Automatic water tank level controller motor driver circuit- Engineering project without Microcontroller

By
Khaleel
264 Comments

Automatic water level controller circuit is a simple engineering project. It can automatically switch ON and OFF the domestic water pump set depending on the tank water level. You can implement this motor driver circuit at your home or college using less costly components. The approximated cost of the project is about $5 only. The main advantage of this water level controller circuit is that it automatically controls the water pump without any user interaction.
The heart of this pump controller circuit is a NE 555 IC; Here we have manipulated the flip flop inside the 555 timer IC. Our project consists of two water level sensors, one fixed at the top and other at the bottom. Working of this circuit is almost similar to a bi stable mutlivibrator. Simulation of this circuit is also given below. Definitely this will help you to do your academic project.

Circuit Diagram

Components Required
Power supply (6v)
NE 555 timer IC
Resistors (100Ωx2, 10kΩ)
Relay (6V, 30A)
BC 548 transistor x2
1N4007 Diode

Working of Automatic water tank level controller
We know the property of 555 timer IC, i.e. its output goes HIGH when voltage at the second pin(trigger pin) is less than 1/3 Vcc.
Also we can reset back the IC by applying a LOW voltage at the 4th pin (Reset pin).
In this project 3 wires are dipped in water tank. Let us define two water levels- Bottom (Low) level and Top (Up) level. One of the wire or probe is from Vcc.
The probe from bottom level is connected to the trigger (2nd) pin of 555 IC. So the voltage at 2nd pin is Vcc when it is covered by water.
When water level goes down, the 2nd pin gets disconnected(untouched) from water i.e. voltage at the trigger pin becomes less than Vcc. Then the output of 555 becomes high.
The output of 555 is fed to a BC548 transistor, it energizes the relay coil and the water pump set is turned ON.
While the water level rises, the top level probe is covered by water and the transistor becomes ON. Its collector voltage goes to Vce(sat) =0.2.
The low voltage at the 4th pin resets the IC. So the output of 555 becomes 0V. Hence the motor will turn OFF automatically.
For simple demonstration of this project you can use a DC motor directly at the output of 555 instead of relay.
For practical implementation, you must use a relay. Rating of relay is chosen according to the load (Motor). 32 Ampere relay is best suited for domestic applications.
Also read: How to connect relay:Relays working with animation

Simulation of the Project

The mouse click on the bottom level and top level switches show the level of water, From the animation you can see that when the water is at the bottom level the motor starts working and when water reaches at top level motor stops functioning.
Also read:

Numeric water level indicator
Water tank overflow liquid level sensor alarm circuit
Now, here is your water level controller project. Was this project helpful to you? Don’t forget to use the comment box below to share your views and clarify any doubt regarding the project.

PCB layout

Click on the images for enlarged view

Components Pin out

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264 thoughts on “Automatic water tank level controller motor driver circuit- Engineering project without Microcontroller”
[email protected]’Kojo BaidooJune 18, 2013 at 12:42 pm
what resistor values will be suitable if 12 volts vcc and relay are used

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[email protected]’YaseenJuly 17, 2013 at 6:42 pm
Hi Kojo Baidoo
You can use same resistor value for both 6V and 12V Vcc

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[email protected]’yash nOctober 9, 2015 at 6:49 am
i have made this circuit on pcb and when i checked the circuit was not working i give 5v input and the circuit is always in all condiction
can i get ur contact no. to share my problem

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[email protected]’uday joyJuly 18, 2013 at 2:04 pm
can u explain me how to connecta relay?

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[email protected]’AdminJuly 18, 2013 at 6:59 pm
Hi Uday,

Glad to see you here. I have already published a detailed article on relay. Please check this How to connect relay:Relays working with animation

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[email protected]’lokesh jeevaJuly 24, 2013 at 2:21 pm
Hai admin,

For sensor what material we can use.whether we can use it with normal wire.

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[email protected]’AdminJuly 28, 2013 at 6:50 pm
Hi Lokesh,
Nice to see you here. You can use any conducting material as the sensor.

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[email protected]’usmanSeptember 8, 2014 at 7:48 am
Sir icant uner stand how to connect in ur digram whichis no and nc and c plz xplain me k

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[email protected]’RajuMarch 14, 2014 at 11:10 am
Normal wire is getting corrosion.

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[email protected]’Shankha Shubhra GuinMay 6, 2014 at 7:19 am
Use A Copper Plate or Galvanised Plate.

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[email protected]’srinivasMay 8, 2014 at 3:31 pm
for sensors, we can use audio pins male or female of good quality. I used them and they are working well from the past 1-1/2 year.

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[email protected]’Rohit TodkarJuly 27, 2013 at 6:02 am
hi I am getting heat from 100 Ohs Register,which attached to 3rd pin on ic-555….?

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[email protected]’AdminJuly 28, 2013 at 6:53 pm
Hi Rohit,
The possible reason is a damaged transistor. Please check if your transistor is working fine.

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[email protected]’MikeSeptember 23, 2014 at 3:10 pm
With 12V & 100ohms, I measure 9 volts across the resistor, working out to 0.8W. I used a 1/4 watt resistor so it is undersized.

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[email protected]’DarylJuly 29, 2013 at 9:51 am
I’m also having same problem. Nothing happened after switched on. The 100 Ohm resistor heated up. Changed another transistor but same problem. Not working.

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[email protected]’AdminAugust 4, 2013 at 2:46 pm
Hi Daryl,
Please see to that if your relay is working fine, you can do that by connecting to 6V Vcc(if 6V relay is used). Also check if diode is connected properly.

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[email protected]’Sourav BasuSeptember 28, 2013 at 7:52 am
Hi Admin,
I have the same problem of heat generation at 100 ohm resistor attached to pin no 3.
I have used 12v supply and relay, I have checked the circuit is working fine, only problem is heat generation at 100ohm when water level is low and the relay is charged to on position. please reply.

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[email protected]’MikeSeptember 16, 2014 at 9:56 am
Same problem. I measured 9V across the 100ohm resistor. That’s about 0.8W.

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[email protected]’Arif MogralAugust 4, 2013 at 1:19 pm
1. This circuit checked na?
2. How much amp reqd for relay? Am using 1hp pump.

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[email protected]’adminAugust 7, 2013 at 11:14 am
1) This Circuit is tested and verified in our [email protected] lab.
2) Use a relay with 10A switching capacity.

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[email protected]’Arif MogralAugust 9, 2013 at 9:56 am
Thank you!

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[email protected]’Arif MogralAugust 10, 2013 at 2:53 pm
Sir, Can I add LED Indicator to this? (Green when motor ON, and RED when motor OFF)

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[email protected]’AdminAugust 15, 2013 at 11:07 am
Hi Arif,
of course you can add LEDs to the project.

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[email protected]’satheesh kumar dmxAugust 28, 2013 at 1:37 pm
sir if i use 12v relay ,
then ican use 12v supply ?

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[email protected]’adminAugust 31, 2013 at 3:54 pm
Sure you can use 12V supply if you are using 12V relay.

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[email protected]’Remy CadornaAugust 1, 2015 at 3:25 am
Hello Admin, I got some issue on probe UP when used longer wire, relay will OFF when water reaches Probe LOW. Thanks

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[email protected]’shabir hassanSeptember 15, 2015 at 5:37 pm
sir can u help me in UPS reparing curcuit

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[email protected]’AnonymousAugust 29, 2013 at 7:42 pm
Hello,

Can you please send the pcb layout file

thanks,

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[email protected]’adminAugust 31, 2013 at 3:56 pm
PCB layout is already present above.

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[email protected]’Pranay KumarAugust 31, 2013 at 4:42 am
hi sir.
can we add more water level sensors to this ciruit to see exact water level in large tanks,even though its better for tiny water tank?

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[email protected]’adminAugust 31, 2013 at 3:59 pm
For that you better use our Numeric water level indicator circuit.

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[email protected]’SaranApril 15, 2015 at 5:54 pm
thanks

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[email protected]’Prashant sharmaJune 6, 2015 at 3:39 pm
Sir i have a problem with this circuit
it is very sensitive by earthing.
In circuit on position if i tuch input connector ( common low high )
Relay on automatically In full level.
in more water it cant work.

I need telephonic support plz auther send me his phone no.

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[email protected]’sriniwas devineSeptember 2, 2013 at 1:39 pm
Sir:
Please provide pump motor dry run safety circuit to use along with this circuit.

Sriniwas
(s-cube tech serve)

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[email protected]’adminOctober 17, 2013 at 11:16 am
Hi Sriniwas,

We will come up with that soon. Keep visiting..!

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[email protected]’srinivasMay 8, 2014 at 3:32 pm
We will be waiting eagerly.. thank u for the reply.

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[email protected]’gtraoJune 17, 2015 at 11:19 am
please provide pump dry running cutoff in thecircuit

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[email protected]’sandeepSeptember 3, 2013 at 12:55 am
Sir,

I want to use it for 5 storey building.Pl let me know
1) VCC = 6 volt and relay = 6volt is suitable ?
2) From ground floor to terrece using 2 pair telephone cable for sensers is good to drive the circuit? Its approximately 30 metres cable length.

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[email protected]’kartikSeptember 5, 2013 at 2:21 pm
how to modify this circuit for manually on and auto off(overflow)

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[email protected]’anshulgargOctober 17, 2013 at 7:25 am
hi i m anshul
connect a buzzer instead of motor and 220 and give the buzzer supply istead of 230v

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[email protected]’VJSeptember 7, 2013 at 9:05 am
I had purchased one kit from your online store, i have existing panel board in digital as well as old style analog. Can you let me know how to connect relay ? I have on and off button in both the panel.
Thanking you

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[email protected]’AdminSeptember 7, 2013 at 3:12 pm
Hi Mr.Vikram Jain,
We have sent one email to you regarding the relay connection. Please find the attachment in it.

Keep in touch with us.

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[email protected]’AnonymousSeptember 7, 2013 at 3:08 pm
can you tell me whats the working of diode connected with relax

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[email protected]’AdminSeptember 8, 2013 at 1:39 pm
Hi,
It is free wheeling diode, used to discharge stored energy inside the relay coil thus removing switching transients.

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[email protected]’anshulgargOctober 17, 2013 at 7:20 am
hi i m Anshul
this is free wheeling diode it is use for circulate the current

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[email protected]’khizar dahaSeptember 26, 2013 at 8:57 pm
hi,
dear i built this project at proteus nd as well multisim to simulat it but its not woeking properly….
moter turn off when water goes to upper level nd start as water level goes down uper level … but ther is nothing about the low level switch either it will be on or off moter does not start when water level goes down to low level…..i can send yu the simulating file of this

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[email protected]’khizar dahaSeptember 26, 2013 at 9:12 pm
i run this circuit at multisim software butt it doesnot work as i describe above…..

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[email protected]’adminOctober 17, 2013 at 11:19 am
Hi khizar daha,

Test it again by applying the required conditions properly, like short circuit instead of water..

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[email protected]’santhosh kumarSeptember 30, 2013 at 5:36 pm
SANTHOSH 7402480722
hi i used 9v battery for circuit suplly motor off automatically bt it doesn’t on while water geting down……………………can i know wt’s the reason

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[email protected]’adminOctober 17, 2013 at 11:22 am
Hi Santhosh,

Check if the transistor is working…Make sure that it’s base freely hanging in the air.

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[email protected]’Mansoor AhmadAugust 24, 2015 at 10:52 am
Sir What is means by N (N P) in this circuit….
M TO USE FOR MOTER what is mean by N………….
Plz reply me I am wait ………..

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[email protected]’santhosh kumarSeptember 30, 2013 at 5:49 pm
i used 12v rely&9v supply can kit works properly
>>>>>>>?

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[email protected]’adminOctober 6, 2013 at 2:14 pm
There is lesser possibility of 9V supply driving 12V relay.

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[email protected]’samajOctober 15, 2013 at 10:24 am
how to protect the motor from the dry run any change in the circuit

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[email protected]’adminOctober 17, 2013 at 12:16 pm
Soon we will publish the circuit for dry run protection. Keep visiting.

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[email protected]’anshulgargOctober 17, 2013 at 7:18 am
conducting in two dipped wire(vcc and low ) is not properly.
and if i m not using water, test on any conducter(screwdriver)then wirking properly

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[email protected]’jami kumarOctober 18, 2013 at 9:20 am
how to use this circuit in AC motor?

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[email protected]’anshulgargOctober 19, 2013 at 2:07 pm
what is black column in pcb layout in right side
And two black rows(two round shapes in this rows) in right

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[email protected]’KanikaOctober 22, 2013 at 11:01 am
Is there no any danger of current in water as top and bottom water level are connected through wires?

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[email protected]’jayaraj k gOctober 23, 2013 at 4:12 am
Thanks…. It’s working without any problems…

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KhaleelJanuary 30, 2014 at 2:54 pm
Good to know it works Jayaraj. You’re a motivation for others too.

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[email protected]’athulFebruary 1, 2016 at 10:39 am
Its is not working when the water level goes down I think the reset is not working properly,the motor turn off when it reach higher level but not turning on again when water goes down,I had do it by shot circuit but not working,same problem in isis software can u help me

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[email protected]’NickDecember 1, 2013 at 1:41 pm
This almost has the the functionality I’m looking for. We have a low yielding well and have to use a water storage system. It is bad to run a well dry so the pump would have to have to turn on once level drops below the high level sensor and turn on for short durations and then off allowing the well to replenish. Cycling in this fashion till the storage tank returns to the high level mark. Then of course a dry-run circuit would be optimal to ensure no damage is done to the pump if anything goes wrong. Anyway this could be done?

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AdminDecember 2, 2013 at 6:22 pm
Hi Nick,
To implement “Dry Run” is very simple, I will publish an article regarding simple dry run circuit in near future.

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[email protected]’baidyanath ghoshDecember 26, 2013 at 5:55 am
SIR,I HAVE MADE THE CIRCUIT OF SIMPLE AUTOMETIC WATER LEVEL CONTROLLER, IT IS WORKING FINE, THANKS. I WANT TO BUY FEW PCB OR READY CIRCUIT OF IT AND ALSO WITH DRY RUN CUT OFF. HOW CAN I BUY IT FROM YOUR ORGANISATION? PL REPLY.CAN I JOIN A HIGH AND LOW VOLTAGE CUT OFF CKT WITH IT ? CAN YOU TELL ME THE CKT DIAGRAM? PL REPLY. HAPPY CHRISTMAS.

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[email protected]’NawafDecember 5, 2013 at 9:59 am
hi Mr.jaseem
i try to get signal from Pin 7&6, but i got this which is wrong , any advice?
http://store1.up-00.com/2013-12/1386235673871.png

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Jaseem vpDecember 5, 2013 at 10:17 am
Hi Nawaf,
I couldn’t understand your query, Can you please explain little more?

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[email protected]’NawafDecember 5, 2013 at 10:58 am
i try to make 555 in monostable or “one shot” can you help me by the circuit?

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KhaleelDecember 24, 2013 at 3:31 pm
Please refer this link Monostable 555 Multivibrator Working Principle and Circuit diagram with Animation. There you can find the detailed information. Hope it helps…

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[email protected]’ChristianDecember 13, 2013 at 5:41 am
Hi Jaseem
i try your circuit and working good, but i have one little problem
i need then relay have about 30 sec delay
thanks

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Jaseem vpDecember 14, 2013 at 11:17 am
Hi,
Thanks. Sorry I couldn’t get your query. Kindly explain more. I’m really happy to assist you.

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[email protected]’MikeSeptember 16, 2014 at 9:53 am
You need a 30 second delay on start?

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[email protected]’desmondDecember 17, 2013 at 11:39 am
thanks for the topic…can you please send me your email adress??

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Jaseem vpDecember 22, 2013 at 6:20 am
You are most welcome Mr.Desmond
Our email ID is [email protected]

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[email protected]’ChristianDecember 21, 2013 at 7:01 am
So I only have 2 probes
the first is powered with 12Vdc
the second and ‘connected to the base of the transistor in series with a potentiometer
I need that the first pulse on the base of the transistor, the relay energizes and remains energized for 1 minute (adjustable time), regardless if the base signal comes up or stops.
after the selected time, the timer turns off by itself, and is ready to receive the new signal of the base.
I need this’ cause when the charge pump water, the water level is not ‘stable and the relay’ directly connected to the collector of the transistor off and attacks constantly for about 1 minute, until the level of ‘water will not be stabilized. in this way the life of the pump to be very small.
I hope I explained clearly
thanks

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[email protected]’Dj SinghDecember 24, 2013 at 1:23 pm
why a diode is connected parallel with relay

why we are using diode
what is the need of diode

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Jaseem vpDecember 24, 2013 at 3:09 pm
Hi Sing,
Thank you for asking doubts to CircuitsGallery. This diode is called ‘Free wheeling diode’ or ‘Flyback diode’ which is used to eliminate sudden voltage spikes seen across inductive loads at the time of switching ON or OFF the power supply.

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[email protected]’srinivasJanuary 14, 2014 at 7:37 pm
1. For submersible pumps, there will be 2 buttons, in which one is to start the motor and the other is to stop. The starting switch connects starting capacitor for approx a second to get the initial torque to the motor [ = = ]. When the red switch got pushed, it disconnects the supply to the contactor and the motor stops. now, please try to provide the circuit, in which the relay should trip in a second to start the motor when water is at low level and the stop switch can be connected to relay in series to stop supply to the contactor. it may need 2 relays undoubtedly.
2. the present circuit for monoblock motors is working fine, but when any other switch like a calling bell switch is pressed, the motor is getting started irrespective of water level in the tank. what to do? 🙂

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[email protected]’rabiul islamJanuary 15, 2014 at 9:13 am
bro the circiut work 2 time accurately. But in 3rd time it dont on the pump. What is the solution?

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[email protected]’sachinthaJanuary 17, 2014 at 11:06 am
good work

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KhaleelJanuary 30, 2014 at 2:52 pm
Thanks for the comment.

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[email protected]’kamranNovember 18, 2014 at 7:01 am
its realy work.thanks

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[email protected]’g.m.thamizhJanuary 26, 2014 at 2:04 am
hello sir
what the component , you dip in the tank…..wire or probe?

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[email protected]’SandeepJanuary 30, 2014 at 1:41 pm
Hi admin.. I want to add a circuit that cuts off the supply to the motor automatically when water does not get sucked up to the tank by the pump, due to some fault like air lock. Please suggest me an idea as to what I should do for this.

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KhaleelJanuary 30, 2014 at 2:51 pm
Hey Sandeep,
You need to add an extra dry run circuit for that, it can be achieved by a simple logic. We’ll publish it soon. So stay tuned and by the way follow us on facebook and google plus.

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[email protected]’joelFebruary 9, 2014 at 3:21 pm
hi sir i really like the circuit but kindly explain on how to connect the relay from the out put of the 555 down to the connection to the motor?,,please sir i need your explanation.

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[email protected]’MTKFebruary 6, 2014 at 2:55 pm
Im having a bit of a problem with this circuit so please help me out!!!
I bought and connected all the components as mentioned above and soldered them on a breadboard.
I used a 6-0-6 transformer and rectifier. the high level probe is working correctly as when I touch Vcc and high sensor it shuts the motor but when i touch Vcc and low it still runs but it should stop. And also motor is running when Vcc is not in contact with any of them which is fine. there is no possibility of faulty components as i made two different circuits and in both problem is the same. plz get back at me, its urgent.

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[email protected]’jay wardhaniFebruary 7, 2014 at 8:24 pm
Hi dear sir.
This cuircuit is only for over head tand but i want to make the water level using under ground tank nd upper tank both. So can u help me on that ?? Or send me the cuircuit on my mail.

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Jaseem vpMarch 10, 2014 at 12:33 pm
Hi Jay wardhani,
Please explain your requirement in details. I will get back to you as soon as time allows.

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[email protected]’George BiteboboMarch 18, 2014 at 2:30 pm
Please I need a detailed diagram ad description on this topic so I understand it cos it is part of my project work. Thank you for your effort so far.

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[email protected]’shekhar mirajkarApril 12, 2014 at 8:37 pm
nice project !! who can we add probs of ground water tank to show level and also cut off if no more water in ground tank ??

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[email protected]’MuzammilMay 3, 2014 at 10:43 am
Very Nice Project .

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[email protected]’anmolMay 4, 2014 at 10:31 am
Hi admin i have made diz projects its working well wid my homemade mini water pump bt i want to add relay to domestic water pump so hw much amp do i need n i want to add some led n manual switch so plz help me out… N thank u for diz wonderful projects m very happy ..

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[email protected]’Areeb AhmedMay 10, 2014 at 10:06 am
Hello sir !
Sir i have a question??
Will it work with home 3-phase motor for the purpose of Water leve indication in my home tank ?? If changes, then do let me know sir, Thank you in advance!

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[email protected]’kareemMay 15, 2014 at 9:36 am
Hai
This project is very good.
When I dip the wire (Up) It gets bubble (melting) what is the problem ? I connected the resistor (BR-BK-GR) in place of 100 ohm working good, plz solve it

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[email protected]’parth patelMay 19, 2014 at 8:39 am
wat about electrolysis of 3 sensor indide water
it drsolves in water in few days

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[email protected]’GangarajuMay 20, 2014 at 12:10 am
from wher Ic get power

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[email protected]’rahulMay 25, 2014 at 9:14 am
Hi
If i replace 120 ohm to 100 ohm it is work or not

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[email protected]’$ushilJune 3, 2014 at 4:42 am
i need ckt which can stop my submercible automatically in 5,10,15,20 min automatically by setting variabke pot adjustmebt
plz mail me

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[email protected]’Yash khandelwalJune 12, 2014 at 6:08 pm
hi , this is yash from agra ,i m a student of class 12 and i want to know the working of every part as i have nit understood. So plz help me out.

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[email protected]’AnandJune 14, 2014 at 3:21 am
Sir,if i use 6v relay
then can i use 9v dc supply?
distance between upper & lower tank is 35 m in my home then this circuit can work?
Reaply me plz

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YaseenJuly 3, 2014 at 11:47 am
Relay may get heated and damaged.

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[email protected]’GangarajuJune 30, 2014 at 6:48 am
i have built this circuit but relay making trrr sound but while i keep my hand on vcc it works well what may be the cause ?

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YaseenJune 30, 2014 at 9:59 am
Hi Gangaraju
Try connecting 100uf capacitor in parallel with the relay

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[email protected]’GangarajuJuly 1, 2014 at 10:03 am
sir ! as you suggested i placed a 100*25 capacitor its working but the problem is, it is switching of when vcc touched at trigger(low) pin only so that its getting of at low level prob only and start immidietly water leaves the low level probe so that there is no chance of rising of water to top level what can i do now pls help me I became completly crazy about this circuit i trying this since 3 day whole day

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[email protected]’Remy CadornaAugust 1, 2015 at 3:41 am
We have the same problem,but the circuit will work fine if you used short wire on UP level.

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[email protected]’srinivasJune 30, 2014 at 4:00 pm
if u connect it to the controlled 6v dc or 12v dc power supply with bridge rectifier, it won’t give that sound. try it and let me know.

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[email protected]’GangarajuJune 30, 2014 at 11:30 am
@ thanks yaseen but its working well wile keeping a hand on vcc or trigger

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[email protected]’srinivasJune 30, 2014 at 4:03 pm
Try with controlled power supply of 6v dc or 12v dc with a bridge rectifier and then check. it works well.

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[email protected]’GangarajuJuly 1, 2014 at 4:32 am
Hi srinivas i using a mobile charges its giving volatage around 7 and i have checked that by directly connect with relay its working fine but through the circuit its not operating

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[email protected]’GangarajuJuly 1, 2014 at 11:28 am
sir relay problem solved by placing a capacitor but its getting of when vcc touch with low level prob only so it get on just immidietly water leaves the low level wire it is also of when touch with up level wire and its not waiting for empty

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[email protected]’GangarajuJuly 1, 2014 at 8:19 am
its not working at all pls some 1 help me

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[email protected]’GangarajuJuly 2, 2014 at 3:00 pm
pls some one help me

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[email protected]’AkshayJuly 2, 2014 at 2:45 pm
How much current is required from power supply?? circuit is working fine when probes are connected to Vcc but in water its unable to work. There is no current flowing through water when i checked with DMM. only voltage reading is the same as supplied. I am using 12V DC, 2A supply.

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YaseenJuly 3, 2014 at 11:11 am
Hey Akshay,
Please double check your circuit. It has been tested and verified in our lab.

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[email protected]’Remy CadornaAugust 1, 2015 at 3:43 am
Sir, Why the UP level probe is very sensitive and it didn’t work if I used long wire.

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[email protected]’GangarajuJuly 5, 2014 at 11:18 am
I have replaced the ic its woking while manipulating with wire fine but in the water its not conducting what migt be the problem i checked with copper and aluminium

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[email protected]’asisJuly 9, 2014 at 4:24 am
The circuit is working fine but i’m getting some problems. I’ve used bc547 instead of bc548 and 1n4148 diode instead of 1n4007. The relay does not switch on when the water level goes below the low probe and after experimenting for a couple of times i figured it out that if you touch low probe(while up probe is outside the water) and keeping Vcc probe inside the water the relay energizes. Can anyone sort it out? I’d be glad for any suggestions. Thank you.

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[email protected]’Remy CadornaAugust 1, 2015 at 3:46 am
You must used the correct diode

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[email protected]’Ankadi Sikari ReddyJuly 10, 2014 at 1:23 am
This circuit is working properly with out connect in water tank but when i’m gonna connect in tanks it’s not working .
The distance of circuit and tank is 8m . I’m using 1.5sqmm and then 30swg copper insuleted wire for Sensor . So what ‘ll I do ?

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[email protected]’GangarajuJuly 10, 2014 at 2:41 pm
its not conducting via water what is the cause

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[email protected]’GbengaJuly 16, 2014 at 3:05 pm
Thanks for the circuit! it works fine! though pin3 didn’t go HIGH when water level went below middle probe. but that ha been corrected by connecting 10k resistor from pin2 to ground. Thanks once again for the good work. God bless you!

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[email protected]’asisJuly 17, 2014 at 10:41 am
I finally figured out the problem. Putting a 2K2 or above valued resistor from pin 2 to ground will work out and i think most of the people commenting that the circuit is not working must have been facing the same problem since the voltage at pin 2 is not dropping as it used should have been which is solved by putting a resistor. Cheers

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[email protected]’gangaJuly 17, 2014 at 7:14 pm
Dear Sir,
Thank you for your circuit sir it is great. But i have some problems,so please help me.My problems are-
1.In my house there are underground tank from which water is pumped to overhead tank,but sometimes underground tank becomes empty and if i use this circuit that can lead to a problem. So how to modify the circuit sir?
2.Sir how to protect the motor from dry run?
If you have any confusion i am ready to help you. But please help me. I also forgot to mention this is the most simplest circuit for this purpose, it is great. I like the simplicity of the circuit.
Thanks in advance.

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[email protected]’rajJuly 18, 2014 at 9:07 am
the vcc and 2pin not conducting through water what to for this

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[email protected]’amraiz khanJuly 27, 2014 at 11:05 am
khalil bhai please give me here a circuit for home generator remote control on/off.

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[email protected]’sushmaAugust 20, 2014 at 5:48 am
We can buy this project in market also? can u tell me the cost of the project?

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[email protected]’nyashaAugust 22, 2014 at 6:31 am
thank u, the project was successful, now I want to interface on my computer, how can I do that ?

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[email protected]’Aniket RajAugust 31, 2014 at 3:01 am
HELLO ADMIN I HAVE AN URGENT NEED OF YOURS .
I AM MAKING SCIENCE MODEL ON WATER CONSERVATION WE HAVE NOT MUCH BUDGET . WE ARE DOING THAT WE ARE MAKING AUTOMATIC TANK FILLED ALARM OFF . ITS WORK IS THAT WHEN TANK IS FILLED TO THE UPPER LEVEL THEN THE ALARM BEEPS AND MOTOR TURN OFF AUTOMATICALLY . BUT WE CAN’T UNDERSTAND THAT HOW I CAN AUTOMATIC TURN OFF THE MOTOR …SO PLEASE HELP US I HAVE TO SUBMIT MY MODEL ON MONDAY ( 1-09-2014) PLEASE DO IT IMMEDIATELY I AM WAITING FOR YOUR REPLY……………
YOU CAN ALSO EMAIL ME OR CONTACT TO ME IN MY MOBILE NUMBER IS +918271245022.

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[email protected]’MikeSeptember 23, 2014 at 3:13 pm
I have found the high sensor to be extremely sensitive. I can trip the high line just with my finger even when I am not touching the rest of the circuit in any way. Sometimes, measuring the voltage on the high line with my Fluke voltmeter trips it. That has an impedence of about 10Mohms. Any suggestions on how to make the circuit less sensitive?

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[email protected]’Husain ahmedOctober 22, 2014 at 12:40 am
Hiii… sir, please tell me. Can we use a simple wire as a sensor..

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[email protected]’TharinduNovember 14, 2014 at 5:50 pm
Nice post and its interesting,can u please tell me if this circuit is practical for 2m height water tank,u know, water is’nt a good conducter…..

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[email protected]’Prabhakar RNovember 19, 2014 at 5:14 pm
I am a Senior citizen staying in Mysore.
I have an open 1000 litre water tank (1.T) in my compound with bottom at (-) 3ft.
Water flows into this tank at the top at odd hours in the night and hence automation is required.
Just before the pipe enters the tank, there is a T junction with another pipe, to a 500 litre tank (0.5T), 50 ft. away, whose bottom is (-) 2 ft. There is an overhead tank (OHT) on the terrace at +25 ft.
There is a tap at the end of the pipe entering 1.0T.
Now when water starts flowing into the 1.T tank, it has to be closed after it fills up and then only water enters the 0.5T as there is not much pressure to flow on both ends. Once this 0.5T fills up water has to be pumped up to the OHT. However filling to the OHT can be done leisurely in the day time.

Ideally what I want is:
In my bed room which is 50 ft. away at +15 ft. an indicator that shows water has filled up the 1.T tank.
Another indicator that shows water has filled up the 0.5T tank.
Another indicator that shows water has filled up the OHT.
Manual and Automatic starting/stoppage of all three water flows from my bedroom.

Please let me know if it is possible for you to get it executed it by some agency and if so what may be an approx. cost. If the cost is very high, then part automation has to be done.
Regards,
Prabhakar

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[email protected]’srinivasNovember 21, 2014 at 6:49 am
Dear Sir,

I think, by using solenoid valves with the help of sensor circuits, all the 3 tanks can be operated automatically. What is the type of motor you are using to lift the water to the 3rd tank?

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[email protected]’AhsanNovem…