Water Level Indicator With 7-Segment Display PCB


Posted on Feb 4, 2014

Circuits available for indicating water level is usually consist of LEDs to indicate the liquid level. But this circuit uses a 7-segment LED display instead of normal LED`s for numeric display of water level. Moreover, a buzzer is used to alert you of water overflowing from the tank. The circuit shows the water level by displaying L, H and F for lo


Water Level Indicator With 7-Segment Display PCB
Click here to download the full size of the above Circuit.

w, half and full, respectively. You can use this circuit for water tank motor control or a stand alone circuit. pins of IC 7404 (NOT gate IC) are pulled high via a 1M ohm resistor. So it outputs a low voltage. As water starts filling the tank, a low voltage is available at the input pins of the gate and it outputs a high voltage. When the water in the tank rises to touch the low level sensor, pin 5 of gate N3 gets a low voltage and results in high output at pin 6. Pin 6 of the gate is connected to pin 10 of gate N9, so pin 10 also goes high. Now as both pins 9 and 10 of gate N9 are high, its output pin 8 also goes high. As a result, positive supply is applied to DIS3 and it shows L` indicating low level of water in the tank.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    PC 12V ADAPTER
    2x 2,500W RMS stereo amplifier
    Microprocessor programmable interval timer
    Mixer Diplexer
    700w-power-amplifier-with-2sc5200.html
    LED Light Pen
    simple electronic organ
    Zipper Sensor
    fet low distortion crystal oscillator
    3 LED battery monitor circuit
    LED-Circuits 8
    Electronic Dictionary Radar Terms
    Hewlett-Packard HP-200C audio oscillator
    555 multi-purpose repair circuit diagram
    AC motor integrated Hall element off the circuit diagram



    Top