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.
This rain detector electronic circuit project is an very simple alarm circuit , that will start an audio warning , if the liquid is present on the sense pad . This rain detector electronic circuit diagram is based on two transistors . When the sense pads conducts , Tr1 and Tr2 from an audio oscillatory circuit that will generate a pitch sound .
A very simple ultrasonic parking sonar electronic project can be designed using this schematic circuit . This ultrasonic parking sonar electronic project has an adjustable detection range from 5 cm up to 1.5 meters and a detection angle of 5 degrees .