Open-echo: open hardware and open source echosounding

this is a pretty cool open hardware and open source echosunder project. Still in development but pretty interesting at least: https://github.com/Neumi/open_echo

tesing video
some more info

copied from the Github:
An ongoing open-source software and hardware project about building a sonar for testing, boating, bathymetry and research. Current hardware can drive a variety of commercial and DIY transducers and read RAW and interpreted distance/depth data. A python software interface lets you connect to Open Echo boards and read data and change settings.

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Oh this is awesome! Super interested in trying out the dev version!