Thanks Peter.
the project might even still be waterproof as well.
I wonder about that. I'm sure the ultrasonics won't work THROUGH the lens. I wonder how "Moisture Proof" they are.
There are car sensors that use ultrasonics for parking and collision avoidance, and they must be Out There in the elements?
Anyone know about the 'waterproof' issue? Semi-waterproofing the existing low-cost sensors? Waterproof transducers that could be interfaced to the low-cost electronics?
Other: Anyone seen any cool audio-frequency echo stuff done with Arduino? I'd like to work out a project that schools could use to show the principles behind this. A friend who teaches 5th grade here in Vermont has the kids go outside in between class changes and clap at the building wall from 200 feet away to hear the distinct echo. Doing that with a microphone and oscilloscope would be cool. Hmmmm...
I like questions. Once in a while I get an answer 