I wanted to make a water level indicator for our home ..since our water tank is two floors above and occasional break up in public water supply..unknowingly we ll use up al the water in our tank ..to be left out with no water for a day or two and waiting for the unsure public supply to come..

the circuit is found from redcircuits

since i wanted it to be too simple i chose the circuit operation is listed in the above link..

The Circuit & My Breadboard Assembly

circuit

It will indicate three water levels
1.Low — Red led
2.Medium–Yellow Led
3.Full– Green Led

Here is my Assembly

Full level

1

Medium Level

2

Low Level

3