Water Level Indicator With Alarm


Posted on Feb 5, 2014

This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full. The circuit uses the widely available CD4066, bilateral switch CMOS IC to indicate the water level through LEDs. When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low


 Water Level Indicator With Alarm
Click here to download the full size of the above Circuit.

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. Remember to turn the switch ON while pumping water otherwise the buzzer will not sound!




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    In-line wattmeter
    Atv Video Sampler Circuit Circuit
    Guitar To MIDI Using The LogoChip V2
    Bluetoothß„? Front-end Ic T7024 Design Guide
    why doesnt this circuit oscillate
    Telephone privacy circuit
    28 LED Clock Timer Circuit
    Selfrunning Free Energy 5 KW Kapanadze 8
    infrared ir receiver



    Top