How to use RFID-RC522 on Raspbian

Before use RFID-RC522. Enable SPI Interface (Update 2018-09-28)

Current kernel in document (Raspbian GNU/Linux 9 Kernel Version 4.14.70-v7+ #1144)

Enable SPI Interface
- Use command

$ sudo raspi-config

select menu

5 Interfacing Options -> SPI -> Yes -> OK -> Finish

Or

- Edit on /boot/config.txt.

change this line

dtparam=spi=on

Reference : https://github.com/raspberrypi/firmware/tree/master/boot/overlays

Edit on /etc/modprobe.d/raspi-blacklist.conf

add # (comment) on line "blacklist spi-bcm2708"

#blacklist spi-bcm2708

Reboot Raspberry PI

sudo shutdown -r now

Re-Check SPI Interface software

$ dmesg | grep spi
[    5.408904] bcm2708_spi 20204000.spi: master is unqueued, this is deprecated
[    5.659213] bcm2708_spi 20204000.spi: SPI Controller at 0x20204000 (irq 80)

$ lsmod | grep spi
spidev                 16384  0
spi_bcm2835            16384  0

If you found, software is enabled.

Install Software for use RFID-RC522

Install python-dev

sudo apt-get install python-dev

Install SPI-Py (Hardware SPI as a C Extension for Python)

git clone https://github.com/lthiery/SPI-Py.git
cd SPI-Py
sudo python setup.py install

Install MFRC522-python

git clone https://github.com/mxgxw/MFRC522-python.git 

cd MFRC522-python 

Install Python RC522 library

$ git clone https://github.com/ondryaso/pi-rc522.git
$ cd pi-rc522
$ sudo python setup.py install

Install Pins between Raspberry PI and RFID-RC522

RFID-RC522 Pin	Raspberry PI Pin	Raspberry PI Pin name
SDA	24	GPIO8
SCK	23	GPIO11
MOSI	19	GPIO10
MISO	21	GPIO9
IRQ	18	GPIO24
GND	Any	Any Ground
RST	22	GPIO25
3.3V	1	3V3

You can test read card.

$ cd examples
$ python Read.py
Starting

If touch the card, it will display.

Detected: 10
Card read UID: XX,XX,XX,XX
Setting tag
Selecting UID [XX, XX, XX, XX, XX]

Authorizing
Changing used auth key to [XX, XX, XX, XX, XX, XX] using method B

Reading
Calling card_auth on UID [XX, XX, XX, XX, XX]
S1B0: [0, 0, 105, 36, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Deauthorizing
Changing auth key and method to None
^C
Ctrl+C captured, ending read.

And test write card.

$ python KeyChange.py
Starting

Detected: 10
Card read UID: XX,XX,XX,XX
Setting tag
Selecting UID [XX, XX, XX, XX, XX]

Authorizing
Changing used auth key to [255, 255, 255, 255, 255, 255] using method A

Writing modified bytes
Calling card_auth on UID [XX, XX, XX, XX, XX]
Changing pos 2 with current value 0 to 105
Changing pos 3 with current value 0 to 36
Changing pos 4 with current value 0 to 64
Writing [0, 0, 105, 36, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] to S1B0
Not calling card_auth - already authed
S1B0: [0, 0, 105, 36, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Calling card_auth on UID [XX, XX, XX, XX, XX]
Changing pos 0 with current value 0 to 18
Changing pos 1 with current value 0 to 52
Changing pos 2 with current value 0 to 86
Changing pos 3 with current value 0 to 120
Changing pos 4 with current value 0 to 150
Changing pos 5 with current value 0 to 146
Changing pos 6 with current value 255 to 15
Changing pos 7 with current value 7 to 7
Changing pos 8 with current value 128 to 143
Changing pos 9 with current value 105 to 105
Changing pos 10 with current value 255 to 116
Changing pos 11 with current value 255 to 0
Changing pos 12 with current value 255 to 82
Changing pos 13 with current value 255 to 53
Changing pos 14 with current value 255 to 0
Changing pos 15 with current value 255 to 255
Writing [18, 52, 86, 120, 150, 146, 15, 7, 143, 105, 116, 0, 82, 53, 0, 255] to S1B3
Changing auth key and method to None
Stopping crypto1

You can learning python code for use RFID read and write data.

MIFARE (MFRC522) datasheet : http://www.nxp.com/documents/data_sheet/MFRC522.pdf

Python RC522 library : https://github.com/ondryaso/pi-rc522

Example Project for use NFC and Raspberry PI

• Attendance system using Raspberry Pi and NFC Tag reader by Yim

http://www.instructables.com/id/Attendance-system-using-Raspberry-Pi-and-NFC-Tag-r/

Reference : 

Device Tree overlays of Raspberry PI Firmware

https://github.com/raspberrypi/firmware/tree/master/boot/overlays

Python RC522 library (PI-RC522)

https://github.com/ondryaso/pi-rc522

MIFARE (MFRC522) datasheet

http://www.nxp.com/documents/data_sheet/MFRC522.pdf

MFRC522-python (current not support in new firmware)

https://github.com/mxgxw/MFRC522-python

SPI-PY

https://github.com/lthiery/SPI-Py