Expand the functionality of your micro:bit, Adafruit Circuit Playground Express, and Feather with the Crickit! Add additional simple sensors, motors. servos, multicoloured LEDS, speakers, switches, capacitive touch and more!
Circuit Python and MakeCode is available for the Circuit Playground Express, and there's MakeCode support for the micro:bit so far.
The Crickit is a SeeSaw board driven via I2C which basically means it uses two wires for communications, and two for power/ground - leaving plenty for other devices such as OLED screens.