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A library for emulating UART functionality in software on any available digital IO pins. Use this tag for questions regarding SoftwareSerial.

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Using SoftwareSerial along with FastLED library to control WS2812 LEDs

Another approach is to make the commands to change the pattern very short. Like, one letter/byte. This assumes that the patterns are stored on your Arduino, and you just choose which one to show. In o …
Simon A. Eugster's user avatar