You are viewing a single comment's thread from:RE: Learn Arduino Create Exclusive Project [Part-02] :: Arduino Hardware and IDE ContactView the full contextphonixs (29)in #technology • 7 years ago (edited) External Power Supply , upto 7-12 volt yes, the ATmega328 microcontroller is used in Arduino UNo. USB Interface is used to connect the computer's USB port to load programs in Arduino Uno.