This slide was made for our final term project of Electronic Device Course. It was a group work but the slide was made by me. I took help to made this slide. You can see this in the reference part of this slide.

3. Submitted By:
No. Name Student ID Department
01. KHAN, MAHMUD HASAN 14-27873-3 EEE
02. KAMRUZZAMAN, K.M 14-28201-3 EEE
03. ISLAM, MONIRUL 14-27015-2 EEE
04. ARA, HOSNE 13-24060-2 CSE
05. RAHMAN, NISHI 12-22738-3 CSE
06. SHAKIB, MD. NAZMUS 14-27160-2 CSE

5. Applications of Circuit:
This Circuit has a number of practical uses in daily life.
Now no need to go on the roof to check the water level.
Can be used to measure underground storage of water.
Water level Indicator works to maintain a constant water level.
(Used in different Plants and Industries)
Alarm starts ringing as soon as tank becomes full.
It helps to check overflow and wastage of water
by warning the person when the tank is about to brim.
It can also be used to calculate incoming and out going water
in large reservoirs.
It is used to predict the arrival of floods.

6. Motivation:
This circuit is designed to determine the water level
especially in a water tank.
As the water level increases from the base of the tank the number
of glowing LEDS increases subsequently.
Amount of water present in a water tank can be easily measured.

7. Limitation:
 This circuit has some limitations because we have
made it for a small experiment.
So, if we want to implement it for a big tank or
industrial purpose then we have to work more on the
circuit nature. We have to think about the ratio of
it’s cost and facilities too.

9. Components Required:
 Resistors , 330 ohm
 Transistors , BC547
 Power Supply , 9V
 LED
 Sound Buzzer
 Breadboard
 ConnectingWires

10. Short Description:
Resistor:
A resistor is an electrical component that limits or
regulates the flow of
electrical current in an electronic circuit.
Resistors can also be used to
provide a specific voltage for an active
device such as a transistor.

11. Short Description:
Transistor:
A transistor is a semiconductor device used
to amplify and switch electronic signals and electrical
power. It is composed of semiconductor material
with at least three terminals for connection to
an external circuit. A voltage or current applied to
one pair of the transistor's terminals changes the
current through another pair of terminals. Because
the controlled (output) power can be
higher than the controlling (input) power, a transistor
can amplify a signal.Today, some transistors are
packaged individually, but many more are found
embedded in integrated circuits.

12. Short Description:
LED:
Stands for "Light-Emitting Diode." An LED is an electronic
device that emits light when an electrical current is passed
through it. Early LEDs produced only red light, but modern
LEDs can produce several different colors, including red,
green, and blue (RGB) light. Recent advances in LED
technology have made it possible for LEDs to produce
white light as well. LEDs are commonly used for indicator
lights (such as power on/off lights) on electronic devices

13. Working of Circuit:
•When any wire is dipped in water that wire will be connected to
wire through water, establishing a negative voltage across the base
of transistor. Current begins to flow from collector. In this way, LED
glows.
• After successive connections of wires with respective LEDs will
glow, and when wire will be connected, then there will be sound
alarming you that water has attained maximum level and after this
water will flow over.

14. Automatic Water level Controller can be used in
Hotels, Factories, Homes Apartments, Commercial
Complexes, Drainage etc.
It can be fixed for single phase motor, Single Phase
Submersibles,Three Phase motors and open well, Bore
well and Sump.
Automatic water level controller will automatically
START the pump set as soon as the water level falls
below the predetermined level (usually 1/2 tank) and
shall SWITCH OFF the pump set as soon as tank is full.
Fuel level indicator in vehicles.
Liquid level indicator in the huge containers in the
companies.

15. Only 300 BDT need to make this device. It gives a
great output at a very cheap rate. If it need to
convert for industrial purpose then the cost will
extend for connecting wires but the increasing
amount will be very little which is near to the
primary cost.

16. We want to make our
device more Advanced.We
want to add Automatic
Controlling System to our
device.Then the device
will automatically turned
on when the tank is empty
and the device will
automatically turned off
when the tank will be full
of water.

17. In the Earth, the resource of pure drinking water is very
limited. So, we should make the best use of every single
drop of water. Our device will prevent the overflow and
wastage of water. Again, the device saves man power.
So, people can get a great facility by using our device
at a very cheap rate.

18. References:
 www.wikipedia.com
 www.linkedin.com
 www.youtube.com
 www.scribd.com
 Electronic Devices And CircuitTheory
By Robert L. Boylestad and Louis Nashelsky – 8th Edition.
 National Instruments 10.0