Water level indicator with 7 segment display

1. Wednesday, October 14, 2015

2. Course Code : EEE-220
Electrical
Project
Developments

3. Submission By
• 11010338ID
• 4thSemester
• 8thBatch
• 11010356ID
• 4thSemester
• 8thBatch
RAIHANUL ISLAMMD IMTIAZ UDDIN
BSc in EEE

4. Project Name

5. Project Name
Water Level Meter with
Display

6. Objectives

7. THIS WATER-LEVEL METER USES A 7-
SEGMENT DISPLAY, TO INDICATE THE
WATER LEVEL (LOW, HALF AND FULL) IN
THE TANK. MOREOVER, A BUZZER IS USED
TO ALERT OF WATER OVERFLOWING FROM
THE TANK. THE CIRCUIT SHOWS THE WATER
LEVEL BY DISPLAYING L, H AND F FOR LOW,
HALF AND FULL, RESPECTIVELY.
Objectives of Water Level
Meter with Display.

8. Now the question is What kind of
Equipments we have need to make a
water level meter ?

9. 01 • Resistors (1M & 330Ω )
02 • NOT gate IC 7404
03 • AND gate IC 7408
04 • 7 Segment Display
05 • Buzzer
06 • Switch (ON/OFF)
07 • 9 volt (DC)

10. Circuit Diagram

11. Circuit Diagram

12. Methodology
The circuit uses five sensors to sense the different water levels in the
tank. Sensor A is connected to the negative terminal (GND) of the
power supply. The other four sensors (B through E) are connected to
the inputs of NOT gate IC 7404. When there is a high voltage at the
input pin of the NOT gate, it outputs a low voltage. Similarly, for a
low voltage at the input pin of the NOT gate, it outputs a high
voltage. When the tank is empty, the input pins of IC 7404 are pulled
high via a 1-mega-ohm resistor. So it outputs a low voltage. As water
starts filling the tank, a low voltage is available at the input pins of
the gate and it outputs a high voltage. When water starts overflowing
the tank, pin 13 of gate N6 goes low to make output pin 12. The
buzzer sounds to indicate that water is overflowing the tank and you
need to switch off the motor pump. At that time it will be off
automatic.

13. When water starts overflowing the
tank the buzzer sounds to indicate that
water is over- flowing the tank and we
need to switch off the motor pump.
Although when every pin were make
there ground by filling water then we
have to see the indication L,H &F.

14. Use
 It will be useable for Industry or
residential home.
 Also educational institutions or
Religious prayer place.