Adafruit Crickit and Accessories
The Adafruit Crickit is an I2C board that expands the functionality of the micro:bit, Circuit Playground Express, and Feather. Since the board uses I2C, it only requires a minimal number of pins, as long as you have enough power for whatever you connect to it. There's custom blocks and libraries already written for you to get started, and simple sensors can also be read e.g. resistance or signal.
