Wonder if this can be used to maintain periscope depth instead of using pressure based sensor ?
Alternative Depth Controller
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Interesting... A few options:
The sonar is a really cool idea. It would have to be UNDER the water and not ABOVE like the video. The sonar would be upward-facing. Not sure what waves would do to that signal, but it feels like overall this could be a decent option.
I don't know how the resistive or capacitive strip boards would work. Perhaps if you are okay only staying at PD, you could use a periscope as the strip mounting surface. Of course, this is only useful if the periscope is at or above the surface...


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