Make your shelf play MP3s!
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README.md

RfidShelf

Make your shelf play MP3s!

Use some cheap hardware (Esp8266/NodeMcu, RC522, VS1053 MP3 breakout board) to create an RFID controlled MP3 (and more) shelf. Impression of the first prototype:

RfidShelf Prototype

RfidShelf in action

This is how the first "test subject" reacted:

RfidShelf Test

The idea

When I was a little child I loved my tapes, vinyls and later CDs. Choosing my own music or listening to Pumuckl all day. Nowadays everything is available as MP3 which makes it hard for little kids to choose their own music. Since I wanted to give my son the same possibilities I decided to start this project:

Rfid cards can the be assigned a folder containing MP3 files on a SD card, played when the card is put on the shelf. Using some creativity (and/or the Internet and a printer) those cards can be customized to represent their content, giving the kid the ability to distinguish them. A WiFi web interface gives you the ability to manage the files on the shelf and to program the cards.

Features

  • Easy to use: kids proof!
  • Safe: No wiring on the outside, just a USB cable going in
  • Cheap: ~ 30€ depending on the parts you choose
  • Easy to manage: Web interface to configure everything needed

Repository structure

  • /Fritzing contains the sources for the wiring diagram
  • /RfidShelf Arduino/platformio sources for building the firmware
  • /RfidShelf/build/ current firmware image
  • /ShelfBoard KiCad source files for the shelf board pcb
  • /ShelfBoard/gerber current shelf board gerber files

Tools required

  • Electric drill
  • Hole saw (if you don't have one, you can get it at ikea together with the shelf)
  • Soldering iron
  • Long, stable screw driver or something similar

Hardware

I tried a variety of hardware combinations both focusing on being cheap and easy to assemble. Based on that I can recommend a few setups, depending on your budget and your ability/willingness to solder. Most items can be bought on Aliexpress for a few bucks, the links are only meant to be an example.

Common for all:

Some light soldering is required to attach the pin headers to the MFRC-522

Cheap (~30€)

Disclaimer: I had some noise issues with this version, probably due to all the wires flying around. Some more light soldering is required to attach the pin headers to the amplifier.

ShelfBoard based (~40€)

The ShelfBoard comes in 4 pack when ordered at PCBs.io, so if you build more shelves or share with someone else, the price is quite good. Components are the same as for the "cheap" version, but instead of the base plate use the following:

Easy (~45€)

The Adafruit board offers a good sound quality and already has an amp on board. Be sure to by the correct board, there is also a version without the amp, but a phone jack instead!

Wiring

Wiring (See /Fritzing folder for vector/svg version if this image) RfidBoardAdafruitWiring

Build instructions

See hardware instructions

Random Notes

  • Instead of cards you can also use those blue key fob Rfid tags, like the one included in most MFRC-522 kits. Maybe you can "implant" it into a teddy or something similar.
  • Neutrik NAUSB-W seems to be a great alternative for the USB port if manage to get it for a fair price at ebay. It fits a round whole and therefore is easier to mount into the shelf.

Disclaimer

Everything in this project I did up to my best knowledge. Nevertheless this comes without guarantee. Do not hold me responsible in case something unexpected/undesired happens.

Build Status