I wanted to build a TinyML model that could detect when a boat is nearby by listening for it on a hydrophone. Edge Impulse makes it easy to build ML Models that can run on an Arduino board and detect events in audio. The tricky part ended up being how to connect a hydrophone to an Arduino board. I looked around but didn’t see any existing boards for powering and amplifying a microphone, like the hydrophone… so I decided to build one!
One of the the things I love about Adafruit is that they make there board designs available open source. I was able to take this design, move it over the the Feather form factor and add a 3.5mm jack instead of the microphone.
The custom FeatherWing board interfacing to the hydrophone is plugged into the back of an Adafruit Edge Board or PyBadge, providing an inexpensive microcontroller and display interface for the setup.
The code and FeatherWing design files are in the GitHub repo.
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