Bought one of these to control the neopixel ring. It uses 3.3V logic but will work with the ring if the VIN to the ring is also 3.3V. Out of the box with PlatformIO (which I can't say about the original trinket) and the Adafruit Neopixel library. It also has a built in Dotstar RGB LED that works great with the Dotstar library. Great little board.
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