WS2812 FX Library for Arduino and ESP8266
If you use LEDs like the WS2812 (RGB LEDs) you can use the WS2812FX library https://github.com/kitesurfer1404/WS2812FX and an Arduino nano to quickly make something with fancy led patterns. That is what I used to quickly (few minutes) create a prototype with fancy LED patterns. The library comes with many standard patterns and it only takes a few lines of code to get started. No buttons, buzzers or ordinary LEDs though.
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