La Table Lumineuse

This repository holds the C++ source code of the light table I've build for my daughters.

It is meant to run on a Raspberry PI and controls a LED strip as well as speakers.

The whole thing can be controlled from any device (tablet, phone) by connecting to its web page. It exposes a simple REST API (see handler.cpp for the exact list of support actions), so it would be easy to integrate it with other applications.

Installation

Build

On a fresh raspbian (I recommend raspbian lite),

$ sudo apt install build-essential cmake git libjsoncpp-dev libboost-system-dev libboost-thread-dev libboost-filesystem-dev

For sound support, install as well libsfml:

$ sudo apt install libsfml-dev

Then:

$ git clone https://github.com/skadge/table-lumineuse.git
$ cd table-lumineuse && mkdir build && cd build
$ cmake .. -DCMAKE_BUILD_TYPE=Release -DWITH_SOUNDS=ON
$ make
$ sudo make install

Installation/Configuration

First, enable the SPI port in raspi-config (available in Advanced options or Interfacing in more recent version of raspi-config).

TBD: $LANG=C ; $LC_ALL=C; $LD_LIBRARY_PATH=/usr/local/lib

Then you need a webserver to serve the HTML interface:

$ sudo apt install nginx

Then:

$ sudo ln -s `pwd`/html /var/www/table

And replace the default site definition /etc/nginx/sites-enabled/default with the following content:

server {
    listen 80;

    location / {
        root /var/www/table;
        try_files $uri $uri/ /index.html;
        expires 30d;
    }
}

Restart nginx:

sudo systemctl restart nginx

Start-up the table whenever the raspberrypi boots

$ cd config && sudo ln -s table /etc/init.d/table
$ sudo systemctl enable table

Marker tracking

For markers tracking, table-lumineuse uses the raspberrypi camera. You must install OpenCV:

$ sudo apt install libopencv-dev`

And then, the [https://sourceforge.net/projects/raspicam](raspicam library).

Finally, reconfigure the project with the option WITH_SPOT_TRACKING=ON and recompile:

$ cd build
$ cmake .. _DCMAKE_BUILD_TYPE=Release -DWITH_SOUNDS=ON -DWITH_SPOT_TRACKING=ON
$ make
$ sudo make install