I gradually get used to the idea that soon the whole person’s life will be concentrated on the phone. Not in the sense that we will constantly walk around, having buried ourselves on the screens of mobile phones, but in the fact that the phone will become an identity card, a wallet, and an identifier, and a pension certificate, and rights, etc. In fact, despite the obvious risks, I would be very happy about this, since it would save a lot of time.
But despite the fact that this is a long way off, today everyone can take a small step in this direction.
On the Internet you can find many instructions on how to free the card for the metro from the outer shell, and then make from it, for example, a ring with which you can go through the turnstile in the metro. The topic of rings is not close to me, and there is no metro in my city, however, I also have not been spared by the need to often use a contactless card. a work pass.
Each time, coming to work, it is necessary to get a pass to scan it in the turnstile at the entrance. Considering that my favorite wallet is protected from scanning (which the wallet manufacturer even warns with a special sign), it will not work to attach the wallet to the reader.
It is inconvenient to get a pass from the wallet every time the turnstile passes, so you have to keep the treasured card in your pockets, which means there is a chance to forget when changing clothes.
But I always have a phone with me. The solution is found. you need to integrate the pass into the phone. Alas, this cannot be done programmatically. the chip on the pass is protected from copying, and transferring it to the phone will not work. So, let’s go along the path of metro-travel train modernizers.
First you need to understand that a coil with a microchip is sealed inside the card, on which the identifier read by the receiver on the turnstile is recorded. Look, the coil is visible in the light.
Our task is to remove this coil without damaging it. The main difficulty is that the chip is connected to the coil with two thin wires that are very easy to break.
So, instead of mechanics, chemistry will help us. We will soften and stratify the card with the help of aggressive substances.
The network recommends using acetone for this purpose, which will dissolve the body material. I did not use acetone, because I do not want to wash the coil from the remnants of plastic later. Instead of acetone, I took a UV glue remover (LOCA). It should act less aggressively.
We take metal or glass dishes and fill the card so that the entire surface is under a layer of liquid. Do not use plastic containers. acetone will melt them, and soak the card in a sealed container so as not to breathe in vapors. Leave it all for three to four hours. At first, nothing seems to be happening. No need to rush. everything will be.
Four hours later, we see that the card was stratified and deformed due to the fact that different layers softened at different speeds. Well, that’s what we need.
We take the card out of the liquid and begin the process of separation. Do not rush, the risk of breaking the wire is high. We gradually remove the coil from the plastic, periodically checking the position of the microchip for clearance.
If you do everything slowly and carefully, in the end we get just such a design, free of plastic. Most of the work is done.
Now we fix the place where the coil joins the microchip with tape. I just pasted this place with tape with tape on both sides. This had almost no effect on the thickness, but now the coil can be picked up without fear of damaging the contacts.
The point is small. install the resulting device into the phone. In my case, this is already familiar to you Samsung Galaxy S7 Active, which from day to day is waiting for a new camera and therefore has not yet been taped. Considering that after replacing the camera the phone will be sold, the coil will be there temporarily, until the sale. Before the final assembly, I will remove the pass from the phone and rearrange it to the next device.
We are looking for a convenient place to place. I placed the pass so that the microchip was in one of the recesses of the damping layer and did not interfere with the rest of the elements during assembly.
It turned out great. The chip in the recess, the coil in place. It remains to put everything together.
We assemble by first making sure that the new element did not affect the thickness and did not become an obstacle. Everything is fine, the frame fell into place without any problems. Finally we collect and turn on the device. The phone is working, it is already a success! Alas, given that the pass works at frequencies different from those used in NFC telephone chips, it will not work to check the coil’s performance directly on the phone — the phone simply does not see the pass and has not seen it before.
So the hybrid will be tested by battle tomorrow morning, when I go to work and try to get through the turnstile using the phone, and the article will be supplemented with a gif confirming the method is working (or not) :).
UPD: And here is the promised GIF. Everything works as it should.
This method also works for travel subways, with which, given their smaller thickness and density of plastic, everything is even simpler.
Instead of a conclusion
After completing work with integrating a phone pass, I was struck by one thought that now haunts me: how is a contactless bank card arranged inside?
From the moment I found out that you can pay using the Samsung Gear S3 using the Samsung Pay service, I wanted this watch for myself.
However, their cost is too high for me, and I’m just not ready to take and give such an amount for such a gadget. So, let’s try to make an analogue of such watches by dissolving a bank card and integrating the internal filling into a smart bracelet or classic watch. Of course, this will not be Samsung Pay, but the very fact of being able to pay with a bracelet and watch motivates experiments.
I believe that sooner or later the digital era will come everywhere and people will become even more mobile, and while the process of introducing electronic NFC passes has not reached all organizations, you have to get out yourself, creating additional conveniences.