Adafruit-Bi-Colour-Red-Green-LED-Displays-with-I2C-Backpack-Kit-Adafruit-902-P-These-Adafruit-Square-Bi-colour-Red-Green-LED-1-2in-8x 8-Matrix-Displays-with-I2C-save-your-microcontroller-losing-all-its-GPIOs-to-multiplexing-Connecting-displays-like-this-can-be-quite-expensive-in-precious-GPIO-pins-but-with-the-added-backpack-they-only-use-the-2-x-I2C-signals-plus-2-x-power-connections-They-are-great-for-microcontrollers-with-limited-outputs-such-as-the-A-href-Search-query-Trinket-ATt