About NFC tags you have to know the cost advantage of knowledge is big

I do not know since when, NFC near-field communication technology has gradually entered the life of ordinary consumers, more and more products and fields are beginning to appear NFC figure, whether it is interactive advertising, bus cards and even wearable smart wrist strap equipment. Attentive consumers may have noticed that we often see "Electronic Business Cards" using NFC tags in bus stops or store billboards, and this NFC tag holds a lot of information, whether short text, Web addresses, contact information, or even a link to the Google Play app store. Can be saved on a small NFC tag. Future NFC has a very large likelihood of replacing many of the existing technologies, including two-dimensional code and the Qi Bluetooth wireless standard code. So what about NFC work? On how NFC works, first we need to know that NFC is a passive product, that is, the NFC tag itself has no power, they need to rely on devices such as mobile phones to activate, and not work on their own. So how are NFC tags activated? To make NFC tags work, generally speaking, is the product that has the power supply to let NFC coil produce current, and the method that produces current is electromagnetic induction--The coil current of the handset produces a magnetic field, the magnetic field again affects NFC coil and produce current, this work principle is similar with the wireless charging technology such as QI or A4WP. It is because of this principle that general NFC can be used only at relatively close distances, not as long as other communication technologies. The signal receiving device is basically the same as the active one in principle, but the direction is opposite. Once the receiver has sensed the magnetic field signal within the effective distance, the electronic receiver will begin to generate a matching current and transmit it to the smartphone. Although some current loss is unavoidable in the process of transmission, it will not affect the normal reception of the signal in the short distance NFC transmission. These circuits are tuned to specific frequencies to increase device sensitivity at a specific frequency. and the entire signal in the air will travel a very large energy transfer. Since the day of development, NFC has not only had a label, in general, the NFC label uses the ISO 14443 type A and B standards, which have been used in many public transport systems. The disadvantage of these two types of labels is that they can only carry very small data, and can only be transferred to the speed of the kbit, such as SD cards and other storage devices, but in the transmission of some very simple information such as Web sites, business cards, etc., it will not affect your use experience. At present, Sony has also invented another NFC standard, the standard NFC coil transmission speed of up to 212 kbit, can be used for some more complex applications, but unfortunately, this coil is not allowed to read and write. There is also a fourth NFC standard, with read-only properties, but with up to 32k bytes of memoryThe transmission speed of the capacity and the kbit to 424 kbit. The fourth NFC standard, like the type A and B standards, is subordinate to the ISO 14443 standard. NFC transmission is close, the transmission speed is slow, then what advantage does it have? The biggest advantage of NFC is its cheapness, because it is a passive device, simply design a very simple circuit and a very small build, the coil design can be made into NFC tags, so the NFC tag is cheaper than imagination. In addition to the low cost advantage, by combining with smartphones and apps, NFC technology can bring great convenience to the lives of the vast majority of consumers, and people just need to take out smartphones to buy exchange information or buy tickets, a simpler and more efficient advantage and a better experience than traditional Bluetooth technology. I'm sure there will be more and more NFC technology coming into our lives in the next few years, and don't be too surprised if you see someone around to do anything with NFC technology in the future.