quote:
About to connect to browser. Continue? If I hit continue then it will say: You are configuring a secure setting. This will only function if you have made NFC Task Launcher a system app. This requires root access.
Now after this, if I open up NFC Retag, tap the tag, it does indeed discover the tag and prompts me to show location settings for GPS, Permission to turn on Bluetooth. I did add the activities of Navigate and Bluetooth Toggle in NFC Retag.

So based on all of this, I'm assuming I did everything right? Shouldn't it automatically work without me having to open up NFC tag first? Thanks again!
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Old July 10th, 2012, 04:31 PM   #38 (permalink)
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Xplosiv, you've been real helpful in this thread. Sorry to keep on bugging you and having you hold my hand in the process.


So looks like I have some progress today. If I were to tap my phone to a tag, it will say:


Now after this, if I open up NFC Retag, tap the tag, it does indeed discover the tag and prompts me to show location settings for GPS, Permission to turn on Bluetooth. I did add the activities of Navigate and Bluetooth Toggle in NFC Retag.

So based on all of this, I'm assuming I did everything right? Shouldn't it automatically work without me having to open up NFC tag first? Thanks again!

I would keep it simple, and progress from there.

If you still have a programed tag, programed for NFC Task Launcher, I would wipe it clean and leave it.

Once wiped of data, I would just use NFC ReTag to do all your scanning/programming.

From this point just scan the tag, add commands as best as you can and enjoy!

You dont need to have NFC ReTag open for tags to be detected (or at least shouldnt) however if you are on the homescreen, and swype a tag, you usually get a prompt to then open NFC ReTag which you should be able to surpress.


I believe you can goto the options (button above the N of NFC on the main screen) and tick the second and thrid options to make tag detection & device toggles stop appearing each time. This should hopefully stop you having to select NFC ReTag each time you scan a tag.
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Old July 10th, 2012, 04:58 PM   #39 (permalink)
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I would keep it simple, and progress from there.

If you still have a programed tag, programed for NFC Task Launcher, I would wipe it clean and leave it.

Once wiped of data, I would just use NFC ReTag to do all your scanning/programming.

From this point just scan the tag, add commands as best as you can and enjoy!

You dont need to have NFC ReTag open for tags to be detected (or at least shouldnt) however if you are on the homescreen, and swype a tag, you usually get a prompt to then open NFC ReTag which you should be able to surpress.


I believe you can goto the options (button above the N of NFC on the main screen) and tick the second and thrid options to make tag detection & device toggles stop appearing each time. This should hopefully stop you having to select NFC ReTag each time you scan a tag.
Cool. I went ahead and wiped the data being in association with NFC Task Launcher. Did as you said with NFC ReTag. However,despite checking those options in NFC ReTag, it still asks to select an action when i tap the tag: New tag collected or NFC ReTag
I think I can deal with this for the time being. Thanks again for your help and sorry for the OP for hijacking your thread with my questions
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Old July 11th, 2012, 04:37 AM   #40 (permalink)
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Cool. I went ahead and wiped the data being in association with NFC Task Launcher. Did as you said with NFC ReTag. However,despite checking those options in NFC ReTag, it still asks to select an action when i tap the tag: New tag collected or NFC ReTag
I think I can deal with this for the time being. Thanks again for your help and sorry for the OP for hijacking your thread with my questions
I was messing around last night, my NFC ReTag app, is now no longer scanning my tags unless its open (well they scan, but the profile isnt changing, unless that app's open)

As for the pop up surpression, stick with it, I had alsorts of trouble trying to get that to work, tried force closing the app after changing settings and rebooting the phone, and it wouldnt change, then all of a sudden, it was set and i wouldnt get the pop ups.

it's a tad buggy i think, but when it does work, it works well. Just needs a few tweeks.
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Old July 11th, 2012, 08:56 AM   #41 (permalink)
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Thanks for helping me. Is there a way to actually get Slacker to play after it opens or will it just open?
I might be able to help you...I was setting up my new S3 yesterday and noticed a setting in Slacker. Go into settings and check the box for "Resume Play on Startup". Then when your tag starts Slacker, it will automatically start playing.
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Old July 11th, 2012, 11:59 AM   #42 (permalink)
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Hey guys, I went to this site to purchase NFC tags: tagstand - NFC Products Catalog

However, i don't see any indication how spacious these tags, meaning I don't see them saying if they are 40bites or 250bites, etc.?
Am I reading it wrong?
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Old July 11th, 2012, 12:19 PM   #43 (permalink)
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Hey guys, I went to this site to purchase NFC tags: tagstand - NFC Products Catalog

However, i don't see any indication how spacious these tags, meaning I don't see them saying if they are 40bites or 250bites, etc.?
Am I reading it wrong?
First product I went to was this:
tagstand - Logo Type 2 NFC Sticker - Ultralight C - Square (35mm x 35mm)
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This sticker with our snazzy logo on the front is backed by a Mifare Ultralight C chip. This chip features 144 bytes of usable space and can be made read-only.
The other ones I clicked on had similar info. Did you not actually click on any of the product links?
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Old July 11th, 2012, 12:40 PM   #44 (permalink)
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Originally Posted by ylexot View Post
First product I went to was this:
tagstand - Logo Type 2 NFC Sticker - Ultralight C - Square (35mm x 35mm)


The other ones I clicked on had similar info. Did you not actually click on any of the product links?
Dam, now I feel stupid. I did click on it, but I was expecting to see variety of different capacity stickers and did not read the text. Sorry, and thank you.

Edit: Just placed my order for 12 different tags.
QQ, what would you use outdoor tags for?
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Old July 11th, 2012, 01:09 PM   #45 (permalink)
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I was messing around last night, my NFC ReTag app, is now no longer scanning my tags unless its open (well they scan, but the profile isnt changing, unless that app's open)

As for the pop up surpression, stick with it, I had alsorts of trouble trying to get that to work, tried force closing the app after changing settings and rebooting the phone, and it wouldnt change, then all of a sudden, it was set and i wouldnt get the pop ups.

it's a tad buggy i think, but when it does work, it works well. Just needs a few tweeks.
Well that's not good to hear that its running buggy for you. Im not sure what I would do if this program craps out on me since NFC Tag Launcher doesn't work for me unless I were to root
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Old July 11th, 2012, 01:20 PM   #46 (permalink)
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Well that's not good to hear that its running buggy for you. Im not sure what I would do if this program craps out on me since NFC Tag Launcher doesn't work for me unless I were to root

Its no big deal for me, as I have a shortcut to the app on the home screen, so i just load it and scan, job done, no great hardship. But it should work better. Maybe with the next update
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Old July 11th, 2012, 09:17 PM   #47 (permalink)
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I just got my tags in today. As of now, I'm only using NFC Task Launcher, and only have 3 tags made at the moment:

One on nightstand as a switch: turns off LED and all volumes (except for alarm), then turns them all back on.
One on my universal car dock to turn up volumes and start car mode.
One on my desk at work to turn off ringers and start Pandora.

I was thinking of doing one in my pool cue case to update my Facebook status to say I'm playing pool, but NFC Task Launcher doesn't do that, and I don't like the Samsung app. I may have it check in instead, at whatever bar I'm playing in that week.

I may need to pick up Tasker now, just to see how much more I can do with these!
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Old July 12th, 2012, 10:22 PM   #48 (permalink)
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Does anyone notice a significant difference in the time it takes to scan a 1K tag versus an NTAG tag or ULC/UL for that matter?

Also has anyone had any interference problems with tags being on metal objects or close to computers/electronics? Just curious if anti-metal tags are actually necessary.

Just ordered some tags from buynfctags.com today. They shipped them less than ONE hour after I bought them. Amazing! I will report back on how well they work after I get them.
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Old July 16th, 2012, 01:01 PM   #49 (permalink)
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Hey guys, been reading this thread, watched few CNET videos, and still have few questions that I hope someone on this forum can help me answer.

1. Still confused what app I need to make and write code on NFC tag? I hear that some people use NFC task launcher to write and read tags and some people use NFC re-tag. If I understand what I read than both of these apps do the same only one is paid and one is free. Is that right?

2. Lets say I want to make a simple tag for my car doc: once I put phone in the doc I want it to activate bluetooth. I understand how I can do that, however, what I can't understand is what I need to write on that car doc tag to turn bluetooth off once phone is off of the doc? In another words I want my bluetooth to be activated only when I it is in the car doc and it should not be active as soon as I pull the phone from the doc.

Thanks.
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Old July 16th, 2012, 01:15 PM   #50 (permalink)
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1. Still confused what app I need to make and write code on NFC tag? I hear that some people use NFC task launcher to write and read tags and some people use NFC re-tag. If I understand what I read than both of these apps do the same only one is paid and one is free. Is that right?
Nope. NFC Re-Tag does not write to tags. It simply looks for the ID number for the tag and can run tasks if it sees that ID number again.

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2. Lets say I want to make a simple tag for my car doc: once I put phone in the doc I want it to activate bluetooth. I understand how I can do that, however, what I can't understand is what I need to write on that car doc tag to turn bluetooth off once phone is off of the doc? In another words I want my bluetooth to be activated only when I it is in the car doc and it should not be active as soon as I pull the phone from the doc.
What you want can't be done AFAIK.

What you can do is:
Use NFC Task Launcher to write to a tag to toggle BT. Touch it when you get in the car to turn on BT and touch it before you leave to turn off BT. This same tag will do the same thing for any Android phone with NFC.

OR

Use NFC Re-Tag to read the tag and associate it with a BT Toggle action. Touch it when you get in the car to turn on BT and touch it before you leave to turn off BT. This same tag will do absolutely nothing for other phones.

Understand the difference now?
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