Hi, if you are going to use a float I would use the sharp opto
distance sensor. They are only a few bucks, have a serial interface,
and give a pretty fine resolution up to about a meter max. You may need
to put a white flat surface disk on top of your float ball or choose
a float with a flat top.
There is some data on this Sharp sensor at:
http://www.tinaja.com/flut01.html
(see tech musings #131)
and there is a lot of data on this sensor on the net. I have never
worked with one but I plan to! :o)
-roman



Simon Nield wrote:
>
> >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
>
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