NFC + metronchiki = great benefit

Now practically in each new communicator the module of work with NFC-tags is built in. However, as is often the case, the harsh domestic realities are not keeping pace with technological progress and, to put it mildly, it is not easy to discover the real use of new technologies in everyday life.
There are only two problems:
1. People who could popularize the technology, either do not see its benefits, or its implementation costs money inadequate returns.
2. People for whom the technology was invented, generally do not know anything about it and often did not even hear about it.

Therefore, today I will make a small contribution to the piggy bank of the ideas of those people for whom NFC is a dark forest.

So, for the emergence in our life of another funny nyashki we need:
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1. Any Android phone with an NFC module .

2. Several used metronchikov. I just grabbed my turnstile in the morning. But you can buy and new , with them more interesting.

3. NFC Retag (pro) program from the market.

First, for new ones, a small insight into the technology.

Near Field Communication, NFC (“near field communication”) is a short-range wireless high-frequency communication technology that enables data exchange between devices located at a distance of about 10 centimeters (about 4 inches). The NFC device can communicate with existing smart cards and readers of ISO 14443 , and with other NFC devices, and is thus compatible with the existing contactless card infrastructure already used in public transport and payment systems. NFC is aimed primarily at use in mobile phones.

© Wikipedia

How it works

You unlock the phone, bring it to the NFC-tag, the phone performs the programmed actions.

The simplest example: the Yandex.Metro program. Run the program, attach the metronchik to the back cover of the phone, find out the number of trips and the date when the metronchik will be rotten.

A more complex example: you come to the store to choose, say, a TV. It is difficult to place all the information about modern TV even on an A4 sheet. Therefore, on the price list reference sheet, you can place basic information on which customers look “simpler” and the NFC mark, and put an NFC tag under the sheet, which will contain all the detailed information about the product, or lead to the store's web page.

An even more complex example: the client-bank on the phone is trained to respond to certain data in the tags. Suppose you came to the cinema for the premiere of “Garipother 94: Finally, everyone will die.” No tickets were sold in advance, and the cinema has been besieged by crowds of fans since yesterday evening. Your number in line, most likely, will be over9000 and you will only see the movie next week. However, in the cinema stands Satan-machine, which allows you to take a seat and pay for a ticket using NFC technology. And you just buy a ticket to bypass the entire queue, attach the phone to Shaitan machine, which transfers all the parameters of the transaction to your phone, and agree to pay the bill. Something like this .

Metronchiki in the subway - these are the same NFC-tags. The identifier is recorded on the metronchik, the turnstile reads it, checks the database and responds according to the server's response.

Why do we need dead metronchiki?

Since the metronchik is a write-protected NFC tag, we can only manipulate actions programmed in a third-party program that are tied to the identifier of this tag.

In the whole market, I have so far found only one program that makes it as simple as an ordinary user dreams of - NFC Retag . It does not shine with a super-interface, but it performs its functions for all 2.5 dollars that were paid for the pro-version. The differences between free and pro are only in the number of NFC tags available for programming, but I did not get to the limit, I bought it in thanks for the fact that this program was written.

The scenario of using dead metronchik I have the following:

When I am at home or at work, I should have all wireless communications turned on, except Bluetooth, synchronization is turned on, but the call should be muffled at home, and in the office there should be only vibration mode at all.
When I am away from home, turn off all wireless connectivity, turn on the player.
If I hadn’t sold the car, there would have been a third point where GPS, Bluetooth would turn on and navigator started.
So, run the program.