an ULN2803 IC. ULN2803 is an eight darlington  array IC that contains eight darlington transistors. Working of the circuit is simple, the base of all transistors are connected from pin1 to pin8 and the positive rail is used as the bottom probe. When the water level reaches to each probe it will make electrical connectivity between the positive rail and the probe due to which associated LED will light up. The operating voltage of the circuit is 12V DC.

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This is a project of a simple water level indicator using ULN2803 IC. The circuit will indicate 8 levels of water. At the output of the circuit there are 8 LEDs, which will become activated one by one according to the level of water detected by the probes.
The heart of the circuit is
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Simple Water Level Indicator Using ULN2803