Water level indicator and controller
Generally overhead tanks are filled with water by operating a pump. We have no control over the level to which it may be filled. It may cause overflow or water level may remain too low when we switch OFF the pump motor. Manual operation of the motor pump starter is thus not advisable. Present circuit may be added to the existing manual starter of the pump motor so that it may be operated automatically.
Four sensor probes made up of brass or stainless steel stiff wires or rods may be hung firmly in the tank. This indicates the water level in the water tank at four steps F, H, L, E i.e., Full, Half, Low, Empty. When there is no water in the water tank the circuit automatically switches ON the pump and switches OFF when the water level comes to Full.
Probes marked E and L are hung with their bottoms near the bottom level of the tank at which we wish to start the pump. The probe F is hung with its bottom end in between those probes E and F. It is used for indication of the middle level.
Sensor H, L, F are connected with resistors R1, R2, and R3, where as probe E is directly connected to ground. Resistors R1, R2, R3 are connected to 12V supply through resistors R4, R5 and R6 respectively.
Working:
When the water level in the tank is below probes E and L, output of gate N9 is logic low and output of gate N12 is latched to logic high level. Simultaneously output of gate N11 goes logic low and is inverted by inverter. Now the output of gate N10 becomes logical high, and thus the transistor is forward biased to ON state and the relay is energized. These results in shorting of power supply contact to the pump and thus switching ON the pump motor.
As the water starts filling in the tank and ultimately touches probe F, the output of gate N11 goes high and is inverted by inverter. Now the output of gate N10 becomes logical low, and thus the transistor is reverse biased to OFF state and the relay is de-energized. These results in opening of power supply contact to the pump and thus switching OFF the pump motor.
Water level states are displayed using IC 5 and IC 6 in conjunction with 7-segment display. The display indicates F for Full, H for Half, L for Low and E for Empty level condition.
![Circuit diagram of Water level indicator and controller Circuit diagram of Water level indicator and controller](https://studentprojects.in/wp-content/uploads/2008/11/waterckt.jpg)
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al-marsa87@hotmail.com
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I am a student of b.tech(EC) final year
I’m interested in this project.
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I am a student of b.tech(EC) final year
I’m interested in this project.
Can you please send me all the details and circuit diagram of this project with component list with its spacification.
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DEAR SIR,
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How would it be possible to start the motor between specific hours of the day. As you know in city , power supply is available for a certain fix hours . I would like to have some idea from upon this.
*Water supply