The circuit shown shows the water level in a reservoir, showing them by turning on LEDs. With LED4 lit, the box is completely full and with LED1 lit only the box is at its minimum level. The sensors are copper rods installed inside the box on its side, with defined distances that will determine the trigger points. The positive rod must be placed at the bottom of the box. Each level sensor is connected to the base of a transistor that serves as a trigger for the LED corresponding to the level.
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