water level indicator circuit using cmos ics


Posted on Feb 7, 2014

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. When the water is empty the wires in the tank are open circuited and the 180


water level indicator circuit using cmos ics
Click here to download the full size of the above Circuit.

K 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. 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.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sound Operated Switch
    Multi-color LED driver
    Schmitt trigger zero crossing detector
    colpitts crystal oscillator circuit
    led vu meter circuit using lm3915 ic
    Simple UHF Video Transmitter
    TDA1083 Am radio receiver circuit diagram electronic project
    3 channel audio mixer
    Circuit RF Amplifier
    Sine wave schematic



    Top