If you want to add a keypad to your Arduino project, the options are pretty ... The keypad uses an onboard ATMega328P to scan the matrix for button presses, decode them, and send them via UART ...

But we can’t deny this Arduino calculator project by [Danko Bertović] would ... Of course, the star of the show is the ATmega328P microcontroller, which is mounted in a place of honor right ...