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    This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes. It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for example an aqueous solution, then because of the rectification action of D1 and D2, the C4 capacitor is charging.

    When the capacitor voltage reaches switching threshold of the N2 trigger Schmitt, the relay will trigger and connect, for example a drain pump. The pump will be disconnected as soon as the electrodes won’t touch the liquid.

    Simple water detector circuit schematic

    simple water detector circuit schematic

    Water detector components
    R1 = 470K
    R2 = 10M … 22M
    C1 … C4 = 2.2nF
    N1, N2 = 1/2 4093
    D1 … D3 = 1N4148
    T1 = pnp transistor (BC557)

    ask a question

    12 Responses to "Simple Water Detector Circuit"

    1. i have a problem to find antenna booster circuit..can u all find to me the circuit..URGENT!!!!

    2. what is Re in this circuit.

    3. tayyab:
      Re = Magnetic Relay


    4. i have some problem with this ckt. who done it , please, call me on this no.9145383092

      • P Banerjee says: on February 12, 2012 at 5:21 pm

        I made the ckt. It does not work as it is supposed to. The relay gets energised whether the sensors are conducting or not. If anybody has figured out what is wrong pse post a reply.

    5. I want working and more information about liquid level sensor.

    6. how to make the sensor plates to detect water?

    7. The circuit works fine, but the relay remains energized after the electrodes are removed from liquid. What have I done wrong?

    8. giving me the full video of that circuit

    9. Plz… Send in circuit full working in relay and load connection diagram.

    10. Is this circuit working or not ?? Is this circuit tested on simulation softwares ?

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