How to use RC522 card reader chip?

Obviously, you can't use a bus card.

Since you have come into contact with RFID, you should know that in fact, all smart chips have a password to control the access to data, and if there is no corresponding password, it cannot be accessed, let alone write.

Obviously, you can't grasp the password of the bus card... Unless you're the bus company that's in charge of the technology, or the company that's providing the system to the bus company, hehe.

The white card does not mean that there is no printed blank card, but that there is no initialized blank card, that is, the card that has just left the factory, and the initial test password of the contactless IC card is generally 12 "F".

Good luck with your studies.

You can only use a white card.,Pro.。。 Ask for points.

mifare（s50、s70、pro、ultralight）、desfire、fm11rf08。。。

Any card that complies with the ISO 14443A protocol can be read.

SCM and host computer serial port communication, need the single-chip microcomputer serial port baud rate and host computer serial port baud rate to be consistent, single-chip microcomputer and RC522 IC card reading chip is SPI communication, that is, the host computer to the single-chip microcomputer to the single-chip computer to send card reading instructions single-chip through the card reading program control RC522, read close to the card reading chip IC card data, through the serial port upload to the host computer.

The CPU card does not write cos, which is equivalent to the computer not following the system, and no matter how you boot it, you can't enter the system.

Hello landlord.,I've been working on a CPU card recently.,But there's no eyebrows.,Can you ask the landlord to help?

Professional Answer:

1: The RFID of the bus or garage door is always in the reading state.

2: The power-saving mode of RC522 can save power and is used in places with strict battery requirements, such as not working in the middle of the night, etc.

3: After the RC522 is saved, the card cannot be woken up, and the card can only be swiped when the MCU restores the RC522 normal mode.

1: You have to develop according to the DLL library provided by the module equipment vendor, and the library functions of each enterprise are different, so there is no way to help you.

3: If you want to do data interaction, of course, you have to verify the sector password.

4: Personal suggestion, you can read the 14443a protocol when you have time, which details the operation for the card.

The MF RC522 is part of a family of highly integrated read/write card chips for contactless communications. It is a low-voltage, low-cost, small-size contactless read-write card chip launched by NXP for the "three-meter" application, which is a good choice for the research and development of smart meters and portable handheld devices. As a new member of the family of highly integrated read/write card chips, the MF RC522 shares many similarities with the MF RC500 and MF RC530, as well as many features and differences.

The communication between it and the host adopts serial communication with fewer connections, and one of the SPI, I2C or serial UART (similar to RS232) modes can be selected according to different user needs, which is conducive to reducing the connection, reducing the size of the PCB board, and reducing the cost.