Adafruit FeatherWing Add-ons For All Feather Boards - Adafruit 2900, The Adafruit FeatherWing 128 x 32 OLED Add-ons give any Feather main board a 128 x 32 monochrome OLED display with 3 x user push buttons. All this takes just the 2 x I2C signals plus 2 x power lines. The OLED displays have individual LED pixels which generate their own light so there's no backlight and very high contrast. Even though the displays are only 25mm diagonally they're very clear and crisp, and the buttons let you create a mini user interface.Adafruit supply a free tutorial and library to get you started. Supplied as a fully assembled and tested display board plus strips of 0.1in. pitch pin headers for you to solder on as required. Adafruit 2900 FeatherWing OLED - 128x32 OLED Add-on For All Feather Boards