Instructables
Hy, This is one of my favourite projects because it is easy to make and needs a very few things. Mind it that I have not Invented it. Just made it by the help of other websites. As the current from the electrodes flow to each other through water and earth is provided the transistor gets charged and turns the led or the buzzer or whatever you have attached. I hope you like it.                                                                                                                                                  
 
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Step 1: Supplies

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Transistor BC 547   (2)
Led                          (2)
LDR                         (2)
Jumper Wires
Resistors :- 1k, 470 KR
Buzzer                    (Optional)

Step 2: Building

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Firstly attach BC 547 any side of breadboard as you see in the picture.

Step 3:

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Now attach the 1k resistor from the middle leg of the transistor to the GND side.

Step 4:

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Attach the jumper wires from the leg of the transistor to the GND side.

Step 5:

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Attach the 470KR resistor one pin down one pin right from transistor leg which will be use to reduce the current of buzzer and led.

Step 6:

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Now attach the buzzer positive at the resistors leg and negative at the transistors leg line.

Step 7:

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Now attach to wires in the same line you placed the buzzer if you want to put led. If no then follow the next steps. In this step you just have to make two terminal as I did to use both led and buzzer.

Step 8:

Now the final step take a jar and stick the electrotodes at the upper level or at any level you want. And attach the other two ends at the bread boards at the middle of the transistors leg line. Now you are done power it and tattatattta. You have successfully made a water level indicator, you can place it in your tank at your homes when the water will touch the electrodotes the buzzer will beep and led will be lit if you have done the setting of led. You can modify it and make two circuits on this breadboard, both will be same but place the other twol wires at the middle level which will show that the water reached the middle level. 
Ivanakol12 months ago
great job trying do one too
zymie1 year ago
Nice job!

A schematic of the circuit would be informative for anyone that wants to duplicate your project, or expand on it.
mzain3 (author) 1 year ago
Thanks. I would definitely put up a video after my exams.
Strontium1 year ago
very good circuit dude.i'm 13 now and i also started when i was about 11 years old.once you understand how components work,you'll start to get really interested.as for learning more about electronics i recommend-make:electronics,electronics for dummies,electronics demystified etc.
oh and are you from india?
wilgubeast1 year ago
Nice work! I'd love to see you incorporate this into a vase or something so you know when your water level is getting too low. Maybe bamboo or something that can sit immersed in water for long periods of time.
mzain3 (author) 1 year ago
Please Comment Visitors.