explanation of Water level controller cum indicator circuit

[suman kumar]

sir

i want to make the Water level controller cum indicator circuit (http://www.engineersgarage.com/electronic-circuits/water-level-controller-cum-indicator) in my project. but i m not clear about different connections as given in circuit diagram. can u please help me to make me understand the connections clearly.

        In the components section there are a no. of components mentioned (such as piezo buzzer,relay switch and ULN2003 IC ),but in the circuit diagram its connection is not specified.

        similarily some parts of ckt. diagram are also not being clear .

so please , i request everybody ,explain the circuit clearly and make the whole circuit understand to me and if possible give a better circuit diagram

for this circuit.

and i also want to know the estimated cost for this circuit….

please help me………

[Amrith]

Hi Suman,

 

The circuit is clear. I understand your concern but it is time taking to re-draw the entire circuit. I will try to explain you the same, refer below circuit.

1. ULN2003 internal circuit diagram is explained in the circuit with pin numbers so open up the datasheet of ULN2003 IC & refer the pin description & pin diagram.

2. Piezo buzzer is nothing but speaker. Check polarity while connecting.

3. Relay switch is pointed in the below diagram.

when ever you feel confused on connections, try refering corresponding data sheet you will get an idea how to connect it.

Approx cost for this project will cost you less than 150 rupees. Post your further doubts.

wysiwyg_imageupload:4974:

 

 

 

[Anonymous]

thanks amrith

can u please explain the connection inside the water tank. there is given H,P1,P2,P3,L,Vcc.what are its meanings ?

 

and  which sensors inside the tank should be used ?

and where is the connection to the motor?

what should be the value of Vcc?

 

[AJISH ALFRED]

 

I think, its nothing but,

 

H

---

highest level

L

---

lowest level

P1, P2, P3

---

ponts between those levels.

 

You can use a non-corrosive metal rod. Vcc can be upto 12V.

 

Its all there in the link posted by you.

[suman kumar]

thanks for  ur concern

but i m not geting which sensor i should use inside the water.

please provide me the name of the sensor

and what are connections at P1,P2,P3……..

thank you

 

[AJISH ALFRED]

 

The sensors could be nothing but simple conducting non-corrossive metal rodes.

 

The IC at the right hand can’t be 555, it is ULN2003. I don’t know which is the inverter IC used.

It works on the basis of setting and resetting the timer IC using the trigger and threshold pin.

Note that the Low probe is connected to trigger pin and High probe is connected to threshold pin.

Just like normal capacitor operation of timer circuits, when the water is at low level the timer IC triggers and output will be high, and water reaches High probe the timer get enough threshold to turn itself off. The SL100 is used to drive the relay based on the output from 555.

That’s how I read the circuit.

Keep the circuit as a reference and try to design your own!

If you want to know more about the 555 operation, search for 555 internals and working. You can find lot of tutorials.

One such link is given below.

IC 555 Design Note

[Amrith]

Hi Suman,

P1,P2,P3 are different levels of water to be sensed.

P1 indicates Point 1

P2 indicates Point 2

P3 indicates Point3

No need of connections just leave it floating, when water level touches at that particular point you will get an output.

[Author]

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