Adafruit-0-56-4-Digit-7-Segment-Displays-with-I2C-Backpack-Adafruit-878-P-These-Adafruit-Red-4-Digit-7-Segment-Displays-take-the-pain-out-of-using-7-segment-displays-by-including-an-I2C-backpack-to-do-the-constant-current-driving-&-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-Se