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    This simple water level indicator will activate an active buzzer (e.g. BeStar BPT-23CX ) in order to make a noise when a certain level of water is being reached. Because the water sensor and the command circuit are located on the same printed circuit board, indicator, together with its 9 V battery and the buzzer can be mounted in a compact case. Obviously the sensor, that is made by corossion, on the board, must not be mounted directly on iron or steel bathtubs but with a magnet atached on the case.

    Schematic of the Water Level Indicator Circuit

    water level indicator circuit

    Check out the new water level sensor circuit.

    In order to avoid the scratching of the bathtub, the magnet can be covered with plastic or rubber. If the bathtub is made of polypropylene, the water indicator must be attached to it with two clamps or double adhesive tape.

    The breadboard

    water indicator breadboard

    When the water reaches the sensor T1 base is connected to the positive terminal. In consequence, T1 and T2 are opening and the active buzzer makes a buzz. The current consumption is now around 25 mA.

    In order that the water level sensor circuit will not be put into operation by steam it may be necessary the reduction of the sensibility by increasing the value of R2. Is recommended to tin the PCB in order to avoid corossion.

    ask a question

    15 Responses to "Water Level Indicator Circuit"

    1. please sir, i am still a baby in electronic, please sir. i want to know obtain a traning in Electronics

    2. better open the books of intermediate…n learn basic electronics…then u’ll understand higher electronics

    3. sir, i want a simple circuit of water level detector either with or without the alarm which can be used to avoid overflowing of water from the overhead water tank and also should be easy to implement.
      please reply…

      • Mr.Mayank mishra ,u can go through the following website http://www.circuitstoday.com.You will get a good water level controller with a good and simple circuit diagram….I have implemented it and its been working good from past 6 months without any problem…if u still have doubts u can contact me through e mail …anupnmadhva@gmail.com

      • hey! on saturday deres my prcticl of ece… i hv equipments for making watr level indicator ckt…bt dn knw hw to make.. n i hve to knw so mch abu dis… wil u gve me favour?

      • Haroon Rasheed says: on May 25, 2015 at 10:00 pm

        thank you! your suggested website really came in handy.

    4. Ya i can help u….ask me wat ever u want…its better u mail me …

    5. i need the applications and working of water level indicator….

    6. I am very thankful to you for sharing this water level indicator circuit along with good videos. This is one of the best projects for engineering level.
      I have seen this kind of project in other site also. If anybody interested, visit http://www.electronicshub.org/water-level-indicator/
      It is also very interesting to read.

    7. Hi, are u using battery as a power source?

    8. This works fine for 12 V, too.
      Built as a water pump switch, for automatic water level control.
      The pump requires 2.2 A, so the part BC548C needs to be exchanged -> BD441 is working fine.

    9. sir, i want to know that,

      water tank is on top of my building. Does that power suppy enough to drive the buzzer and transistor?

    10. hello guys,can i have a direct interfacing of the level sensor and my 18f4550 pic controller circuit

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