>A colored floating ball in a vertical tube parallel to the main tank will give
>you depth indication.  Getting that visual indicator into the micro will be a
>challenge...

if the little coloured ball is opaque then it would be pretty easy to put an IR led and a photo
transistor either side of the tube. if daylight is a problem you could put the tube inside the sub,
or use daylight filtered opto parts, or pulse the IR led and do a comparison with the ambient level.
or whatever.

Regards,
Simon

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST