• 1
    Download python and libraries

    Install python3 on the Raspberry

    Install python3 RPi GPIO library

    sudo apt-get install python3-rpi.gpio
    

     Download https://github.com/mxgxw/MFRC522-python -> replace print "" by print("")

    sudo python3 setup.py install
  • 2
    Install & configure MPD

    probably 

    sudo apt-get install mpd

    configure

    /etc/mpd.conf

    group "audio"
    auto_update "yes"
    
    audio_output {
            type            "alsa"
            name            "USB"
            device          "hw:0,0"        # optional
    
  • 3
    Enable SPI
    sudo raspi-config

     Interfacing options -> SPI enabled