M5Stack U035 for use with M5Core

CardKB is a unit that can implement a full-featured QWERTY keyboard. Consider that you want to make some cool stuff that requires keyboard typing and interaction, but M5 core itself just have 3 buttons, here comes the flexible and powerful CardKB unit.

It also can achieve button combination(Sym+Key, Shift+Key, Fn+Key) and output richer key value. This unit communicates with M5Core through GROVE A port(IIC interface). The address is 0x5F.