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Simple Water Level Indicator Posted by Tittu Thomas , 11/30/201221 Comments so far

Here’s a SIMPLE WATER LEVEL INDICATOR CIRCUIT. It is best suited for overhead water tanks to display the amount of water. The circuit consisting of 3 LED’s used to indicate minimum, medium and maximum levels. It is possible to increase the count of indicator LED’s and make it more convenient. The circuit is powered by a 6V battery and it consumes only very less current.

COMPONENTS USED

COMPONENTS RATING QUANTITYTransistors BC548C 3Led Bulbs 3Sensing Probes 18 SWG COPPER

WIRES4

Resistors 220KΩ 3220Ω 3

Battery 6V 1

CIRCUIT DIAGRAM

The circuit consisting of 4 sensing probes which is dipped in water to sense the level of water. The probe A is connected as common to other three, which should be at the bottom most part of the water tank, also it act as a reference level. The probes B, C, and D are set as minimum, middle and maximum level respectively. Assemble the circuit on a general purpose PCB and enclose it in a casing and mount it inside your home with the indicator LED’s pointing out of the box. A short length three, 18 SWG copper wires can be used as sensing probes and for common sensor Probe A, a bare copper wire can be used.

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 the tank is half-filled. Finally, when the water touches sensor D, LED3 glows and indicates the tank is completely filled. You can also combine a WATER TANK OVERFLOW ALARM CIRCUIT with it.

 

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21 comments:

1.

Kenalsoft Hackers January 14, 2013 at 8:48 PM

nice. Thanks

Reply

2.

Tittu Thomas January 15, 2013 at 12:40 AM

@ Kenalsoft

You are Welcome.....

Reply

3.

Pranav Joshi April 29, 2013 at 7:48 PM

Hi Sir,

1) Is there any special purpose behind using transistors as switch whereas we can

just use electrodes as switch?

2) Does using transistor rather then only electrodes for switching affects the power

consumption of circuit?

Reply

4.

Tittu Thomas April 29, 2013 at 7:56 PM

The Circuit doesn't works without using Transistors.

Reply

5.

situ June 8, 2013 at 9:49 AM

Can we use any other resistor other than 220k ohm and 220 ohm?

Reply

Replies

1.

Tittu Thomas June 8, 2013 at 10:29 AM

You can use two 100 ohms or 100k ohms resistors in series instead of

220 ohms/Kohms.

6.

situ June 9, 2013 at 6:59 PM

why the 220 ohm resistor gets heated when the circuit is on?

where to connect the negative terminal of battery?

Reply

7.

Kapil Patel June 22, 2013 at 5:47 PM

hey put the relay in last last led to cantrol auto tank

Reply

8.

Tittu Thomas June 22, 2013 at 7:12 PM

Exactly........... You said it right man :)

Reply

9.

Prerna July 10, 2013 at 7:46 PM

why do we need resistors and transistors....the circuit can be completed without them

also...

Reply

Replies

1.

Tittu Thomas July 11, 2013 at 12:48 PM

It doesn't works without Resistors and Transistors. Because pure water

has lower conductivity and this makes the circuit Incomplete.

10.

sindhu July 16, 2013 at 6:15 PM

i tried and unable to make 3rd transistor work can u please suggest what to do in this

site or else to my mail smilesboquet@gmail.com plz reply............. early........

Reply

11.

Ngenet di Rumah July 27, 2013 at 10:18 PM

can the led are changed to relay to turn on or off an AC water pump?

Reply

Replies

1.

Tittu Thomas July 27, 2013 at 10:52 PM

Yes It is possible...!!

12.

Cosmo August 1, 2013 at 6:14 AM

Would this work with a BC548B?

Reply

Replies

1.

Tittu Thomas August 3, 2013 at 9:33 PM

Yes.....

2. Quark August 6, 2013 at 2:04 AM

It only worked after removing the 220ohm, any idea why?

13.

Quark August 15, 2013 at 5:43 AM

With either the BC548b or BC548C the circuit did not work when I have the 220ohm

resistor going to power. The circuit only works when I have the anode of the LED to

power and the resistor in between the LED and the collector of the transistor. Any

ideas?

Reply

14.

Thanga Velu August 17, 2013 at 5:59 AM

is it works in 2n2646 or bfw10 transistor

Reply

15.

Zeeshan Mohammad October 10, 2013 at 10:46 AM

Thanks for the circuit.

Can I expand this circuit to show more than 3 levels?

Suppose i want to show 10 levels, can i add 7 more transistors/resistors/LEDs in the

same fashion?

Reply

Replies1.

Tittu Thomas November 14, 2013 at 6:50 PM

Yes, you can expand the circuit in the same way for more levels...

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