New lower price for Axon II ($78) and Axon Mote ($58).
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AFAIK underwater sonar sensors are too expensive for my price range (please correct me if I'm wrong - would much rather buy a manufactured product than hacking/building my own tacky equivalent). Because of this reason I'm leaning more to buying and waterproofing a MaxSonar Ultrasonic sensor, but I have no idea how feasible this idea is other than the fact that Admin mentioned himself toying with the idea (see link in OP). thanks
Admin really knows what he's talking about when it comes to underwater stuff. If you read through enough threads you'll find out he works with underwater bots for part of his living.
Question for either of you, if you know how deep you are, and you are using sonar, can you just ignore the pings that would come back from reflecting off of the surface since you'd be able to calculate how long it'd take for the ping to get there and back?
What happens when the object in front is the same exact distance that the robot is from the surface?
Can you get sonar that works at different frequencies so you can have multiple running at the same time?
It took us two years to reliably stop the water from leaking in all the time
Not trying to jack this thread, but while sodastreaming a bottle of water for my scotch, got this thought... If there's room aboard, A CO2 cartridge (they come in various sizes) with an electronically controlled valve and a similar valve in the hull, could be used to adjust the pressure going down and back up, to match the surrounding pressure and hence loosen the demands on waterproofing.