RC522 with Raspberry Pi 2

Wiring RPi2 and RC522

The RC522 is a cheap RFID module that can read and write Mifare’s tags and being sold at several web stores, like eBay and included with many “starter kits” nowadays. Simply search RFID-RC522 (MF-RC522). The card reader and the tags communicate using a 13.56MHz electromagnetic field. (ISO 14443A standart tags)

Wiring up:

Below table shows the connection between RC522 and RPi2:

RC522 pin RPi2 pin nr RPi2 pin name
SDA 24 GPIO8
SCK 23 GPIO11
MOSI 19 GPIO10
MISO 21 GPIO9
IRQ Remark: Not connected
GND GND GND
RST 22 GPIO25
3.3V 1 3V3

Please note that the RPi2 has a 40 pin header (RPi1 has 25).

Wiring RPi2 and RC522

RPi2 steps:

We need to enable all the python libraries and the SPI interface on the RPi2 to get it working.

To install the python environment:

sudo apt-get install python-dev

enable spi interface:
Edit the file /boot/config.txt and add the following two lines:

device_tree_param=spi=on
dtoverlay=spi-bcm2708

To check if the SPI interface is working, please reboot the RPi and run the following instructions:

$ dmesg | grep spi

The output will look like:

[ 10.886588] bcm2708_spi 3f204000.spi: master is unqueued, this is deprecated
[ 10.901487] bcm2708_spi 3f204000.spi: SPI Controller at 0x3f204000 (irq 80)

Now download and install the SPI python library:

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

Now download and run the RC522 lib:

$ git clone https://github.com/rasplay/MFRC522-python.git
$ cd MFRC522-python
$ python read.py

The output will look like:

Card detected
Card read UID: 98,40,242,197,125

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