This complex contraption is actually an interactive story telling device. From Niklas Roy:
“Smart Fairy Tale” is a remote controlled story machine. A little red ball rolls through a maze of transparent pipes. Interrupting light barriers along its way, the ball triggers the movements of numerous animatronics. Different track switches inside the pipe system determine the path of the ball, leading to a variety of stories which are being told by the apparatus. Visitors can operate the installation via their smartphones.
The server of the installation is a Raspberry Pi. Via its GPIOs it controls the track switches and releases the ball. Server and smartphones communicate via the WebSocket protocol, which updates all connected devices in real time. If one person hits a button, everyone else who is logged in sees the switch turning too, not only in the installation, but also on their phones.
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