Quote Originally Posted by ardhuru View Post
Basically 3 tanks 2K to 5K litre capacity, non-metallic, heights 6 to 8 feet. Having got a quantitative reading from all 3 tanks, there's logic that also controls a pump to keep the levels at a required level..

I have a similar project I need to build, but haven't had the time yet.
Same type of deal... need to read the water level in two 11,000+ liter (3000 gallon) tanks and one 1200 gallon (4600 liter) tank.

I was thinking of using a 16F726 at each tank and using the built in capacitive sensing module. I would use small strips or squares of copper tape stuck to the outside of the tank at 10 different levels. That would sense the water level directly, with each square of foil being one capacitor plate, the water being the other, and the plastic tank wall the dielectric.

Water level data from each PIC would be transmitted down the hill (about 500 feet) through Cat5 cable to a "master controller" PIC located here at the house.

I'll be curious to see what solution you come up with and how well it works.


steve

steve