Water Level Indicator with Alarm

 by raikut
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Introduction
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.

Later History
This project that i had taken up is the result of  long hours of research of work at the Internet as well as long hours of thinking. I had made various versions of the projects earlier but at last i came up with this final product. I bet this has been tested and i can now firmly say that the model would work flawlessly without any complains for years. I am saying this as i have installed this models to various houses in my neighborhood and all are working fine without any maintenance. And indeed this model is admired by all who uses it.

The Situation 
The house where I live in has an overhead tank which is about 30 feet from the ground level. I was getting bored going up the rooftop to check whether the tank has filled or the water level was below to start the pump. I had to do this again and again. Then I sought for a solution. I always used to think of the possibilities of how can this problem be tackled in an electronic way. After years of research and by trial and error,  I found one and wanted to put whatever I have done out here so that it may be helpful to someone who has a overhead water tank at their homes.


 
 
 
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Step 1: The Working Principle

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Basically the unit is made up of various sensors acting as a switch. Let me explain in a simple way. What happens is when you turn on you water pump, the water starts to get pumped from your underground reservoir  or from your underground water supply from the pipes to your water tank. In the tank there is a set of sensors ( to be precise there are 7 sensors), in the water tank. Just think them as a switch, as the work of the sensor will be to connect a circuit. I will explain in details in my instructables. So the water starts to get filled in the tank and when the water level in the tank starts to rise up, what happens is that the sensors that is installed in the tank starts to get activated one by one indicating the water level in the tank. And finally when it reaches to its top most sensor, there will be a visual display as well as a sound from the unit indicating that the water has filled in the tank and one can be alerted that the tank has been filled up and the water pump has to be switched off saving the electricity bill as well as over flow of water from the tank.

There are Four parts in this project:-

(i) The Sensor Part

It is generally a fixed support inside the tank having some nuts and bolt with wires coming out.
(ii) The Circuit Part
It comprises the brain of the module, where in all the various inputs from the sensors are fed. It is the unit from where you will get all the information of how much of water is in the tank.
(iii) The Power Supply 
It is the part where in you will be converting the A/C voltage to a regulated voltage of 5V to the Circuit.
(IV) The Buzzer Part
It is responsible for bringing up the sound when the water level fills up in the tank. It will also be having a speaker or a buzzer to alert.
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Tachyon says: Jun 17, 2013. 8:12 AM
It's interesting what people take for granted as "normal" in their daily lives. For example, for you it's normal to have a rooftop water tank fed by a well. Up until last year I lived somewhere where it was normal to have a water tank in or under your house that was refilled by truck every few days.
I'm sure that a lot of people reading this from North America or Europe will find it odd to have a water tank in your home. Of course having a tank has some distinct advantages too. Especially a gravity fed tank like yours.
It's cool to see how other people live and do things differently. Thanks for sharing.

Now, regarding your project. Nicely done with good pictures and instructions.
Have you had any issues with metal parts corrosion?
raikut (author) in reply to TachyonJun 17, 2013. 11:47 PM
In fact the metal parts starts to corrode in due time but is still working fine as it just needs a small amount of current to sense, and thank you for your compliment
gurpreet_singh says: Jun 16, 2013. 10:51 PM
i have one question idont know whether it is stupid or not...just want to know will there be current in the water coming out of the tap from tank as 24 hrs supply is given to the sensor in the tank because of switch made with wire for led showing and buzzer..
raikut (author) in reply to gurpreet_singhJun 17, 2013. 2:12 AM
That is purely a negative. There will be no current flowing in the water tap as due to the resistant of the water all will be resisted by the water in the tank only and as the voltage is very low at around 4-5V, so don't worry about the current
haneefmubarak says: Jun 17, 2013. 12:17 AM
@raikut Why not connect the indicator circuit (along with a flip-flop or two) to a high-voltage solid-state relay to run your pump? That way, you could have the indicator circuit automatically switch on the water when the tank is low and switch off the water when the tank is high.
frank26080115 says: Jun 11, 2013. 3:51 PM
metal in water with current running through it means the electrodes will corrode, putting ions in the water
Psychoboy says: May 28, 2013. 7:17 AM
Im really interested in making this project! can u pls provide me with more details of our project! specifying all the components !
raikut (author) in reply to PsychoboyMay 28, 2013. 10:59 PM
There is a picture along with the components details i have given in the instructable, you can check that and if you have any issues you can check with the circuit diagram, which is also provided within the instructable
tushar123 says: May 26, 2013. 6:34 AM
hey raikut,,i was thinking of interfacing your project on android what do you say?
raikut (author) in reply to tushar123May 26, 2013. 7:23 AM
I will be more than happy if you could do that, can you tell me how will it help by interfacing on Android?
powdaskier says: May 20, 2013. 6:52 AM
Raikut, and Shouvit, How would you be able to switch the circuit up so that the light goes on and the alarm sounds when the water is not present?
sidd889 says: May 3, 2013. 10:26 AM
hi..RAIKUT...i like your project & i have already thought of making one ...So i want ask u that where u have used the 470 k ohm resistors...
raikut (author) in reply to sidd889May 4, 2013. 3:59 AM

please see the circuit diagram http://www.instructables.com/file/FFAQA5WHA4LG0OI
yajuj says: Apr 15, 2013. 10:38 PM
plz reply soon..... instead of grounding them i have connected the points(those at the collector end of the transistor) to the negative of the battery. will it create problem ......plz reply i have only one day left ......
yajuj says: Apr 15, 2013. 12:28 PM
hey raikut plz reply..... do i need to connect the transistor forward biased or reverse biased
and my power supply is 4.5 v ....is it ok...
seethasub says: Apr 8, 2013. 10:45 AM
There is mistake in showing collector and emitter of the transistors. Collector should go to positive hence LEDs cathode should be connected to collector of BC547 and emitter should go to common negative line.
raikut (author) in reply to seethasubApr 8, 2013. 11:51 PM
This issue has been discussed earlier, please go through the comment section and watch the given video

shouvik says: Mar 29, 2013. 5:13 AM
hey Raikut, i have made it but mine is working other way round, means if water touches the sensor, LED turns off. please suggest solution
aalexandru2 says: Mar 28, 2013. 1:54 PM
Hi, it is a usefull circuit and a thank you for it! I was wondering if you can help me with a additional circuit tu amplifiy the outputs(led's) so I can turn a 6v relay.
vinayminajagi says: Mar 14, 2013. 9:35 AM
Hey if i use a 5V battery directly insted of converting A/C to D/C, will it be fine?
raikut (author) in reply to vinayminajagiMar 14, 2013. 10:27 PM
That would work just fine
mzrokz says: Mar 6, 2013. 5:08 AM
Once again thanx a lot man, it wil help me nd mah best buddy d most....
mzrokz says: Mar 5, 2013. 6:26 PM
Hello raikut, thanx for this awesome project. I have a question that in one comment below somewhere you said that there is some correction in the circuit i..e. the instead of base the collector will be grounded, so i want to ask that the circuit shown above in steps is correct or incorrect. Please help as soon as possible.
raikut (author) in reply to mzrokzMar 6, 2013. 1:16 AM
yes, that has been rectified at the circuit diagram that i have prepared at the Circuit section so you can go ahead and wire it as i have shown in the schematics
Nimmi Thakur says: Mar 4, 2013. 8:43 AM
No... we are using 9-0-9 N me n mah best buddy(Mz) are together making this project to present it in technical competition of our clg :) n it.ll definately win the first prize , if it will work :) Thanks Raikut :)
Nimmi Thakur says: Mar 3, 2013. 10:41 AM
Hey Raikut.. , I tried a lot but could not get the transformer's connection . Can you explain me, how can I find that which among the three wires of the output is of ground??
raikut (author) in reply to Nimmi ThakurMar 4, 2013. 12:51 AM
The middle is the ground. But what is the voltage specification of the transformer.
Is it 5-0-5???
sragha45 says: Feb 11, 2013. 9:04 AM
hi i cannot understand where the negative terminal should be connected...
should it be connected to the 470 ohm resistor?
and also where to connect the ground of 7805 voltage controller?
and i cannot find the connector... is there any alternative??
i want to make this project as soon as i can
please help me
please this is urgent.....
please respond as soon as you can...
raikut (author) in reply to sragha45Feb 12, 2013. 10:05 PM
The Ground of 7805 should be connected to the negative terminal of the Power supply. And for the connectors you don't need to have such type of connectors. You can just make a junction box and connect it manually one by one and later tape it with an insulation tape.
sragha45 says: Feb 11, 2013. 8:57 AM
hi i cannot understand where the negative terminal should be connected...
can u explain with the full diagram?
please this is urgent.....
please respond as soon as you can...
p
sragha45 says: Feb 9, 2013. 12:38 AM
hi, i cannot get the connector...
what can i do?
Moi Maddox says: Jan 28, 2013. 3:28 AM
i have sent you an email. pls check and reply.
Moi Maddox says: Jan 21, 2013. 11:26 PM
Hey, are you good at programming? im doing a project on water level indicator using PIC. i really need your help on this, could you please contact me; hopelesslove0330@hotmail.com

thank you so much
raikut (author) in reply to Moi MaddoxJan 22, 2013. 12:06 AM
What help do you want from my side. Go ahead???
Moi Maddox in reply to raikutJan 27, 2013. 4:27 AM
hey, thanks for replying, really appreciate it. i need your help on making a program for my PIC16F84A using MPLAB IDE. can you give me your email so that i can explain further about my project?
raikut (author) in reply to Moi MaddoxJan 27, 2013. 8:49 PM
dipendraraikut@gmail.com
Moi Maddox says: Jan 27, 2013. 4:26 AM
hey, thanks for replying, really appreciate it. i need your help on making a program for my PIC16F84A using MPLAB IDE. can you give me your email so that i can explain further about my project?
strange leader says: Jan 18, 2013. 6:27 AM
i have made like this circuit but after some days an oxide begin to deposit on the sensor wire which causes to stop the flow of current through sensors.do you have any remedy or solution for this problem???
raikut (author) in reply to strange leaderJan 18, 2013. 11:09 PM
Yes, there may be some oxide formation in the sensors but it would work, I have implemented in my home too but even there is oxide formation it works as the sensors only need small amount of current to trigger the transistors.
arnab0910 says: Jan 17, 2013. 4:15 AM
here in ur circuit diagram i have found that u hav used 2 capacitors bt on the inplemented circuit i found that u hav used 1capacitor
Is this posible with out output capacitor??
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