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open-source electronics platform

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Arduino is an open-source physical computing platform based on a simple I/O board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing and MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free at


More info at

Bug reports and technical discussions

  • To report a bug in the software or to request a simple enhancement go to Github Issues

  • More complex requests and technical discussion should go on the Arduino Developers mailing list

  • If you're interested in modifying or extending the Arduino software, we strongly suggest discussing your ideas on the Developers mailing list before starting to work on them. That way you can coordinate with the Arduino Team and others, giving your work a higher chance of being integrated into the official release


If you think you found a vulnerability or other security-related bug in this project, please read our security policy and report the bug to our Security Team 🛡️ Thank you!

e-mail contact: [email protected]


Detailed instructions for installation in popular operating systems can be found at:

Contents of this repository

This repository contains just the code for the Arduino IDE itself. Originally, it also contained the AVR and SAM Arduino core and libraries (i.e. the code that is compiled as part of a sketch and runs on the actual Arduino device), but those have been moved into their own repositories. They are still automatically downloaded as part of the build process and included in built releases, though.

The repositories for these extra parts can be found here: - Non-core specific Libraries are listed under: (and also a few other places, see


Building and testing

Instructions for building the IDE and running unit tests can be found on the wiki: - -


Arduino is an open source project, supported by many.

The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe and David A. Mellis.

Arduino uses GNU avr-gcc toolchain, GCC ARM Embedded toolchain, avr-libc, avrdude, bossac, openOCD and code from Processing and Wiring.

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