Simple circuit that can indicate the water level (Or any other conducting liquid) in a tank.. The circuit is made by five BC337 transistors, five LEDs, five 330 ohm Resistors and one Buzzer.
Here we are using transistor as a Switch. Initially there is no voltage applied to the base of the transistor and the transistor is in OFF state (no current is flowing through collector and emitter) and LED is OFF. When the water level reaches to electrode in the tank, the positive side of the battery gets connected to the base of the Transistor through the water. So when a positive voltage has been applied to the base of the transistor, it gets into ON state and current starts flowing from collector to emitter. And LED turn ON.
* I recommend using stainless steel electrodes to prevent oxidation of them by the electrolysis phenomenon.
Electric diagram at: 02:04
Music by VEXENTO
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