Low–cost capacitive sensor for wells level measurement

The proposed system wants to efficiently substitute the existing level sensors mounted in the dam wells based by its low cost and better precision. The system is been designed around a special designed capacitive sensor composed of eight independent copper pour areas distributed in mirror on from each other. The unknown variables of the resulted mathematical equations are the capacitances and the height of the liquid column (the level of the liquid). The capacitances are been calculated by implementing a measurement system around and AVR microcontroller and a very fast LT1011 comparator.