**Our pledge**: many fields within Geosciences are relying on in-situ data collection. Traditionally, collecting in-situ data is expensive, with commercial instruments easily reaching several thousands of USDs even if only quite simple functionalities are provided. However, the recent emergence of open source communities within micro controllers and low level firmware for these opens new possibilities for developing low-cost, high performance instruments based on widely available and affordable components. This repository is focusing on developing an oceanic buoy based on such open source code and low cost components. Our solution is around 10 times cheaper than the least expensive similar commercial instrument we know of, and is actually superior to the commercial instrument in a number of regards, for example, for measurement in the polar regions. We hope that the present open source release, beyond sharing the design of our specific instrument, will encourage many more actors to share their developments within in-situ instrumentation and participate in building an open source community around geophysical instrumentation.
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