Support of handling GPIO Buttons has been removed as the used pins weren`t configurable and there are other mopidy extensions like https://pypi.org/project/mopidy-raspberry-gpio/ (configureable pins) for that purpose.

The originally used RFID Library was pi-rc522. This is abandoned and it is not working with a recent raspberry os. I replaced it with the mfrc522 library. This one is also abandoned but it still handles the simple read task which is required here properly.

Pummeluff is a Mopidy extension which allows you to control Mopidy via RFID tags. It is as simple as that:

• Register an action to an RFID tag
• Touch that tag on the RFID reader and the action will be executed

Thus, the Mopidy Pummeluff extension adds the following features to Mopidy:

• A radically simple web UI which can be used to manage the RFID tags
• A daemon which continuously reads RFID tags in the background and executes the assigned actions

There are several actions included, such as replacing the tracklist with a desired URI, setting the volume to a specific level or controlling the playback state.

To get the whole thing working, you need at least the following hardware:

• A Raspberry Pi 3 Model B
• An RC522 RFID module (RC522 on AliExpress for approx. USD 1)
• RFID tags (ISO 14443A & Mifare should work, 14443A tags on AliExpress for approx. 0.4 USD per tag)
• Female dupont jumper wires (female dupont jumper cables on AliExpress for approx. 1 USD)

Pummeluff also supports a status LED, which lights up when Pummeluff (i.e. Mopidy) is running. You can go with a separate LED, just make sure it can handle 3.3V or add a resistor. There are also push buttons with integrated LED's available, for example these 5V momentary push buttons on AliExpress.

Please connect the RC522 RFID module to the RPi as follows:

• RC522 pin 1 [SDA ] ––– RPi pin 24 [SPI0 CE0 ]
• RC522 pin 2 [SCK ] ––– RPi pin 23 [SPI0 SCLK]
• RC522 pin 3 [MOSI] ––– RPi pin 19 [SPI0 MOSI]
• RC522 pin 4 [MISO] ––– RPi pin 21 [SPI0 MISO]
• RC522 pin 5 [IRQ ] ––– not used
• RC522 pin 6 [GND ] ––– RPi pin 20 [ GND ]
• RC522 pin 7 [RST ] ––– RPi pin 22 [ GPIO 25 ]
• RC522 pin 8 [3.3V] ––– RPi pin 17 [3.3V PWR ]

Please have a look at the Raspberry Pi SPI pinout if you want to have a graphical view of the RPi GPIO pins.

If you want to have a status LED which is turned on when the RPi is running, you can connect an LED to a GND pin (e.g. pin 6) & to pin 8.

Before you can install and use Mopidy Pummeluff, you need to configure your Raspberry Pi properly.

We want to enable the SPI interface and give the mopidy user access to it. This is required for the communication to the RFID module. Enter this command:

sudo raspi-config

In the configuraton utility, Enable the SPI under 5 Interfacing Options – P4 SPI.

After that, add your mopidy user to the spi and gpio group:

sudo usermod -a -G spi,gpio mopidy

The recommended way to install Mopidy Pummeluff by using pip and thus by executing the following command:

sudo pip install mopidy-pummeluff

Alternatively, you can also install Mopidy Pummeluff from source, by running this command:

sudo su -
cd /usr/src
git clone https://github.com/confirm/mopidy-pummeluff.git
cd mopidy-pummeluff
python setup.py install

Activate and configure the Mopidy HTTP extension and make sure you can connect to the Web UI. The minimal config looks like this:

[http]
enabled = true
hostname = 0.0.0.0

Open the Mopidy Web UI (i.e. http://{MOPIDY_IP}:6680/). You should see a pummeluff web client which can be used to regsiter new RFID tags.

Please follow these development guidelines when contributing to this project.