QR code and RFID

[QR code]

It is a new generation of bar code technology that records data symbol information using black and white rectangular phalanx distributed in a plane (two-dimensional direction) according to a certain rule, it consists of a QR code matrix and a QR code number, as well as the instructions below. You can read a large amount of information in the QR code through a dedicated QR code reading device or smartphone. It features a large amount of information, strong error correction ability, fast reading speed, and comprehensive reading. And
Compared with RFID, switching from a QR code to a QR code requires almost no additional cost in addition to printing.

[RFID]

Multiple tags can be identified at a time. The tags have strong anti-pollution ability and durability, and have the advantages of penetration and no barrier reading, and can be reused. The essence is wireless data exchange. This data exchange process requires two devices, one capable of reading and writing RF data, the data used for storing and writing data and RFID tags on chips containing antennas can be modified repeatedly, which can be used repeatedly within the enterprise to convert one-time costs into long-term amortized costs. It can also be used in harsh environments that one-dimensional two-dimensional bar code technology cannot adapt to, such as high dust pollution and field environments.

Working Principle The basic working principle of RFID technology is not complex: After a tag enters the magnetic field, it receives the RF signal from the interpreter and sends the product information stored in the chip based on the energy obtained by the induction current ( Passive Tag , Passive Tag or Passive Tag), or a signal at a certain frequency ( Active tag (Active or active tags). The interpreter reads and decodes the information and sends it to the central information system for data processing. RFID tags are divided into passive, semi-passive (also called semi-active), and active. Passive The passive label does not have an internal power supply. The internal IC is driven by the electromagnetic waves received by the RFID reader. When a tag receives a signal of sufficient strength, it can send data to the reader. The data includes not only the ID (globally unique ID), but also the data pre-existing in the eeprom of the label. Because passive tags have the advantages of low price, small size, and no power supply. RFID tags in the market are mostly passive. Semi-active Generally, a passive tag antenna has two tasks: first, to receive the electromagnetic wave sent by the reader, to drive the tag IC; second, to return the signal from the tag, the Antenna Impedance must be switched, in order to generate a change of 0 and 1. The problem is that if you want the best return efficiency, the Antenna Impedance must be designed in "open and short circuit", which will completely reflect the signal and cannot be received by the tag IC, semi-active tags are designed to solve such problems. The Semi-active mode is similar to the passive mode, but it has a small battery while the power supply can drive the label IC, making the IC in the working state. The advantage is that the antenna can be used as a return signal without the need to receive electromagnetic waves. Compared with passive systems, semi-active systems have a faster response speed and better efficiency. Active Unlike passive and semi-passive, the active label itself has an internal power supply to supply the power needed by the internal IC to generate external signals. Generally, active tags have a long read distance and a large memory capacity to store some additional messages sent by the reader. RFID technology includes a complete set of information technology infrastructure, including: RFID tags, also known as RF tags, electronic tags, mainly identified Code The large-scale integrated line chip and transceiver antenna are mainly passive, and the power used is derived from the radio wave energy received by the antenna. RFID read/write equipment and the corresponding information service system, such as online storage and sales systems. Compared with Barcode Technology, RFID has many advantages, such: it can accommodate a large amount of capacity, long communication distance, difficult to copy, have a high degree of endurance to environmental changes, and can read multiple tags at the same time. The disadvantage is that the construction cost is high. However, with the extensive use of this technology, production costs can be greatly reduced.

 

Note: RFID tags have chips that emit electromagnetic signals.

To sum up,The bar code technology is only responsible for recording information, and then it does not matter. Other tasks are to read the information. No matter what means to read the information, it is the simplest direct lens reading, there are still penetrating devices to read data (such as supermarkets ).

RFID has its own chip, which not only records things, but also sends signals externally when there is energy. Take the initiative to read your own information to others.

 

To put it bluntly, RFID is a simple device, and barcode is a word.