CardKB is a unit with an implemented full-featured QWERTY keyboard. Consider that you want make some cool stuff that require keyboard typing and interaction, but M5 core by itself only has 3 buttons, what can you do? introducing CardKB, the flexible and powerful keyboard unit.
CardKB 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 (I2C interface). The default Address is 0x5F.
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