By T.SELVALAKSHMI, FINAL YEAR ECE DR.G.U.POPE COLLEGE OF ENGINEERING, SAWYARPURAM

1. SIMPLE AUTOMATIC
WATER LEVAL
CONTROLLER
BY
T.SELVA LAKSHMI
FINAL YEAR ECE
DR.G.U.POPE COLLEGE OF ENGINEERING,
SAWYARPURAM

2. ABSTRACT
 People generally worry about the wastage of
water , when they switch ON the motor, but
forget to OFF them.
 Our idea may help them in saving water for
future with low cast.

3. CONTENTS
 Introduction
 Components required
 Block diagram
 Circuit diagram
 NE 555 IC
 NE 555 pin configuration
 Purpose of NE 555
 Level indicator
 Sensor unit
 Control unit
 Working principle
 Circuit operation
 Advantages
 Disadvantages
 Applications

4. INTRODUCTION
 Our project mainly consist of 555timer , 12V motor
,Relay and wires which acts as sensor.
 The wires are placed at the different levels of the tank.
 All these mentioned components take an active role in
switching ON and OFF of the motor.

5. COMPONENTS REQUIRED
 Power supply (12V)
 NE 555 timer IC
 Resistor (100 ohm-(2),1K ohm)
 D.C motor(12V)
 LED
 BUZZER
 Relay
 Connecting wires

6. BLOCK DIAGRAM

7. CIRCUIT DIAGRAM

8. NE 555 IC

9. INTERNAL STRUCTURE OF NE 555

10. PURPOSE OF NE 555
In this circuit the NE 555 works as a
comparator as well as a controller for
controlling the circuit operation.

11. SIMPLE WATER LEVEL CONTROLLER
Sensor
unit
Level
indicator
Control
unit

12. LEVEL INDICATOR
 The LED and BUZZER was used as a level indicator.
 When the water is in lower level , it was indicated with the help
of LED.
 When the water level is LOW the LED is glow.
 When the water level is goes high , then it was indicated with the
help of BUZZER.
 When the water is level is high then the BUZZER is switched
ON.

13. SENSOR UNIT
 In this circuit the connecting wires are used as a sensor, which
sense the level of water in the tank with the help of supply.
 In general the aluminum wire is used.
 The wires are connected on the tank and the power supply is
given through the wire to the water tank.
 The connected wires in LOW and HIGH position conduct the
electricity through water and sent these power to NE 555 for the
control of the motor operation.

14. CONTROL UNIT
 The NE 555 plays a main role in control unit .
 The NE 555 reciveces the signal from the sensor unit and generate the
output signal which was used to control the motor operation.
 If the water level in the tank is LOW then the output of the NE 555 is
HIGH , which switch ON the motor.
 If the water level in the tank is HIGH then the output of the NE 555 is
LOW , which switch OFF the motor.

15. WORKING PRINCIPLE
 This system mainly works on the principle that “ water
conducts electricity” .
 The four wires which are dipped into the tank will
indicate the different water levels.
 Based on the output of these wires ,the NE 555 timer
generate the signals which control the operation of the
motor.

16. CIRCUIT OPERATION
 When the 9V battery connected to the circuit , if
the water level of the tank low the NE 555 output
is high , which run the motor.
 If the water tank is full then NE 555 output is
low or even zero , which OFF the motor.

17. CIRCUIT OPERATION
 In this circuit NE 555 timer works as a controller
, which control operation of the motor.
 If water level is goes low then the NE 555 timer
output is high or maximum level which again run
the motor until when the tank is full.

18. ADVANTAGES
 Low maintenance.
 Compact and good design.
 Fully automatic.
 Saves water , energy.
 Increases pump life.

19. DISADVANTAGES
 This project may not be able to handle high power.
 The components used in this are sensitive and may
damage easily.
 We need to insert the wire in accordance with the
level of water.

20. APPLICATIONS
 It is used for all household purpose.
 It can be used in commercial centers.
 It will be very much useful to farmers.
 It can be used in all places to control water level.

21. CONCLUSION
This project involved designing simple
automatic water level controller with
low cast and using few components.

23. ANY QUESTIONS