Sorry, I am new here and ended up in the middle of this submarine ballast
tank controller thread.  But I did just read about level sensors:

Check Don Lancaster's Tinaja.com

Download HACKAR1.PDF (note spelling)
 Page 12 (Hacker2) ULN2429 Capacitive Liquid Level Sensor
 Page 45 (Hacker10) Pressure Measurements
 Page 101 (hacker21) Capacitive Humidity Sensor

It may be neat to look at electrolysis to generate hydrogen on demand and use
it to control the submarine depth.  Or drop some NiCad cells in the tank for
emergency surfacing.  Add a spark plug for extra thrust!

Randy Lilly -(Building a MPPT controller for solar panels using 16F877)

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