Class 4: LED Matrix Programming
Includes the following topics:

• How to wire a Neopixel / WS2811 / WS2812 LED matrix 
• How to translate XY coordinates to a linear array index (via FastLED's XYMatrix)
• How to use & experiment with the FastLED noise algorithm, and how to animate noise across a matrix using color palettes
• How to animate pixel / sprite / 8-bit art on an LED matrix
• How to use the FFT / Fast Fourier Transform algorithm to obtain sound spectrum data from Circuit Playground's sound sensor 
• How to visualize sound data: creating an interactive sound spectrum analyzer using the LED matrix