Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments. This Google Code project is the home for the development of the Arduino platform. For more information on using Arduino, see the Arduino homepage.

The Arduino software consists of a development environment (IDE) and the core libraries. The IDE is written in Java and based on the Processing development environment. Its source code can be found in the app/ directory. The core libraries are written in C and C++ and compiled using avr-gcc and AVR Libc. Their source is in the hardware/ directory.

To report a bug in or suggest a change to the Arduino software, please post to the issues list (or, if you prefer, the Software Bugs and Suggestions forum). Changes are also collected on the Arduino playground, where they are voted on by members of the community. Additionally, there's a to do list in the source tree: todo.txt.

Potential changes to the Arduino software (environment or core libraries) are discussed on the developers mailing list (archives).