The top of the fountain contains 96 individually-switchable solenoid valves. Each valve is connected to a relay, which is switched by an Arduino microprocessor. The sketch running on the arduino can run some simple patterns on it's own, such as a rotating buffer pattern. It also listens for Open Sound Control messages over a network connection, allowing the display to be driven by external software over a wifi connection.
In the video above, an iOS app drives the fountain in response to music. Another iOS app allows printing messages and other pre-rendered patterns.
The LED lights at the top of the fountain are also controllable via OSC, although they are not individually addressable. Currently, you can set the color and brightness of the entire strip via a color picker in one of the apps. Future plans are to integrate this feature more deeply with the sound responsive app.
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