Water level indicator
In water tank we connect all six wires in steps. Out of these six, five wires for invertors circuit and one wire for positive reference voltage. Positive reference voltage is connected to the bottom of the glass. There is no water in empty tank. All wires are disconnected with reference voltage probe. When water fill up in the tank then wire are connected with positive voltage probe in water. Positive voltage wires are connected input of IC and IC converts these into negative. These negative output are connected to led's the led' ON step by step. As the last led will blink, buzzer will also activated.
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