This is a compilation of extra platforms for Arduino's IDE.
- ATmega644P 16Mhz (Sourced from Sanguino project)
- ATmega1284P 16Mhz (Sourced from Mighty 1284P project)
- ATmega1284P 8Mhz (Sourced from Mighty 1284P project)
- Download the ZIP File
- Unzip it a folder called 'hardware' off your sketches directory, e.g. /Arduino/hardware/
- Restart the IDE
- Select Tools > Board > "Your Board"