How to Turn Music Into Colors With a Wi-Fi Bridge#MusicMonday
https://blog.adafruit.com/2016/08/01/how-to-turn-music-into-colors-with-a-wi-fi-bridge-musicmonday/
_Several years ago, I wrote an algorithm I called ColorChord, which assigned colors to notes. The neat thing about it was that every time I played a note, the same color was assignedregardless of the octave. By using these color values to control LEDs, I had a whole new way to visualize chords and melodies. Sadly, the algorithm was a bit clunky. The Pentium-based processors available at the time had difficulty running the algorithm in real time, forcing me to use specialized graphics processors._
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_The ESP8266 uses a Tensilica processor core, factory-set to 80 MHz but overclockable to 160 MHz. Its features include general-purpose input/output ports (GPIOs), Integrated Interchip Sound (I2S) interfacing with direct memory access (DMA) for speedy data transfers, hardware support for pulse-width modulation, and an analog-to-digital converter (ADC). It’s possible to make Internet of Things devices and servers possessing rich Web-based-configuration graphical-user interfaces with code running on the ESP. And with WebSockets, applications running on the ESP can provide updates to and receive input from remote users at a rate of over 600 hertz._
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https://blog.adafruit.com/2016/08/01/how-to-turn-music-into-colors-with-a-wi-fi-bridge-musicmonday/