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NUMERIC WATER-LEVEL INDICATOR

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    NUMERIC WATER-LEVEL INDICATOR

    DANIYAL SYED


    Most water-level indicators for water tanks are based upon the number of LEDs that glow to indicate the corresponding level of water in the container. Here we present a digital version of the water-level indicator. It uses a 7-segment display to show the water level in numeric form from'0' to '9.'

    The circuit works off 5V regulated power supply. It is built around priority encoder IC 74HC147 (IC1), BCD-to-7-segment decoder IC CD4511 (IC2), 7-segment display LTS543 (DIS1) and a few discrete components. Due to high input impedance, IC1 senses water in the container from its nine input terminals. The inputs are connected to +5V via 560-kilo-ohm resistors. The ground terminal of the sensor must be kept at the bottom of the container (tank). IC 74HC147 has nine active-low inputs and converts the active input into active-low BCD output. The input L-9 has the highest priority.

    The outputs of IC1 (A, B, C and D) are fed to IC2 via transistors T1 through T4. This logic inverter is used to convert the active-low output of IC1 into active-high for IC2. The BCD code received by IC2 is shown on 7-segment display LTS543. Resistors R18 through R24 limit the current through the display.

    When the tank is empty, all the inputs of IC1 remain high. As a result, its output also remains high, making all the inputs of IC2 low. Display LTS543 at this stage shows ' 0, ' which means the tank is empty. Similarly, when the water level reaches L-1 position, the display shows '1, 'and when the water level reaches L-8 position, the display shows '8.' Finally, when the tank is full, all the inputs of IC1 become low and its output goes low to make all the inputs of IC2 high. Display LTS543 now shows '9,' which means the tank is full.

    Assemble the circuit on a general-purpose PCB and enclose in a box. Mount 7-segment LTS543 on the front panel of the box. For sensors L-1 though L-9 and ground, use corrosion-free conductive-metal (stainless-steel) strips.



     

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    Post Comment | 37 Comments



    ajit   1023 days ago

    I want To buy this circuit . Please help..
    Reply   1 Reply
    sumit   718 days ago

    i can give any pcb circuit
    Reply  
    swapnil   983 days ago

    What is the name of L1-L9 Sensor
    Reply  
    karthik   980 days ago

    the transistor gos to short ckt transistor voltage0
    Reply  
    jadeppa   979 days ago

    i want this circuit to buy
    Reply   1 Reply
    sumit   718 days ago

    i can give this circuit
    Reply  
    yashwini singh   974 days ago

    how much wil the components cost me for making this circuit
    Reply  
    Ranjit   970 days ago

    I would like to buy this circuit... can i
    Reply  
    gopiram   962 days ago

    the circuit is nice but too complicated
    Reply  
    nikhila rao   956 days ago

    can u tell me the how much all the components cost? i would like to do this citcuit
    Reply   1 Reply
    rajesh   746 days ago

    the cost of this project is hardly 200 to 300 rs as u see in this project few discreat componet which cost hardly 40 rs and ic 74hc147 is of rs maximum 50 to 80 rs and the decoder cd4511 apporoximatly 50 rs and the 7 segment is of rs 30 apporx.so this is not so much coasty.................so go for it dear............................
    Reply  
    Abhishek   952 days ago

    Can we use a relay at the level 9 so that at level 9 the supply to the motor goes off automatically
    Reply  
    siddhant   950 days ago

    This is awesome circuit developed and working awesome with no errors thankyou sir for this awesome circuit.
    Reply   4 Replies
    Senthilkumar C   949 days ago

    what is the name of the sensors used here..?
    Reply  
    shruthi   906 days ago

    have u made any change in dis ckt and wat sensor u have used can u plz tell.....bcoz m not gettlng d output
    Reply  
    Aditya Raghavan   937 days ago

    I just have one doubt...for the sensors L1-L9 ..do they just need to be in contact wid the water?? pls help me..m doing this as my project
    Reply  
    mahesh j   424 days ago

    have you made any changes?
    Reply  
    Anil Kumar Das   938 days ago

    Can i purchase this circuit?
    Reply   1 Reply
    Efy Admin   938 days ago

    Yes, you can buy it from Kits n Spares.
    Reply   1 Reply
    mahesh shetty   551 days ago

    i did this project but it is not working.what might be the reason?
    Reply  
    krishnakumar   937 days ago

    I want To buy this circuit . Please help..
    Reply   1 Reply
    Funsuk Wangdu   811 days ago

    I have ckt till 15 levels....Its cost only USD $250
    Reply  
    gopal   937 days ago

    what is the cost of this projec. . . . and can apply to home application. . . . if it is possible can you explain in detail. . . . ..
    Reply  
    Gogna   917 days ago

    Required PCB or PCB Design
    Reply   1 Reply
    Efy Admin   915 days ago

    We do not provide the PCB design for circuits featured in the Circuit Lab section. These are simple, hobby-level circuits.
    Reply  
    ganesh   909 days ago

    wat s name of d sensor l1-l9
    Reply  
    aaqib   896 days ago

    is this circuit really working 7-seg. display is a cthode or anode
    Reply  
    santoshnikita   892 days ago

    how could i getbuy this circuit and procedure of payment and delivery..pls its urgent..
    Reply  
    UJANG   887 days ago

    I WANT TO USE THIS CIRCUIT FOR CONTROL GASOLINE TANK IN MY CAR.... HOW CAN I DOITS SAFE FOR USE...?...THANKS
    Reply  
    lgthan   795 days ago

    how to find the L-1 to L-9 sensor??
    Reply   1 Reply
    Efy Admin   795 days ago

    L-1 through L-9 are nothing but water level sensors. They can be stainless steel rods or suitable metal rods for sensing the water levels. Stainless steel water level sensors are available in the market in either hardware or electrical shops.
    Reply   2 Replies
    Ratheesh   510 days ago

    EFY admin can you please let me know1. How do I make use the circuit if I only need 4 sensors Low Medium Mid High.2. How to put a beeper if Its Low and High only
    Reply  
    babu   434 days ago

    I want know that do EFY supply the components with PCB. If you sell Components let me Know as early as possible. I need it in school to as a project for children in the science exhibition.
    Reply  
    unni   658 days ago

    Pin configration of ic 74HC147
    Reply  
    Ambuj Gupta   233 days ago

    pls give me soon a pcb layout of numeric water level indicator
    Reply  
    Bijan   107 days ago

    Can I use 74LS147 because I could not get HC chip in local market. Please reply Im making this for my home.
    Reply  
    deepak   67 days ago

    will this work on a high distance up to 20ft bw circuit and tank....
    Reply  

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