Easy Player

Easy Music Player

I made this as an elderly family member lost the ability to operate their CD-Player, and lost access to all their music.
It's just a music player that is very easy to use.
A traditional approach to the problem might use touchscreen and/or a few large buttons/knobs.
My approach employs nothing but an RFID card reader and a stack of cards with printed song-titles and pictures on them.
Touchscreens are not intrinsically easy to use; They require fine motor skill, interfaces lack tactile feedback, GUI elements are abstractions, and screens in general are unable to display all available (or required) information, and must make use of scrolling or paging which is another abstract concept (basically: "There are more things you cannot see but must know are there and must act correctly to show.")
Anyway, screens are not easy. Buttons are easier, but they must employ textual descriptions of abstract functionality or even worse, icons such as play/pause/stop/next/previous, I know people even of my own age who are struggling with these concepts.
So, what I've done is do away with all of that, and make an always-on device with no knobs (the "administrator" sets the volume), and the ability to play a single song of users choice.
Playback can not be stopped, but it is generally not required. Playback can be interrupted if another song is desired.

Instructions:
"Take the song you want to listen to, and place it on the music player."

Demonstration video

Demonstration video on youtube.com

Building it

If you build one, have questions or improve on the idea, drop me a message :)

Steps

  1. Prepare the hardware
  2. Download and configure the easyplayer software
  3. Install and configure linux on the raspberry pi
  4. Transfer the easyplayer software to the rapsberry pi

Requirements

Putting together the hardware

Picture of Raspberry Pi 1 in a DVD case Put your PI in a case, attach power, rfid-card reader and speakers, you're done..
Sorry, but that's about it, you could buy a USB power supply and a plastic case on E-Bay and it'd be just fine.

1. Prepare the RFID cards

Find out which songs you want to have selectable via cards, make some artwork for them.
I found pictures of the musicians and used as background, then added text.
Picture of the RFID card art ready for printing
I printed out the artwork in 2 copies (one for each side) and glued them to the RFID cards, even a single-side card printer is crazy expensive.


2. Preparing the easy-player software

Only a few steps are required to prepare the software.
I'm preparing it from my workstation, and will transfer it to the pi as the last thing in this guide (step 4).

  1. Acquire EasyPlayer script
  2. Acquire music
  3. Generate database
  4. Code cards to songs

Download and extract easyplayer.tar.bz2 678 Bytes (SHA256:376f992f6f2ab8fc7569a692e5bfcc20adc1b4e7a4ee97862544c0aa2702ecab).

easyplayer/
├── db.json
├── music
└── player.sh

Put your music in the easyplayer/music/ directory (it's no problem to have subdirectories, but avoid " characters in directory/file names)
Asunder is a great CD-ripper.
Generate the database, this is easily done with a one-liner (required awk, sed, cut and jq installed) from within the music directory:
echo "{$(find . -iname '*.mp3' | cut -c3- | awk '{ printf "\"%d\":\"%s\",\n",NR,$0 }'| sed '$ s/.$//')}" | jq . > ../db.json

Now you have a JSON file where each KEY is the line number, and the VALUE is the filename of the song.
Open the json file in your favorite editor and connect your RFID card reader to your workstation.
For each of your prepared rfid cards, remove the key for the corrosponding file and scan the card, so that the scanner inputs the id number.

Abbreviated example db.json
{"1":"./mics - Tyske schlager hits 2 cd1/20 - Roberto Blanco - Ein Bisschen spass muss sein.mp3",
"23208196":"./mics - Tyske schlager hits 2 cd1/18 - Freddy Breck - Überall auf der welt.mp3",
"11":"./mics - Tyske schlager hits 2 cd1/12 - Bernd Clüver - Der junge mit der mundharmonika.mp3",
"44":"./Gustav Winckler - Hans Største Hits - CD 1/Gustav Winckler - Hans Største Hits - CD 1.mp3.m3u",
"13220228":"./Gustav Winckler - Hans Største Hits - CD 1/03 - Gustav Winckler - Den Mørke Landevej.mp3",
"46":"./Gustav Winckler - Hans Største Hits - CD 1/14 - Gustav Winckler - Ingen Bryder Livets Cirkel.mp3",
"18428164":"./Hansi Hinterseer - Mine Favoritter (Ude Og Hjemme)/03 - Hansi Hinterseer - Hey Baby Tanz Mit Mir.mp3",
"245":"./André Rieu - Live!/08 - André Rieu - Cielito Linda.mp3"}

I ripped a few CD's (that this person legally own), and added all the music to the device and the database,
it allows me to prepare additional cards and an updated database in the future and upgrade it in a few minutes on-site.

3. Install linux on the pi

After installing the linux image, install alsa-utils and update /boot/config.txt.
Then create a user called "player" and configure it to automatic login to console.
Install the required software: alsa-utils, mpg123 and jq
pacman -S alsa-utils mpg123 jq

4. Transfer easyplayer to the pi

Mount your PI sd cards root partition under /mnt/
Copy everything from inside the "easyplayer" folder to the "player" users home directory ( cp -r easyplayer/* /mnt/home/player/ )
Add "./player.sh" (without the quotes) as the last line of "player" users .bashrc. ( echo ./player.sh >> /mnt/home/player/.bashrc )



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Last edited: 2016-07-24 - No need for a disclaimer, I've done nothing wrong!