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[Reply #15 on:]

haha!  Yes spying on hotel guest in the hotel pool wouldn't be smart.  I was thinking more development in the pool and later be able to spy on fish or other water creatures after development.  Of course to use a camera like I'm saying I'd need the Rasberry Pi and a piece of developed film over the lens to get my x-ray vision on!  If I had a BT module sealed in a tupperware float would it still be able to communicate close to 10 meters?  What if I vacuumed sealed the BT Module with piece of Styrofoam using the Food Saver Vacuum Sealer?  Then some silicone epoxy or Gorilla glue epoxy to water proof around wires.

BTW, tonight I tried to listen to a loud stereo from underwater and could barely hear a thing.  I can understand why the same goes for IR waves lengths.  It's like hitting a thick brick wall.

I'm thinking about giving an IR receiver or BT module commands at sea level which would send the submarine into a deep dive for 10 seconds in whichever direction I've chosen.  Commands like dive for 5 seconds and then swim up for 5 seconds, or dive for 5 seconds and turn right for 5 more seconds, or dive for 5 seconds and turn left for 5 more seconds.

[Reply #16 on:]

What if you got some epoxy and sealed water tight a piezo speaker, have it generate different tones and depending on the tone, it performs different actions?  Dolphis and Wales use sound waves... right?

[Reply #17 on:]

Dolphis and Wales use sound waves... right?

Yes but they are not sealed in epoxy are they?

[Reply #18 on:]

What if you got some epoxy and sealed water tight a piezo speaker, have it generate different tones and depending on the tone, it performs different actions?  Dolphis and Wales use sound waves... right?

I just bought some Gorilla Glue Epoxy.  I'm not sure I quite understand your idea.  I'm thinking a piezo buzzer facing out of the hull and transmitting sound waves to sea creatures to see if they respond?.  lol

[Reply #19 on:]

I'm also start working on making a submarine using an 38kHz. I read out interesting and informative threads. This will be helpful for me. Its dead easy and pretty difficult to go wrong. Thanks everyone...

[Reply #20 on:]

Its dead easy and pretty difficult to go wrong.

Are you Jeremy Clarkson?

Another problem with IR - put of your diving mask, and lie on your back on the bottom of a deepish swimming pool, looking straight up at the water's surface.
Due to total internal reflection, you'll see the world above as a circle, and then you'll see the reflection of bottom of the pool.
If your IR transmitter is outside this circle, you won't receive signal.