The ATmega is, after all, the biggest DIP package AVR makes, featuring 64k flash and 4k RAM (both four times as much as an Arduino) and 32 I/O pins, which is 12 more than an Arduino. The video is ...

[jelengar] liked the ease of use of the Arduino, but wanted a much higher pin count. He set about converting the ATmega Controller for use with Wiring, the code that the Arduino IDE is based on.