Open source hardware

What Is Open Source Hardware?

Open source hardware is a class of physical artifacts, including machines, electronic devices, and mechanical assemblies, whose design documentation has been publicly released so that anyone can study, make, modify, distribute, and sell products based on that design. The defining characteristic is not the hardware itself but the accessibility of its design files: schematics, bill of materials, printed circuit board layouts, and mechanical drawings are all made available in editable formats rather than compiled or obfuscated output. This distinguishes open source hardware from merely inexpensive or freely available products, where the internal design remains proprietary.

The concept is an extension of open source software principles to the physical domain. While software's "source code" is a text file that compilers transform into a runnable program, hardware's equivalent is a set of design artifacts that fabrication processes transform into tangible devices. The parallel is imperfect because replicating hardware requires materials, manufacturing equipment, and supply chains that do not have direct software analogs. Nevertheless, the legal and community norms borrowed from open source software have proved workable for hardware.

The Open Source Hardware Definition

The community-canonical statement of what qualifies as open source hardware is maintained by the Open Source Hardware Association (OSHWA). The OSHWA definition requires that the hardware's documentation be released under terms granting users the right to use, study, redistribute, and modify the design. It specifies that source files must be provided in the preferred format for modification, not merely as read-only exports, and that the license must not discriminate against persons, groups, or fields of endeavor. Hardware that meets these criteria may apply for OSHWA certification, which gives users verifiable confidence that a project conforms to the community definition. As of the mid-2020s, OSHWA had certified projects from designers in more than 45 countries.

Design Documentation and Licensing

Practical open source hardware projects center on the completeness of design documentation. A schematic showing electrical connections is necessary but not sufficient; a full release includes PCB layout files, enclosure models in an editable CAD format, firmware source code when applicable, and a bill of materials listing component part numbers. The license applied to these files is the legal instrument that grants downstream rights. Common choices include the CERN Open Hardware Licence, the Solderpad Hardware License, and the Creative Commons Attribution licenses, each with different conditions on derivative works. When a project includes firmware or driver software, that component typically carries its own open source software license alongside the hardware license covering the design files.

Relationship to Open Source Software and Community Practices

Open source hardware communities have adopted many of the collaborative practices developed in software: version control repositories, issue trackers, forking and pull-request workflows, and public chat forums for contributor coordination. Platforms such as GitHub host hardware design files alongside firmware, and distributed fabrication services allow remote contributors to order physical prototypes of a shared design without access to on-site fabrication equipment. Research published through IEEE Xplore on open source hardware spans topics from FPGA-based reconfigurable platforms to scientific instrumentation built on Arduino and similar microcontroller boards, reflecting the breadth of contexts in which the model has been applied.

Applications

Open source hardware has applications in a range of fields, including: