After a very slow start, I finally started making some headway with my final!
First I made a simple Coqui circuit:
Here’s a video showing the working circuit. I used a photocell as the resistance slowly as proof-of-concept. The piezo has a lower frequency the more light is blocked from the piezo.
Then I created a second iteration. I wanted to do away with the Arduino so this could work without a microcontroller. I wired up a 9V battery and then had a standalone circuit that didn’t needed to be plugged in.
I also decided to create a sensor probe with a recycled water bottle, again following the documentation created by the lovely people at Public Labs. This required me to take an empty (recycled) water bottle, cut it in two, and screw two screws into the lid. I then attached alligator clips to the screws which will later be attached to Coqui. Eventaully, I’ll be able to put the whole bottle in the ocean!