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Add licences (CERN-OHL-S-2.0 for hardware, MIT for firmware/docs) and licence notes

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LICENSE
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CERN Open Hardware Licence Version 2 - Strongly Reciprocal
Preamble
CERN has developed this licence to promote collaboration among
hardware designers and to provide a legal tool which supports the
freedom to use, study, modify, share and distribute hardware designs
and products based on those designs. Version 2 of the CERN Open
Hardware Licence comes in three variants: CERN-OHL-P (permissive); and
two reciprocal licences: CERN-OHL-W (weakly reciprocal) and this
licence, CERN-OHL-S (strongly reciprocal).
The CERN-OHL-S is copyright CERN 2020. Anyone is welcome to use it, in
unmodified form only.
Use of this Licence does not imply any endorsement by CERN of any
Licensor or their designs nor does it imply any involvement by CERN in
their development.
1 Definitions
1.1 'Licence' means this CERN-OHL-S.
1.2 'Compatible Licence' means
a) any earlier version of the CERN Open Hardware licence, or
b) any version of the CERN-OHL-S, or
c) any licence which permits You to treat the Source to which
it applies as licensed under CERN-OHL-S provided that on
Conveyance of any such Source, or any associated Product You
treat the Source in question as being licensed under CERN-OHL-S.
1.3 'Source' means information such as design materials or digital
code which can be applied to Make or test a Product or to
prepare a Product for use, Conveyance or sale, regardless of its
medium or how it is expressed. It may include Notices.
1.4 'Covered Source' means Source that is explicitly made available
under this Licence.
1.5 'Product' means any device, component, work or physical object,
whether in finished or intermediate form, arising from the use,
application or processing of Covered Source.
1.6 'Make' means to create or configure something, whether by
manufacture, assembly, compiling, loading or applying Covered
Source or another Product or otherwise.
1.7 'Available Component' means any part, sub-assembly, library or
code which:
a) is licensed to You as Complete Source under a Compatible
Licence; or
b) is available, at the time a Product or the Source containing
it is first Conveyed, to You and any other prospective
licensees
i) as a physical part with sufficient rights and
information (including any configuration and programming
files and information about its characteristics and
interfaces) to enable it either to be Made itself, or to
be sourced and used to Make the Product; or
ii) as part of the normal distribution of a tool used to
design or Make the Product.
1.8 'Complete Source' means the set of all Source necessary to Make
a Product, in the preferred form for making modifications,
including necessary installation and interfacing information both
for the Product, and for any included Available Components. If
the format is proprietary, it must also be made available in a
format (if the proprietary tool can create it) which is viewable
with a tool available to potential licensees and licensed under a
licence approved by the Free Software Foundation or the Open
Source Initiative. Complete Source need not include the Source of
any Available Component, provided that You include in the
Complete Source sufficient information to enable a recipient to
Make or source and use the Available Component to Make the
Product.
1.9 'Source Location' means a location where a Licensor has placed
Covered Source, and which that Licensor reasonably believes will
remain easily accessible for at least three years for anyone to
obtain a digital copy.
1.10 'Notice' means copyright, acknowledgement and trademark notices,
Source Location references, modification notices (subsection
3.3(b)) and all notices that refer to this Licence and to the
disclaimer of warranties that are included in the Covered Source.
1.11 'Licensee' or 'You' means any person exercising rights under
this Licence.
1.12 'Licensor' means a natural or legal person who creates or
modifies Covered Source. A person may be a Licensee and a
Licensor at the same time.
1.13 'Convey' means to communicate to the public or distribute.
2 Applicability
2.1 This Licence governs the use, copying, modification, Conveying
of Covered Source and Products, and the Making of Products. By
exercising any right granted under this Licence, You irrevocably
accept these terms and conditions.
2.2 This Licence is granted by the Licensor directly to You, and
shall apply worldwide and without limitation in time.
2.3 You shall not attempt to restrict by contract or otherwise the
rights granted under this Licence to other Licensees.
2.4 This Licence is not intended to restrict fair use, fair dealing,
or any other similar right.
3 Copying, modifying and Conveying Covered Source
3.1 You may copy and Convey verbatim copies of Covered Source, in
any medium, provided You retain all Notices.
3.2 You may modify Covered Source, other than Notices, provided that
You irrevocably undertake to make that modified Covered Source
available from a Source Location should You Convey a Product in
circumstances where the recipient does not otherwise receive a
copy of the modified Covered Source. In each case subsection 3.3
shall apply.
You may only delete Notices if they are no longer applicable to
the corresponding Covered Source as modified by You and You may
add additional Notices applicable to Your modifications.
Including Covered Source in a larger work is modifying the
Covered Source, and the larger work becomes modified Covered
Source.
3.3 You may Convey modified Covered Source (with the effect that You
shall also become a Licensor) provided that You:
a) retain Notices as required in subsection 3.2;
b) add a Notice to the modified Covered Source stating that You
have modified it, with the date and brief description of how
You have modified it;
c) add a Source Location Notice for the modified Covered Source
if You Convey in circumstances where the recipient does not
otherwise receive a copy of the modified Covered Source; and
d) license the modified Covered Source under the terms and
conditions of this Licence (or, as set out in subsection 8.3,
a later version, if permitted by the licence of the original
Covered Source). Such modified Covered Source must be
licensed as a whole, but excluding Available Components
contained in it, which remain licensed under their own
applicable licences.
4 Making and Conveying Products
You may Make Products, and/or Convey them, provided that You either
provide each recipient with a copy of the Complete Source or ensure
that each recipient is notified of the Source Location of the Complete
Source. That Complete Source is Covered Source, and You must
accordingly satisfy Your obligations set out in subsection 3.3. If
specified in a Notice, the Product must visibly and securely display
the Source Location on it or its packaging or documentation in the
manner specified in that Notice.
5 Research and Development
You may Convey Covered Source, modified Covered Source or Products to
a legal entity carrying out development, testing or quality assurance
work on Your behalf provided that the work is performed on terms which
prevent the entity from both using the Source or Products for its own
internal purposes and Conveying the Source or Products or any
modifications to them to any person other than You. Any modifications
made by the entity shall be deemed to be made by You pursuant to
subsection 3.2.
6 DISCLAIMER AND LIABILITY
6.1 DISCLAIMER OF WARRANTY -- The Covered Source and any Products
are provided 'as is' and any express or implied warranties,
including, but not limited to, implied warranties of
merchantability, of satisfactory quality, non-infringement of
third party rights, and fitness for a particular purpose or use
are disclaimed in respect of any Source or Product to the maximum
extent permitted by law. The Licensor makes no representation
that any Source or Product does not or will not infringe any
patent, copyright, trade secret or other proprietary right. The
entire risk as to the use, quality, and performance of any
Source or Product shall be with You and not the Licensor. This
disclaimer of warranty is an essential part of this Licence and a
condition for the grant of any rights granted under this Licence.
6.2 EXCLUSION AND LIMITATION OF LIABILITY -- The Licensor shall, to
the maximum extent permitted by law, have no liability for
direct, indirect, special, incidental, consequential, exemplary,
punitive or other damages of any character including, without
limitation, procurement of substitute goods or services, loss of
use, data or profits, or business interruption, however caused
and on any theory of contract, warranty, tort (including
negligence), product liability or otherwise, arising in any way
in relation to the Covered Source, modified Covered Source
and/or the Making or Conveyance of a Product, even if advised of
the possibility of such damages, and You shall hold the
Licensor(s) free and harmless from any liability, costs, damages,
fees and expenses, including claims by third parties, in relation
to such use.
7 Patents
7.1 Subject to the terms and conditions of this Licence, each
Licensor hereby grants to You a perpetual, worldwide,
non-exclusive, no-charge, royalty-free, irrevocable (except as
stated in subsections 7.2 and 8.4) patent license to Make, have
Made, use, offer to sell, sell, import, and otherwise transfer
the Covered Source and Products, where such licence applies only
to those patent claims licensable by such Licensor that are
necessarily infringed by exercising rights under the Covered
Source as Conveyed by that Licensor.
7.2 If You institute patent litigation against any entity (including
a cross-claim or counterclaim in a lawsuit) alleging that the
Covered Source or a Product constitutes direct or contributory
patent infringement, or You seek any declaration that a patent
licensed to You under this Licence is invalid or unenforceable
then any rights granted to You under this Licence shall terminate
as of the date such process is initiated.
8 General
8.1 If any provisions of this Licence are or subsequently become
invalid or unenforceable for any reason, the remaining
provisions shall remain effective.
8.2 You shall not use any of the name (including acronyms and
abbreviations), image, or logo by which the Licensor or CERN is
known, except where needed to comply with section 3, or where the
use is otherwise allowed by law. Any such permitted use shall be
factual and shall not be made so as to suggest any kind of
endorsement or implication of involvement by the Licensor or its
personnel.
8.3 CERN may publish updated versions and variants of this Licence
which it considers to be in the spirit of this version, but may
differ in detail to address new problems or concerns. New
versions will be published with a unique version number and a
variant identifier specifying the variant. If the Licensor has
specified that a given variant applies to the Covered Source
without specifying a version, You may treat that Covered Source
as being released under any version of the CERN-OHL with that
variant. If no variant is specified, the Covered Source shall be
treated as being released under CERN-OHL-S. The Licensor may also
specify that the Covered Source is subject to a specific version
of the CERN-OHL or any later version in which case You may apply
this or any later version of CERN-OHL with the same variant
identifier published by CERN.
8.4 This Licence shall terminate with immediate effect if You fail
to comply with any of its terms and conditions.
8.5 However, if You cease all breaches of this Licence, then Your
Licence from any Licensor is reinstated unless such Licensor has
terminated this Licence by giving You, while You remain in
breach, a notice specifying the breach and requiring You to cure
it within 30 days, and You have failed to come into compliance in
all material respects by the end of the 30 day period. Should You
repeat the breach after receipt of a cure notice and subsequent
reinstatement, this Licence will terminate immediately and
permanently. Section 6 shall continue to apply after any
termination.
8.6 This Licence shall not be enforceable except by a Licensor
acting as such, and third party beneficiary rights are
specifically excluded.
LICENSE.MIT
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MIT License
Copyright (c) 2026 Hannes Gehrmann
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the
following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
THE USE OR OTHER DEALINGS IN THE SOFTWARE.
README.md
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├── bom/ bill of materials (CSV)
├── docs/ schematic PDF, layer plots, 3D render
├── firmware/ ESPHome configuration
└── photos/ photographs of the assembled board
├── photos/ photographs of the assembled board
├── LICENSE CERN-OHL-S-2.0 (hardware)
└── LICENSE.MIT MIT (firmware config, BOM, docs)
```
## Rebuilding the board
@@ -156,6 +158,20 @@ S8 UART: 9600 baud, 8N1. BME280 I²C: standard address `0x76` (or `0x77` dependi
## License
Not chosen yet. Recommended for a published open-hardware module:
**CERN-OHL-S-2.0** for the hardware (schematic, layout, footprints) and **MIT** for the firmware
configuration and scripts. A `LICENSE` file must be added before publishing.
Dual licensed, SPDX identifiers:
| Scope | Licence | File |
|---|---|---|
| Hardware: schematic, layout, symbols, footprints, fabrication data | **CERN-OHL-S-2.0** (CERN Open Hardware Licence v2, strongly reciprocal) | [`LICENSE`](LICENSE) |
| Firmware configuration, BOM, scripts, documentation | **MIT** | [`LICENSE.MIT`](LICENSE.MIT) |
SPDX notices to keep in derived files:
```
SPDX-License-Identifier: CERN-OHL-S-2.0
SPDX-FileCopyrightText: 2026 Hannes Gehrmann
```
Making a board from these files and distributing it is explicitly allowed; if you modify the design
and convey it, CERN-OHL-S requires you to publish the modified design under the same licence and to
mark what you changed (sections 3.2 and 3.3).