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“Automatic Control System For Electric
Water Pump For Use In Household Applications”
Under guidance of :
Prof. Dr. Bhupal Singh
Presented by:
Anjali OmerHuma ShireenLipika Jain
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INTRODUCTION
This automatic control system for electric water pumpsenses the water level inside the tank and accordingly
turns on and turns off the motor.
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WHY WE REQUIRE THIS ???
We require this because conventional method has
following drawbacks :
• involve human intervention
• no information about current water level in the tank
• require continuous monitoring
• wastage of water due to overflow
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HOW DOES IT WORK ????
• It has following three sensors
1. High level sensor : determines whether tank is
full or not
: placed near top of tank 2. Low level sensor : determines whether tank is
empty or not
: placed near bottom of tank
3. Supply line sensor : determines whether water
is present in reservoir tank or not
: placed near the bottom of
tank
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CONT………
• Output of these sensors is processed by a logiccircuit which works on the following logic
LLS HLS SLS Output
X X 0 Motor off
0 0 1 Motor on
1 0 1 Motor remains on
1 1 1 Motor off
1 0 1 Motor remains off
0 0 1 Motor again on
0 : water is not present1 : water is present
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CONT……..
• Output of the logic circuit controls the triac whichin turn turns on and turns off the electric watermotor accordingly.
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HOW CAN WE CONSTRUCT IT ????
• Materials required
Equipment Specifications Quantity Price (in Rs)
Electric water motor 2.5 W,50Hz,220V 1
Triac BT 137 1
Opamp IC 741,LM339 2
Transformer 220/12 V 1
nor Gate IC 7402 4 14
Resistors
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CONT……
Equipment Specifications Quantity Price (in Rs)
Capacitors
npn Transistor IC 3904
Stainless steel electrodes
Wires
PCB Board 22
Solder
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CONT…….
• Sensing Circuit
Case I: When water is not present
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CONT….
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CONT……
Case II: When water is present
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CONT…..
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CONT………
• Logic circuit
LLS HLS SLS Output
X X 0 Motor off
0 0 1 Motor on
1 0 1 Motor remains on
1 1 1 Motor off
1 0 1 Motor remains off
0 0 1 Motor again on
0 : water is not present1 : water is present
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CONT………
• If we consider only LLS and HLS, then
LLS HLS Output
0 0 Motor on
1 0 Motor remains on
1 1 Motor off
1 0 Motor remains off
0 0 Motor again on
0 : water is not present1 : water is present
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CONT………
• In short
LLS HLS Output
0 0 Motor on
1 0 No change in previous state
1 1 Motor off
0 : water is not present1 : water is present
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CONT………
• If we invert the output of LLS then
• Above table is similar to the truth table for RS latchwhich is as follows:
LLS’ HLS Output
1 0 Motor on
0 0 No change in previous state0 1 Motor off
R S Q Q’ State
1 0 1 0 Reset
0 0 NC NC No change
0 1 1 0 Set
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CONT…..
• Thus we have
HLS
LLS
RS latch using NOR gate
NOT gate
Q
Q’
LLS’
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CONT…..
• Now we want
• This is possible if we invert the output Q’ such that
• Above can be realized using AND or OR gate
Q Q’ Output
1 0 1
0 1 0
Q Q’’ Output
1 1 1
0 0 0
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CONT….
• Thus we have
HLS
LLS
RS latch usingNOR gate
Q
NOTgate
NOTgate
ANDgate
Q
Q’ Q’’
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CONT…..
• Simplifying
HLS
LLS
Q
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CONT……
• At last considering SLS
• This can be realized using AND gate
Q SLS Output
0 0 00 1 0
1 0 0
1 1 1
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CONT…..
• Thus finally we have
HLS
LLS
SLS
RS latch usingNOR gate
Q
NOTgate
NOT gate
AND
gate
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CONT……
• Final Circuit
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Software SimulationUsing NI Multisim 12.0
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Water is present in water supply line
• Case I: Tank is full
SLS HLS LLS
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Water is present in water supply line
• Case II: User starts using water
SLS HLS LLS
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Water is present in water supply line
• Case III: Tank is empty
SLS HLS LLS
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Water is present in water supply line
• Case IV: Tank is partially filled with water
SLS HLS LLS
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Water is present in water supply line
• Case V: Again tank is full
SLS HLS LLS
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Water is not present in water supply line
SLS HLS LLS
X X
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Physical Model
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CONCLUSION & FUTURE WORK
• Thus we can conclude by saying that it will help in
efficient use of water in household applications andwill prevent the wastage of water, which is one of the major requirement for sustainabledevelopment.
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Thank You !
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Any Questions ????