This document presents a water level indicator circuit that uses three transistors and LEDs to indicate the water level in a tank. As the water level rises, it makes contact with the transistor bases at different heights, causing the corresponding LEDs to light up. When the water reaches the highest level and activates the third transistor, a buzzer will sound to indicate that the tank is full. The circuit uses inexpensive and easily available components like transistors, LEDs, resistors, and a buzzer. It provides a low-cost solution to monitor water levels and prevent overfilling without consuming much power.

1. WATER LEVEL
INDICATOR
Presented to:
Sir Shahbaz
Presented by:
M.Waqar Azeem (19-EE-187)
Aneeq Akhalaq (19-EE-023)
Zahid(19-EE-025)

2. Content
Group 2
• INTRODUCTION
• APPARATUS
• CIRCUIT DIAGRAM
• NEEDS AND USES
• WORKING
• CONCLUSION

3. INTRODUCTION
• Water level indicator used to express the level of
water in water tank and boiler etc. different
types of water level indicator are available in
market like mechanical and electronics.
• This circuit not only indicates the amount of
water present in the tank but also gives an
indication when the tank is full. As the water
continues to fill the tank, the LEDs light up
gradually.
Group 2

4. APPARATUS
• Transistor BC-547:
BC547 is an NPN Bipolar
Junction Transistor. Mostly it is
used for the switching purpose as
well as for amplification purposes.
• LED:
A light-emitting diode (LED) is a
semiconductor light source that
emits light when current flows
through it.
Group 2

5. • RESISTOR:
A resistor is a passive two-terminal
electrical component that
implements electrical resistance as
a circuit element. In electronic
circuits.
• BUZZER:
A buzzer or beeper is an audio
signaling device, which may be
mechanical, electromechanical, or
piezoelectric (piezo for short).
Group 2

6. Circuit Diagram
Group 2

7. NEEDS:
• Over flow problems
• To prevent waste of
• To prevent waste of water
• Attention
ADVANTAGES:
• Easy installation.
• Low maintenance.
• Compact elegant design
• Consume very little energy, ideal for continuous
operation.
Group 2

8. WORKING
• After the connections are made as per the circuit
diagram the circuit is then excited by 9V battery. The
positive terminal of the battery is given to bottom of the
measuring tank measuring tank that generates the flow
of ions in the liquid present in tank. The base of the
three transistors makes contact with the water at three
different levels such as low, medium and high. When
the base terminal makes the contact with the water the
current starts to flow from base to emitter terminal. This
current flow in the emitter terminal makes the LED to
glow at different levels. If the water level is full, then the
circuits beep through the buzzer notifying that the water
level is full.
Group 2

9. • We conclude that this is one of the simplest model
used as water level indicator which can be made at
your home with very less cost specific items that
will be done
• This setup consumes only 9V therefore it does not
produce an electric shock when we touch the water
in the measuring tank.
CONCLUSION
IMAGE
Group 2

10. THANKS
Group 2