The Adafruit CRICKIT for the micro:bit lets you add more features to your robots than just motors and servos - while still being compact and affordable.
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, while still leaving lots of pins free for other devices!
Here's a few useful things from Adafruit to help you get a bit more out of your devices! Charge your lipo battery with uninterrupted power to your Raspberry Pi Keep your Raspberry Pi running uninterrupted with this Adafruit board - by charging a lithium polymer battery while connected to external power.
There's a range of different leads and prototyping boards for the BBC micro:bit - this post walks you through from the very basic to the more elaborate, and explains when you might want to use each type.