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Water level indicator with 7-segment display

This water level indicator electronic circuit uses a 7-segment display to indicate the water level (low, half and full) in the tank. This water level indicator electronic circuit is based on the 7408 quad two inputs and gates IC (that contains four input independent gates) and a 7404 hex inverting gates IC.
When the tank is full a buzzer is used to alert you of water overflowing from the tank.
This water level indicator electronic circuit shows the water level by displaying L, H and F for low, half and full, respectively.
The circuit uses five level sensors to sense the different water levels ( one for common GND, one for low, one for high one for half and one for overflow ) .
A high voltage at the input pin of the NOT gate, it outputs a low voltage . For a low voltage at the input pin of the NOT gate, it outputs a high voltage.
When the tank is empty, the input pins of IC 7404 are pulled high via a 1-mega-ohm resistor.
When the water is at the low sensor the common cathode 7 segments DISP3 shows ‘L’ indicating low level of water in the tank.
When the water is at the half sensor the common cathode 7 segments DISP2 shows ‘H’ indicating half level of water in the tank.
When the water is at the low sensor the common cathode 7 segments DISP1 shows ‘F’ indicating that the tank is full.

When water is at the overflow sensor ( buzzer sensor ) the pin 13 of gate N6 goes
low to make output pin 12 and the buzzer will sound .
All water sensors must be constructed from noncorrosive material . For powering this electronic circuit you must to use a regulated 5V to power the circuit.

water level indicator electronic circuit that uses a 7-segment display to indicate the water level

Comments

why the probe and the sensor did not work in the water??? can you give me a correct diagram pls?? pls reply my commnet as soon as posible thank you

Try to approach gnd to all electrodes, or try to use a better conductive electrodes

why the sensor and probe did not work in water?when approach gnd to all electrode its work... please help me..

try to use a better conductive material for sensors or large pads,also you can use a little small value for R1,R2,R3, R4

The probes does not conduct on water effectively because its not sensitive enough. try putting some salt on the water... Pretty sure it will work...

The probes does not work on water because the input signal from the water that connects the probes to the ground is weak. That was also my problem, until i found an effective solution, although the circuit will be a bit complicated or somehow quite confusing.

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