https://www.tandyonline.com/adafruit-octows2811-adapter-for-teensy-3-1.html
Tandy - Adafruit OctoWS2811 Adapter for Teensy 3.1
This adapter board connects the Teensy 3.1 to up to thousands of WS2811/WS2812 (a.k.a NeoPixel) and compatible LEDs using the OctoWS2811 Library.
tandyadafruitadapterteensy