At the heart of the Arduino platform is an AVR microcontroller ... chip with pre-charged bootloader! Atmega328-PU/ Atmega328P-PU – 1 16Mhz Xstal – 1 22pF Ceramic Capacitor – 2 Small Breadboard / ...

It is one of our favorite chips, and the brains behind the Arduino UNO and its clones ... there’s a predictable kerfuffle on the forums. An Atmel representative said they can get you chips ...