Calunium: An ATMega1284 Arduino Clone – [via]
Whoa! Steve Marple has created Calunium, an Arduino clone built around the ATMega644/1284 chip. In addition to the larger memory and I/O that the ’1284 provides, he’s also integrated a DS1307 real-time clock and coin cell on-board, and broken out the footprint for an LM61 temp sensor. This is a really interesting project, and a nice looking one, too!
Calunium is Open Source Hardware, and you can get the board and schematic files over on GitHub.
Calunium: An ATMega1284 Arduino Clone - [Link]