A very simple low cost water level indicator circuit can be designed
using this schematic circuit . This water level indicator is based on a
simple CMOS IC CD4066 and indicates the amount of water present in the
overhead tank and also gives an alarm when the tank is full. As you can
see in the circuit diagram the circuit uses the widely available CD4066,
bilateral switch CMOS IC to indicate the water level through LEDs.
Water Level Indicator Using CMOS ICs Circuit Diagram:
When the water is empty the wires in the tank are open circuited and
the 180K resistors pulls the switch low hence opening the switch and
LEDs are OFF. As the water starts filling up, first the wire in the tank
connected to S1 and the + supply are shorted by water. This closes the
switch S1 and turns the LED1 ON. As the water continues to fill the
tank, the LEDs2 , 3 and 4 light up gradually.
The no. of levels of indication can be increased to 8 if 2 CD4066 ICs are used in a similar fashion.
When
the water is full, the base of the transistor BC148 is pulled high by
the water and this saturates the transistor, turning the buzzer ON. The
SPST switch has to be opened to turn the buzzer OFF.
As you can
see this electronic liquid sensor circuit require very few external
components and need to be powered from a 6 volts DC power supply .
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