Instructables
Today I am going to talk about a very useful project that I had taken up. It is called the Water Level Indicator. Nowadays everybody has overhead tank at their homes. But everyone who has a water tank above knows the kind of problems that they face. Firstly there is no system to track the water in the tank. Then there come a secondary problem that is when their water pump is started they have no idea when it gets filled up and sometimes there are situation where the pump keeps on pumping water to the tank and the water starts spilling out from the tank. There is wastage of energy as well as wastage of water.


 
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Step 1: Things you need...

4 - bc548

6 - 220 ohm resistors

3 - colour led

1 - buzzer

1 - 9v battery + battery clip

Step 2: Circuit diagram

Picture of Circuit diagram
gfzghash.JPG
The circuit consisting of 5 sensing probes which is dipped in water to sense the level of water. The probe A is connected as common to other four , which should be at the bottom most part of the water tank, also it act as a reference level. The probes B, C, D and E are set as minimum, minimum+ , middle and maximum level respectively.

Assemble the circuit...... 

Step 3: FINISH.. :)

When water in the tank touches the probe A and B both, a small current flows from A to B through water and to the base of transistor T1 via a 220KΩ resistor. As a result the transistor conducts causing the LED1 to glow. Similarly, when water touches sensor C, LED2 glow and indicates that WATER is at minimum+ and when water touches sensor D , LED 3  glow and indicates that WATER is at. MIDDLE . Finally, when the water touches sensor E ,  BUZZER turns on and indicates the tank is completely filled.

Biscuitus1 month ago

This is exactly the circuit I was looking for but battery wouldn't work for me as it's in a machine shop and we have too much going on to keep track of it and I don't feel like making a low voltage circuit, but I do have a 5v 1A wall wart, and all my math says I can do it, albeit my LED's may be dim...thoughts?

Also, very nice instructable, but maybe you could put the specs of some of the things you used (i.e. wattage of resistors, speaker specs etc.)? I know that for this circuit you could easily use a 1/8w resistor but the speaker I just kind of hummed a few bars and faked it and used a 1.5v speaker and put an LED in front of it to step the voltage down a touch.

Er Varun Goyal (author)  Biscuitus1 month ago

use a battery adapter in the place of a battery , soo that it reduce the cost and save your time also .

I'm going to use a voltage divider and knock it down some. I lose a little in heat but it's for a Wire EDM water tank that I'm constantly over filling (and that wreaks havoc with the accuracy) so it'll get some cooling. Thanks for the response!
Er Varun Goyal (author)  Biscuitus1 month ago

thankyou sir , for your positive feedback .

maybe you can by modify the above circuit accourding to your requirement . :)

zsoltinyo6 months ago

Does this work with motor oil?

If it works with motor oil you have much bigger problems than oil level :)

Er Varun Goyal (author)  zsoltinyo6 months ago

no sir , Engine oil does not conduct electricity
because there are no charge carriers in it.

highwind0017 months ago
This can prove useful in my boat. Thank you much for posting
Er Varun Goyal (author)  highwind0017 months ago
anytime buddy.. :) and thankyou
swamy20112 days ago

and also by using with relay and motor, the motor is automatically start when the tank is empty and stop when the tank is fully....if you know this is one please explain...........

swamy20112 days ago

also by using motor and relays the motor is automatically start when the water is empty and stop when the water is full....if you know this is one please explain..because this project im using as a mini project

swamy20126 days ago

is this ckt working correct or not

Er Varun Goyal (author)  swamy20125 days ago

yes, the circuit above is working fine and is tested by me... please watch videos in the manual above or

click here to watch on youtube..

p mishra1 month ago
hey did u saw a vid of learn by watch and made it
Er Varun Goyal (author)  p mishra1 month ago

Yes, but maybe the circuit there is not correct.
In that circuit -ve pin of L.E.D. is connected to the +Ve pin of the battery and the circuit was not working correctly. So I Modify the circuit and made it better.
now it works fine...

compare both the circuits and find the difference , try to make both the circuit to find the better result of difference :)

In what configuration is the BJT used?? Can u please tell me a bit about how did u design this circuit?


Thanks a ton.

Er Varun Goyal (author)  shantanutelharkar6 months ago

sir , the circuit is based on 4 transistor switches. Each transistor is switched on to drive the corresponding LED/buzzer , when its base is supplied with current through the water through the electrode probes. :)

Well, I got that. Your circuit works fantastic and is very simple. I am asking whether the BJTs are working in Active region or Reverse Active region? Because generally the collector is connected to positive terminal of battery.

samalert7 months ago
I was really expecting a video of project in action.
Er Varun Goyal (author)  samalert7 months ago

dude.. here is the video of project in action.

http://www.youtube.com/watch?v=UDh70yq5wt8&feature...

thankyou for your feedback :)

Dude i really wanted to hear the sound the buzzer produce. Cause i was thinking of implementing it in my house for some reasons. Thanks a ton for posting the video.

Er Varun Goyal (author)  samalert7 months ago
:-P

anytime bro. .. and thanx to you too .
Er Varun Goyal (author)  samalert7 months ago
sorry frnd...
next time jb bhi bnaunga ... video post krunga .

btw project ki pic se b pta lga rha h k iski working kya h....
Er Varun Goyal (author) 7 months ago

updated.. with video of project in action. :)