Arduino enthusiasts looking for ... Clock , EEPROM, SD, buzzer, NRF24 plug, LCD, RGB led, rotary encoder, buttons. Maybe interested in the InvIoT U1 which has been created by Dimitri Synodinos.

You can read the state of a button using Arduino and a few lines of code. The actual state is shown in the Serial Monitor window as 0 or 1, 0 meaning the button is not pressed and 1 that the button is ...