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this 3 LED water level indicator module is consist of one active component IC ULN2003, and several passive component.
in real application, metal contacts used in the container must be corrosion resistant metal, IE: aluminium.
this circuit can be used to indicate 3 levels of water in container, tanks, or aquarium.
when metal contact is reached, each LED starts glowing.
when container is full of water, the buzzers start ringing along with this all LEDs are ON.
turn OFF switch after use, to silence the buzzer and end the module.
you can activate again the module with switching ON, when the water level is becoming low.

song: Elektronomia - Summersong 2018 [NCS Release]