MFRC522 and Raspberry Pi
Image Source: http://www.haoyuelectronics.com
Connecting the MFRC522 to RPI
This website has a nice diagram of the RPI pinout: https://pinout.xyz/pinout/pin22_gpio25
| MFRC522 | RPI | Physical Pin |
|---|---|---|
| SDA | 24 | GPIO8 |
| SCK | 23 | GPIO11 |
| MOSI | 19 | GPIO10 |
| MISO | 21 | GPIO9 |
| IRQ | None | None |
| GND | Any | Any Ground |
| RST | 22 | GPIO25 |
| 3.3V | 1 | 3V3 |
Raspberry Pi
Enable SPI with raspi-config. Menu > Interfacing Options > SPI
user@computer$ sudo raspi-config
Add the following to boot.txt with your favorite text editor.
device_tree_param=spi=on
dtoverlay=spi-bcm2708
user@copmuter$ sudo rpi-update
To read and write data to NFC tags you can use this python class: MRFC522 python. The next step is to install SPI-Py which is a dependency of MFRC522 python.
Cloning SPI-Py Github repo
user@computer$ git clone https://github.com/lthiery/SPI-Py
Cloning into 'SPI-Py'...
remote: Counting objects: 81, done.
remote: Total 81 (delta 0), reused 0 (delta 0), pack-reused 81
Unpacking objects: 100% (81/81), done.
Installing SPI-Py
user@computer$ sudo python SPI-Py/setup.py install
Downloading MFRC522 python
user@computer$ git clone https://github.com/mxgxw/MFRC522-python
Cloning into 'MFRC522-python'...
remote: Counting objects: 60, done.
remote: Total 60 (delta 0), reused 0 (delta 0), pack-reused 60
Unpacking objects: 100% (60/60), done.
Reading NFC tag
user@computer$ python MRFC522-python/Read.py
Welcome to the MFRC522 data read example
Press Ctrl-C to stop.
The MFRC522 should work now . . .
This error is raised after executing Read.py
fatal error: Python.h: No such file or directory compilation terminated.
Solution: install python-dev
user@computer$ sudo apt-get install python-dev #python 2
user@computer$ sudo apt-get install python3-dev #python 3