Open-source hardware

Source: Wikipedia, the free encyclopedia.
OSHWA
, one of the main defining organizations
3D printer
with the ability to make copies of most of its own structural parts

Open-source hardware (OSH, OSHW) consists of physical

libre terms. The original sharer gains feedback and potentially improvements on the design from the FOSH community. There is now significant evidence that such sharing can drive a high return on investment for the scientific community.[3]

It is not enough to merely use an open-source license; an open source product or project will follow open source principles, such as modular design and community collaboration.[4][5][6]

Since the rise of reconfigurable

system-on-a-chip systems either in field-programmable gate arrays (FPGA) or directly in application-specific integrated circuit (ASIC) designs. HDL modules, when distributed, are called semiconductor intellectual property cores
, also known as IP cores.

Open-source hardware also helps alleviate the issue of

proprietary device drivers for the free and open-source software community, however, it is not a pre-requisite for it, and should not be confused with the concept of open documentation for proprietary hardware, which is already sufficient for writing FLOSS device drivers and complete operating systems.[7][8]
The difference between the two concepts is that OSH includes both the instructions on how to replicate the hardware itself as well as the information on communication protocols that the software (usually in the form of device drivers) must use in order to communicate with the hardware (often called register documentation, or open documentation for hardware[7]), whereas open-source-friendly proprietary hardware would only include the latter without including the former.

History

openhardware.org logo (2013)
OSHWA logo

The first hardware-focused "

ham radio operator. He launched the Open Hardware Certification Program, which had the goal of allowing hardware manufacturers to self-certify their products as open.[9][10]

Shortly after the launch of the Open Hardware Certification Program, David Freeman announced the Open Hardware Specification Project (OHSpec), another attempt at licensing hardware components whose interfaces are available publicly and of creating an entirely new computing platform as an alternative to proprietary computing systems.

Open Design
Definition. However, most of these activities faded out after a few years.

A "Free Hardware" organization, known as FreeIO, was started in the late 1990s by Diehl Martin, who also launched a FreeIO website in early 2000. In the early to mid 2000s, FreeIO was a focus of free/open hardware designs released under the GNU General Public License. The FreeIO project advocated the concept of Free Hardware and proposed four freedoms that such hardware provided to users, based on the similar freedoms provided by free software licenses.[13] The designs gained some notoriety due to Martin's naming scheme in which each free hardware project was given the name of a breakfast food such as Donut, Flapjack, Toast, etc. Martin's projects attracted a variety of hardware and software developers as well as other volunteers. Development of new open hardware designs at FreeIO ended in 2007 when Martin died of pancreatic cancer but the existing designs remain available from the organization's website.[14]

By the mid 2000s open-source hardware again became a hub of activity due to the emergence of several major open-source hardware projects and companies, such as

SparkFun, and Open Source Ecology
. In 2007, Perens reactivated the openhardware.org website, but it's currently (February 2025) inactive.

Following the

Open Hardware Foundation (OHF) in 2007.[15]

The

Tucson Amateur Packet Radio Corporation (TAPR), founded in 1982 as a non-profit organization of amateur radio operators with the goals of supporting R&D efforts in the area of amateur digital communications, created in 2007 the first open hardware license, the TAPR Open Hardware License. The OSI president Eric S. Raymond expressed some concerns about certain aspects of the OHL and decided to not review the license.[16]

Around 2010 in context of the

Freedom Defined project, the Open Hardware Definition was created as collaborative work of many[17] and is accepted as of 2016 by dozens of organizations and companies.[18]

In July 2011, CERN (

CERN OHL. Javier Serrano, an engineer at CERN's Beams Department and the founder of the Open Hardware Repository, explained: "By sharing designs openly, CERN expects to improve the quality of designs through peer review and to guarantee their users – including commercial companies – the freedom to study, modify and manufacture them, leading to better hardware and less duplication of efforts".[19] While initially drafted to address CERN-specific concerns, such as tracing the impact of the organization's research, in its current form it can be used by anyone developing open-source hardware.[20]

Following the 2011 Open Hardware Summit, and after heated debates on licenses and what constitutes open-source hardware, Bruce Perens abandoned the OSHW Definition and the concerted efforts of those involved with it.[21] Openhardware.org, led by Bruce Perens, promotes and identifies practices that meet all the combined requirements of the Open Source Hardware Definition, the Open Source Definition, and the Four Freedoms of the Free Software Foundation[22] Since 2014 openhardware.org is not online and seems to have ceased activity.[23]

The Open Source Hardware Association (OSHWA) at oshwa.org acts as hub of open-source hardware activity of all genres, while cooperating with other entities such as TAPR, CERN, and OSI. The OSHWA was established as an organization in June 2012 in Delaware and filed for tax exemption status in July 2013.[24] After some debates about trademark interferences with the OSI, in 2012 the OSHWA and the OSI signed a co-existence agreement.[25][26]

The

UK-based non-profit to promote and protect the open source silicon chip movement, roughly a year after the official release of RISC-V architecture.[27]

The

Four Freedoms.[28][29]

Forms of open-source hardware

Explainer video for Open Science Hardware

The term hardware in open-source hardware has been historically used in opposition to the term software of open-source software. That is, to refer to the electronic hardware on which the software runs (see previous section). However, as more and more non-electronic hardware products are made open source (for example WikiHouse, OpenBeam or Hovalin), this term tends to be used back in its broader sense of "physical product". The field of open-source hardware has been shown to go beyond electronic hardware and to cover a larger range of product categories such as machine tools, vehicles and medical equipment.[30] In that sense, hardware refers to any form of tangible product, be it electronic hardware, mechanical hardware, textile or even construction hardware. The Open Source Hardware (OSHW) Definition 1.0 defines hardware as "tangible artifacts — machines, devices, or other physical things".[31]

Electronics

Electronics is one of the most popular types of open-source hardware. PCB based designs can be published similarly to software as CAD files, which users can send directly to PCB fabrication companies to receive hardware in the mail. Alternatively, users can obtain components and solder them together themselves.

There are many companies that provide large varieties of open-source electronics such as

Adafruit, and Seeed. In addition, there are NPOs and companies that provide a specific open-source electronic component such as the Arduino electronics prototyping platform. There are many examples of specialty open-source electronics such as low-cost voltage and current GMAW open-source 3-D printer monitor[32][33] and a robotics-assisted mass spectrometry assay platform.[34][35] Open-source electronics finds various uses, including automation of chemical procedures.[36][37]

Chip design

RISC-V processor prototype, January 2013

Open Standard chip designs are now common.

OpenSparc (2005 - GPLv2), and RISC-V (2010 - Open Standard, free to implement for non-commercial purposes), are examples of free to use instruction set architecture
.

OpenCores is a large library of standard chip design subcomponents which can be combined into larger designs.

Complete open source software stacks and shuttle fabrication services are now available which can take OSH chip designs from

ASIC fabrication on maker-scale budgets.[38]

Mechanics

Purely mechanical OSH designs include mechanical components, machine tools, and vehicles. Open Source Ecology is a large project which seeks to develop a complete ecosystem of mechanical tools and components which aim to be able to replicate themselves.

Open-source vehicles have also been developed including bicycles like XYZ Space Frame Vehicles and cars such as the Tabby OSVehicle.

Mechatronics

Most OSH systems combine elements of electronics and mechanics to form mechatronics systems. A large range of open-source mechatronic products have been developed, including machine tools, musical instruments, and medical equipment.[30]

Examples of open-source machine tools include 3D printers such as

Lasersaur
.

Examples of open source medical equipment include open-source ventilators, the echostethoscope echOpen (co-founded by Mehdi Benchoufi, Olivier de Fresnoye, Pierre Bourrier and Luc Jonveaux[40]), and a wide range of prosthetic hands listed in the review study by Ten Kate et.al.[41] (e.g. OpenBionics' Prosthetic Hands).

Robotics

Open source robotics
combines open source hardware mechatronics with open source AI and control software. Due to the mixture of hardware and software it serves as a particularly active area for open source ideas to move between them.

Other

Examples of open-source hardware products can also be found to a lesser extent in construction (Wikihouse), textile (Kit Zéro Kilomètres), and firearms (

3D printed firearm, Defense Distributed
).

Licenses

Rather than creating a new license, some open-source hardware projects use existing,

patent law.[43]

Later, several new licenses were proposed, designed to address issues specific to hardware design.

BSD license
.

Despite superficial similarities to software licenses, most hardware licenses are fundamentally different: by nature, they typically rely more heavily on patent law than on copyright law, as many hardware designs are not copyrightable.[45] Whereas a copyright license may control the distribution of the source code or design documents, a patent license may control the use and manufacturing of the physical device built from the design documents. This distinction is explicitly mentioned in the preamble of the TAPR Open Hardware License:

"... those who benefit from an OHL design may not bring lawsuits claiming that design infringes their patents or other intellectual property."

— TAPR Open Hardware License[46]

Noteworthy licenses include:

The Open Source Hardware Association recommends seven licenses which follow their open-source hardware definition.

Creative Commons Attribution license.[52] Openhardware.org recommended in 2012 the TAPR Open Hardware License, Creative Commons BY-SA 3.0 and GPL 3.0 license.[53]

Organizations tend to rally around a shared license. For example,

GPL, and a proprietary license,[58] and the Balloon Project wrote their own license.[59]

Development

silkscreened on an unpopulated PCB

The adjective "open-source" not only refers to a specific set of freedoms applying to a product, but also generally presupposes that the product is the object or the result of a "process that relies on the contributions of geographically dispersed developers via the Internet."[60] In practice however, in both fields of open-source hardware and open-source software, products may either be the result of a development process performed by a closed team in a private setting or by a community in a public environment, the first case being more frequent than the second which is more challenging.[30] Establishing a community-based product development process faces several challenges such as: to find appropriate product data management tools, document not only the product but also the development process itself, accepting losing ubiquitous control over the project, ensure continuity in a context of fickle participation of voluntary project members, among others.[61]

The Arduino Diecimila, another popular and early open source hardware design

One of the major differences between developing open-source software and developing open-source hardware is that hardware results in tangible outputs, which cost money to prototype and manufacture. As a result, the phrase "free as in speech, not as in beer",[62] more-formally known as gratis versus libre, distinguishes between the idea of zero cost and the freedom to use and modify information. While open-source hardware faces challenges in minimizing cost and reducing financial risks for individual project developers, some community members have proposed models to address these needs[63] Given this, there are initiatives to develop sustainable community funding mechanisms, such as the Open Source Hardware Central Bank.

Extensive discussion has taken place on ways to make open-source hardware as accessible as open-source software. Providing clear and detailed product documentation is an essential factor facilitating product replication and collaboration in hardware development projects. Practical guides have been developed to help practitioners to do so.[64] Another option is to design products so they are easy to replicate, as exemplified in the concept of open-source appropriate technology.[65]

The process of developing open-source hardware in a community-based setting is alternatively called

here
for a delineation of these terms.

A major contributor to the production of open-source hardware product designs is the scientific community. There has been considerable work to produce open-source hardware for scientific hardware using a combination of open-source electronics and

3-D printing.[69][70][71]
Other sources of open-source hardware production are vendors of chips and other electronic components sponsoring contests with the provision that the participants and winners must share their designs. Circuit Cellar magazine organizes some of these contests.

Open-source labs

A guide has been published (

open-source electronics and 3D printing to make open-source labs
. Today, scientists are creating many such labs. Examples include:

Business models

Open hardware companies are experimenting with

photovoltaic industry has experimented with partnerships, franchises, secondary supplier and completely open-source models.[78]

Recently, many open-source hardware projects have been funded via crowdfunding on platforms such as Indiegogo, Kickstarter, or Crowd Supply.[79]

Reception and impact

open source software (see also Alternative terms for free software).[28]

Other authors, such as Professor

faculty.[82] Pearce in partnership with Elsevier introduced a scientific journal HardwareX
. It has featured many examples of applications of open-source hardware for scientific purposes.

Further, Vasilis Kostakis [et] et al[83] have argued that open-source hardware may promote values of equity, diversity and sustainability. Open-source hardware initiative transcend traditional dichotomies of global-local, urban-rural, and developed-developing contexts. They may leverage cultural differences, environmental conditions, and local needs/resources, while embracing hyper-connectivity, to foster sustainability and collaboration rather than conflict.[83] However, open-source hardware does face some challenges and contradictions. It must navigate tensions between inclusiveness, standardization, and functionality.[83] Additionally, while open-source hardware may reduce pressure on natural resources and local populations, it still relies on energy- and material-intensive infrastructures, such as the Internet. Despite these complexities, Kostakis et al argue, the open-source hardware framework can serve as a catalyst for connecting and unifying diverse local initiatives under radical narratives, thus inspiring genuine change.[83]

OSH has grown as an academic field through the two journals Journal of Open Hardware (JOH) and HardwareX. These journals compete to publish the best OSH designs, and each define their own requirements for what constitutes acceptable quality of design documents, including specific requirements for build instructions, bill of materials, CAD files, and licences. These requirements are often used by other OSH projects to define how to do an OSH release. These journals also publish papers contributing to the debate about how OSH should be defined and used.

See also

References

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Further reading
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