I saw an ultrasonic range finder project somewhere, I don't know how
accurate it is though.

-----Original Message-----
From: Andy Shaw [mailto:andys@SCO.COM]
Sent: 16 October 2000 11:45
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Help water level


Hi Folks,
I'm trying to put together some sort of sensor to measure the amount of
water in a model sub ballast tank. The requirements are:
1. Must be small (not a lot of space).
2. Easy to seal against water.
3. Continuous range from say 1 cm to say 30 cm deep, with 1mm accuracy.
4. Possibly best not to use anything that depends upon pressure (since this
may vary depending upon sub depth).
5. Easy to hook up to a PIC (either digital or analogue OK  - I have both).
6. Cheap!
Not asking much!

I seem to remember seeing a rain gauge project that used two (insulated)
wires separated by a fixed gap as part pf some sort of oscillator. But guess
what I've lost the mag. Anyone got the details of know if this would work
for me?

Thanks

Andy

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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.