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Application of PLC in Agriculture for Irrigation and Fertilizer sprinkling
SRIDHAR RAJA D1, B.KALAISELVI
2, ABINETHRI R
3 T.VIJAYAN
4
1, 2, 3,4Assistant Professor, Dept. of Electronics & Instrumentation
BIST, BIHER, BHARATH UNIVERSITY, Chennai – 73.
Abstract:
In recent times automation based on PLC is increased in almost all industry environments.
This paper presents an automatic irrigation system based on PLC employing moisture and PH
sensors. The function of soil moisture sensor is to identify the amount of water required for
irrigation; PLC then controls the water pump through a relay and a solenoid valve based on
moisture content that is less or at correct level. Fertilizer spraying system is also added to the
water irrigation system based on pH content in the soil. If PH level is less than 5.5 or higher than
7 that is if it is more acidic or becoming neutral then spraying motor is turned off and particular
solenoid valve is closed. Agriculture using automation techniques like Automatic moisture
detection and water sprinkling system and fertilizer spray system according to predefines time
interval and fertilizer spray cut off due to high or lower pH value than the optimum pH value for
healthy plant growth, by this system agriculture can be done efficiently and lead to increase in
crop production and quality. The proposed automation scheme is implemented in real time using
Siemens LOGO PLC platform and it produced an automatic irrigation system which also
minimizes the cost required during irrigation.
Keywords: Programmable logic controller, moisture sensor, pH sensor, solenoid valve, relay,
automatic irrigation system.
I. Introduction
Irrigation is the most important cultural practice and most labor task in daily agriculture
sector. To do this automatically[1-6], sensors and methods are available to determine when
plants may need water. Automation involves improving the speed of production[7-9], reduction
of cost, effective use of resources. The main objective of this paper is to develop a PLC system
to irrigate the plant automatically[10-16]. This project is also to send a short message service
(SMS) to farmer and motor ON and OFF condition. Many sensors are used in our project. There
are ph sensor and soil moisture sensor. By using these sensors, we can find whether the soil is
wet or dry. If it is dry, pumping motor will pump the water[17-21]. Bio electrodes are used to
measure the nutrient content of plant. In this system, the main controlling device is PLC. The
pumping motor will pump the water into the field by until the field is wet which is continuously
monitor by the PLC. A PLC is a control system that continuously monitors the state of
International Journal of Pure and Applied MathematicsVolume 119 No. 12 2018, 2833-2844ISSN: 1314-3395 (on-line version)url: http://www.ijpam.euSpecial Issue ijpam.eu
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input device and makes decision based upon the program to control the state of output devices.
PLCs are ―Programmable Logic Controllers‖ that are being used in manufacturing processes.
As already mentioned the project of this research is to develop an economical PLC based
irrigation controller that automatically adapts the actual weather conditions, using simple sensors
and carries out the irrigation accordingly. It is done through narrow tubes that deliver water
directly to the base of the plant. A PLC is a control system that continuously monitors the state
of input device & makes decision based upon the custom program to control the state of output
devices. PLCs are ―Programmable Logic Controllers‖ that are being used extensively in
manufacturing processes. As already mentioned the aim of this research is to develop an
economical PLC based irrigation controller that automatically adapts the application depths to
actual weather conditions, using simple sensors and then carries out the irrigation accordingly. In
this paper we are implementing Automatic drip irrigation by sensing the Moisture of the soil, pH
sensor.
II. Related Works
Niteen Naik, Rohit Shinde, Ganesh patil, Navnath margale presented ―AGRICULTURE
AUTOMATION USING PLC‖ In India, the market is mainly based on agriculture and the
climatic environment is isotropic and is not able to make full use of agricultural assets. The main
cause is the lack of rains in many parts of India and scarcity of land water. Manual control
irrigation techniques lead to many problems like additional water consumption, delayed water
supply, additional or insufficient fertilizer consumption, bad quality of fertilizer preparation etc.
Agriculture using automation techniques like Automatic water dripping system, Automatic
chemical spray system and Automatic chemical preparation system can do agriculture efficiently
and lead to increase in crop production and quality[22-26].
Santosh, Sanket, Shriyo, Sugandha ―Plc Based Automated Drip Irrigation‖ Drip Irrigation is
a progressing technology in the field of Agriculture and irrigation. 'Drip irrigation, is an
irrigation method that saves water and fertilizer by allowing water to drip slowly to the roots of
plants, either onto the soil surface or directly onto the root zone, through a network of valves,
pipes, tubing, and emitters. Use of automated drip irrigation we can save more water & increase
our economy by increasing production with less man power. The major part of agriculture is the
efficient use of water for irrigation, where it is not feasible to implement full scale evaporate
transpiration based irrigation controller. During the growth season crop water does not remain
constant and varies depending on the canopy[27-35], climate conditions such as temperature,
wind, relative humidity and solar radiation. Thus, it is necessary to find an economic irrigation
controller that can adapt the daily water application as per the plants requirement. Due to
development of programmable logic controller (PLC) and their affordable price has made it
possible to use them as stand-alone irrigation controllers.
International Journal of Pure and Applied Mathematics Special Issue
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L. SAROJINI, J. JENIFAR, M. MYTHILI, This project aims to develop the automated drip
irrigation using PLC and biosensors for monitoring and managing the agriculture field. Drip
Irrigation is a progressing technology in the field of Agriculture and irrigation. It is an irrigation
method that saves water and fertilizer by allowing water to drip slowly to the roots of plant,
through a network of valves, pipes and emitters. Automatically water will irrigate 4hrs/day at
near the root of the plant through emitters using biosensors and also fertilizers are supplied to the
plant 3 days once. By using drip irrigation the water will be maintained at the constant level i.e.
the water will reach the roots drop by drop.
III. Proposed Automation system for Agriculture Applications
Overall structure of proposed irrigation system based on PLC is shown in the figure1.
Siemens LOGO PLC acts as main controller of the system. The main objective of the PLC is to
read sensors and generate output based on logic created in program. PLC have faster response
when compared to microcontrollers and it has long operating life programming too easy
compared to Any PLC can be programmed in two ways either by ladder logic programming or
by using structured text method. Ladder logic is quite simple to develop and understand program
but it goes lengthy when the system involved is larger[36-39]. In this system two main motors
are used one for water pumping and other for spraying fertilizers. Both the motors operate on
single phase nominal ac voltage and controlled by PLC using relays. The contactor type relays
are used which based on energizing signal from PLC either turns on or off motor. A solenoid valve is an
electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; it cuts or open flow of
water or fertilizer in our system.
Figure1. Block Diagram of automated irrigation system using PLC
International Journal of Pure and Applied Mathematics Special Issue
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Soil moisture sensors measure the volumetric water content in soil. Since the direct gravimetric
measurement of free soil moisture requires removing, drying, and weighting of a sample, soil
moisture sensors measure the volumetric water content indirectly by using some other property
of the soil, such as electrical resistance, dielectric constant, or interaction with neutrons, as a
proxy for the moisture content[40-42]. A pH Meter is a scientific instrument that measures the
hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as
pH. Here pH measurement is made for finding if it is not in the optimum range.
Start
Read Moisture sensor & pH sensor
If Moisture % <35
If pH value <5.5 && >7
YES
NO YES NO
Turn on pump & Turn off pump & Turn off motor & Turn on motor &
solenoid valve solenoid valve solenoid valve solenoid valve
Stop
Figure2. Flow chart depicting logic involved in program
International Journal of Pure and Applied Mathematics Special Issue
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A. Water Pumping motor
A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical
action. Pumps can be classified into three major groups according to the method they use to
move the fluid: direct lift, displacement, and gravity pumps. Pumps operate by some mechanism
(typically reciprocating or rotary)[43-45], and consume energy to perform mechanical work by
moving the fluid. Pumps operate via many energy sources, including manual operation,
electricity, engines, or wind power, come in many sizes, from microscopic for use in medical
applications to large industrial pumps. Mechanical pumps serve in a wide range of applications
such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car
industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural
gas or for operating cooling towers. In the medical industry, pumps are used for biochemical
processes in developing and manufacturing medicine, and as artificial replacements for body
parts, in particular the artificial heart and penile prosthesis. Single stage pump – When in a
casing only one impeller is revolving then it is called single stage pump. Double/multi-stage
pump. When in a casing two or more than two impellers are revolving then it is called
double/multi-stage pump.
B. Relay A contactor is an electrically controlled switch used for switching an electrical power circuit,
similar to a relay except with higher current ratings and a few other differences. A contactor is
controlled by a circuit which has a much lower power level than the switched circuit. Contactors
come in many forms with varying capacities and features. Unlike a circuit breaker, a contactor is
not intended to interrupt a short circuit current. Contactors range from those having a breaking
current of several amperes to thousands of amperes and 24 V DC to many kilovolts. The physical
size of contactors ranges from a device small enough to pick up with one hand, to large devices
approximately a meter on a side. Contactors are used to control electric motors, lighting, heating,
capacitor banks, thermal evaporators, and other electrical loads.
Figure3. 12v contactor Relay
International Journal of Pure and Applied Mathematics Special Issue
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C. Solenoid valve
A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric
current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the
case of a three-port valve, the outflow is switched between the two outlet ports. Multiple
solenoid valves can be placed together on a manifold. Solenoid valves are the most frequently
used control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix
fluids. They are found in many application areas. Solenoids offer fast and safe switching, high
reliability, long service life, good medium compatibility of the materials used, low control power
and compact design. Besides the plunger-type actuator which is used most frequently, pivoted-
armature actuators and rocker actuators are also used. There are many valve design variations.
Ordinary valves can have many ports and fluid paths. A 2-way valve, for example, has 2 ports; if
the valve is open, then the two ports are connected and fluid may flow between the ports; if the
valve is closed, then ports are isolated. If the valve is open when the solenoid is not energized,
then the valve is termed normally open (N.O.). Similarly, if the valve is closed when the solenoid
is not energized, then the valve is termed normally closed. There are also 3-way and more
complicated designs. A 3-way valve has 3 ports; it connects one port to either of the two other
ports (typically a supply port and an exhaust port).
Figure4. Two port Solenoid valve
D. Soil Moisture Sensor Soil moisture sensors measure the volumetric water content in soil. Since the direct gravimetric
measurement of free soil moisture requires removing, drying, and weighting of a sample, soil
moisture sensors measure the volumetric water content indirectly by using some other property
International Journal of Pure and Applied Mathematics Special Issue
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of the soil, such as electrical resistance, dielectric constant, or interaction with neutrons, as a
proxy for the moisture content. The relation between the measured property and soil moisture
must be calibrated and may vary depending on environmental factors such as soil type,
temperature, or electric conductivity. Reflected microwave radiation is affected by the soil
moisture and is used for remote sensing in hydrology and agriculture. Portable probe instruments
can be used by farmers or gardeners. Soil moisture sensors typically refer to sensors that estimate
volumetric water content. Another class of sensors measure another property of moisture in soils
called water potential; these sensors are usually referred to as soil water potential sensors and
include densitometers and gypsum blocks.
Figure5. Soil moisture sensor
E. PH Sensor
A pH Meter is a scientific instrument that measures the hydrogen-ion activity in water-based
solutions, indicating its acidity or alkalinity expressed as pH. The pH meter measures the
difference in electrical potential between a pH electrode and a reference electrode, and so the pH
meter is sometimes referred to as a potentiometric pH meter. The difference in electrical
potential relates to the acidity or pH of the solution. The pH meter is used in many applications
ranging from laboratory experimentation to quality control. Potentiometric pH meters measure
the voltage between two electrodes and display the result converted into the corresponding pH
value. They comprise a simple electronic amplifier and a pair of electrodes, or alternatively a
combination electrode, and some form of display calibrated in pH units. It usually has a glass
electrode and a reference electrode, or a combination electrode. The electrodes, or probes, are
inserted into the solution to be tested.
Figure6. PH chart showing acidic and base pH levels
International Journal of Pure and Applied Mathematics Special Issue
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Figure7. PH Sensor
Conclusion
This paper presented an automatic irrigation system based on PLC employing moisture and PH
sensors. The function of soil moisture sensor is to identify the amount of water required for
irrigation; PLC then controls the water pump through a relay and a solenoid valve based on
moisture content that is less or at correct level. Fertilizer spraying system is also added to the
water irrigation system based on pH content in the soil. If PH level is less than 5.5 or higher than
7 that is if it is more acidic or becoming neutral then spraying motor is turned off and particular
solenoid valve is closed. The PLC has been used to control Water supply motor and Solenoid
valve according to the moisture content in the soil, to apply fertilizer timely by switching on the
fertilizer motor and solenoid valve and continuous monitoring of pH level and stop supply of
fertilizer if the pH is Lower or greater than the optimum pH valve for plant growth. By this water
management is archived by reducing the over watering of plants and over sprinkling of fertilizer.
This improves the crop quality and quantity in lower cost than conventional method. The
purpose of this project is to perform a proof of concept study on Agriculture automation using
PLC.
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