Add hardware license, gitignore, README structure, and project folders

.gitignore

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+# Build files for C/C++
+build/
+*.o
+*.bin
+*.hex
+*.elf
+
+# KiCad backup files
+*-cache.lib
+
+# Common OS/IDE files
+.DS_Store
+.vscode/

HARDWARE-LICENSE.md

@@ -0,0 +1,265 @@
+CERN Open Hardware Licence Version 2 - Strongly Reciprocal
+
+Preamble
+
+CERN has designed this licence to provide a legal tool to foster
+collaboration and sharing among hardware designers. Version 2 of the CERN
+Open Hardware Licence comes in three variants: CERN-OHL-P (permissive); and
+two reciprocal licences: this licence, CERN-OHL-S (strongly reciprocal) and
+CERN-OHL-W (weakly 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.
+
+  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 licence 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.

README.md

@@ -1,2 +1,12 @@
-# Altimeter_Lift
+# Lift Altimeter
+
+## Summary
+
 Meet Lift: the smallest, affordable, open-source altimeter for model rockets. Get useful data without compromising safety. Features include reverse polarity protection, low power shut off, highly power efficient, a 320g accelerometer, and a barometer. A tuned Extended Kalman filter ensures clean, robust data, making Lift a feature-rich choice.
+
+## Features
+
+## License
+
+* **Software:**  GPLv3 (see LICENSE file).
+* **Hardware:** CERN-OHL-S v2 (see HARDWARE-LICENSE.md).