The ATMega328 doesn’t have enough pins to do this the normal way, so all the LEDs will be Charlieplexed. A keyboard for emoticons demands custom keycaps, but [Duncan] is having a hard time ...

An emoticon is a blend of ‘emotion’ and ‘icon’, made up of characters from a keyboard, whereas an emoji (a combination of the Japanese ‘e’ for ‘picture’ and ‘moji’ for ...