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This is to certify that the research work, "design and construction of a digital soil moisture meter" by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
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This work is on a digital soil moisture meter. Digital soil moisture metermeasures the volumetric water content in soil. Since the direct gravimetric measurement of free soil moisture requires removing, drying, and weighing 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.
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. However, this work focuses on building of a digital soil moisture meter.
TABLE OF CONTENT
COVER PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
TABLE OF CONTENT
CHAPTER ONE
- INTRODUCTION
- BACKGROUND OF THE STUDY
- STATEMENT OF THE PROBLEM
- AIM AND OBJECTIVES OF THE STUDY
- JUSTIFICATION OF THE WORK
- SCOPE OF THE STUDY
- SIGNIFICANCE OF THE STUDY
- MOTIVATION
- THESIS OUTLINE
CHAPTER TWO
2.0 INTRODUCTION
2.1 AUTOMATIC IRRIGATION SYSTEM
2.2 NEEDOF AUTOMATIC IRRIGATION
2.3 MICROCONTROLLER
2.4 SENSORS
2.5 VALVE
2.6 WATERLEVELMONITORING
2.7 ARDUINO UNO MICRO CONTROLLER DESCRIPTION
2.8 LIQUIDCRYSTAL DISPLAY(LCD)
2.9 WATER PUMP
2.10 ACTIVE COMPONENTS
2.11 ACTIVE COMPONENTS
2.12 PASSIVE COMPONENTS
2.13 QUARTZ CRYSTAL OSCILLATORS
2.14 CAPACITOR
CHAPTER THREE
METHODOLOGY
3.0 INTRODUCTION
3.1 BLOCK DIAGRAM OF THE SYSTEM
3.2 HARDWARE (SYSTEM DESIGN AND ANALYSIS)
3.3 SWITCHING UNIT
3.4 RELAY SWITCHING CIRCUIT/CONNECTION
3.5 SENSING UNIT
3.6 OUTPUTUNITS
3.7 TESTING WATER PUMP CONNECTION TO THE ARDUINO
3.8 SOFTWARE DESIGN (PROGRAMMING)
CHAPTER FOUR
4.0 INTRODUCTION
4.1 WORKING PRINCIPLE OF THE OVERALL SYSTEM
4.2 POWER SUPPLY
4.3 RESULT ANALYSIS
4.4 DISCUSSION
CHAPTER FIVE
5.0 INTRODUCTION
5.1 SUMMARY
5.2 CONCLUSION
5.3 RECOMMENDATION
CHAPTER ONE
1.0 Introduction
1.1 Background of the Study
Irrigation is the artificial application of water to the land or soil and it the main area of digital soil moisture meter application. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and vegetation of disturbed soils in dry areas and during periods of inadequate rainfall. When a zone comes on, the water flows through the lateral lines and ultimately ends up at the irrigation emitter (drip)or sprinklerheads.Many sprinklers have pipe thread in lets on the bottom of them which allows a fitting and the pipe to be attached to them. The sprinklers are usually installed with the top of the head flush with the ground surface. When the water is pressurized,the head will pop upout of the ground and water the desired area until the valve closes andshutsoffthatzone.Once there is no more water pressure in the lateral line, the sprinkler head will retract back into the ground.Emittersare generally laid on the soil surface or buried a few inche sto reduce evaporation losses.
Water is a resource that all living species need. It is there for every precious and has to be used with moderation to be preserved for the generations to come. Agriculture is an industry that uses alot of water. Most of the time, this resource is not used efficiently and substantial amounts of water are wasted. In the near future,these wastes will representa large sum of money. The ones who manage this resource efficiently will be winning time and money.
In this project report, a digital soil moisture meteris suggested to minimize the water input and human intervention, while satisfying the plant needs. First, the details of the problem are summarized.The objective andthe scope of the project are described. Some general approaches to the design are reviewed.The results and conclusions of an experiment to determine the required amounts of water are discussed. Then, the suggesteddesign isexplained in detail with the purpose, requirements and constraints, simulation and test results for each of its parts. A brief cost analysis is performed to estimate the viability of such a project on the market. Finally, the design is criticized, and suggestions are made for future improvements.
Digital soil moisture meterdoes the operation of a system without requiring manual involvement of persons. Every irrigation system such as drip, sprinkler and surface gets automated with the help of electronic appliances and detectors such as computer, timers, sensors and other mechanical devices.
Healthy plants can transpire alot of water, resulting in an increase in the humidity of the green house air. A high relative humidity (above80-85%)should be avoided because it can increase the incidence of disease and reduce plant transpiration. Sufficient venting or successive heating and venting can prevent condensation on plants surfaces and the green house structure. The use of cooling systems during the warmer summer months increases the green house air humidity. During periods with warm and humid out door conditions, humidity control inside the green house canbea challenge.Greenhouses located in dry, dessert environments benefit greatly from evaporative cooling systems because large amounts of water can be evaporated into the incoming air, resulting in significant temperature drops.
Since the relative humidity alone does not tell us any thing about the absolute water holding capacity of air,a different measurement is some time used to describe the absolute moisture status of the soil. The vapor pressure deficit is a measure of the difference between the amount of moisture the air contains at a given moment and the amount of moisture it can hold at that temperature when the air would be saturated. Pressured eficit measurement can tell us how easy it is for plants to transpire: higher values stimulate transpiration (but too high can cause wilting), and lower values in hibit transpiration and can lead to condensation on leaf and surfaces.
1.2 Statement of the Problem
Irrigation of plants is usually avery time-consuming activity; to be done in a reasonable amount of time, it requires a large amount of human resources.Traditionally, all the steps were executed by humans. Nowadays, some systemsuse technology to reduce the number of workers or the time required to water the plants.With such systems,the control is very limited, and many resources are still wasted.
Water isone of these resources that are used excessively. Mass irrigation is one method used to water the plant. This method represents massive losses since the amount of water givenisinexcessoftheplantsneed.The excess water is evacuated by the holes of the pots in greenhouses, oritpercolates through thesoil in the fields.
The contemporary perception of water is that of a free, renewable resource that can be used in abundance. However, this is not reality; in many parts of North America, water consumption is taxed. It is there fore reasonable to assume that it will soon become a very expensive resource every where.
In addition to the excess cost of water, labour is becoming more andmoreexpensive.As a result, if no effort is invested in optimizing these resources, there will be more money involved in the same process. Technology is probably a solution to reduce costs and prevent loss of resources.
1.3 Aim and Objectives of the Study
The aim of this project is to build a device that senses soil moisture using microcontroller.
The following are objectives of the studies:
- To reduce human interference and ensure proper irrigation
- To minimize water loss and to maximize the efficiency of water used
- To prevent over labour of the pumping machine and prevent it from getting bad or burned
The following aspects were considered in thechoiceofadesign solution:
- Installation costs;
- Watersavings;
- Human intervention;
- Reliability;
- Power consumption;
- Maintenance;
- Expandability.
A critical consideration is the installation costs, since costs generally determine the feasibility and viability of a project. The installation must be simple enough for a domestic user.The water savings was also an important aspect, since thereisa demand to minimize water loss and to maximize the efficiency of water used. Since the objective is tominimize the costof labour,minimal supervision and calibration must be needed. The system must operate with optimized consistency.The power consumption must also be monitored. Formaintenance,there placement parts must be readily available and easy to install in the case of failure. Finally, the possibility for implementing the system at a larger scale(e.g. in greenhouses) should be investigated.
1.4 Justification of the Work
The increasing world population has led to exponential increase in food demand. This event has necessitated the need for more land to be cultivated. Due to change of weather patterns brought about by global warming, irrigation remains as the only reliable method of crops production. With more and more land now being under irrigation there is a need for optimal use of water.
Over the last few years knowledge in electronics and computation has been used to solve present day challenges. In the forefront of the electronics revolution has been the microcontroller. The microcontroller has been used together with various sensors to measure and control physical quantities like temperature, humidity, heat and light. By controlling these physical quantities using the microcontroller; automatic systems have been achieved.
Irrigation systems in crop production can and has also been automated. This solves the challenge brought about by the unreliability of climate changes thus need for water optimization. Automation of the soil moisture sensor irrigation systems is one of the most convenient, efficient and effective method of water optimization. The systems helps in saving water and thus more land can be brought under irrigation. Crops grown under controlled conditions tend to be healthier and thus give more yields. Controlled watering system results in reduction of fertilizer use and thus fertilizer costs go down.
1.5 Scope of the Study
Thisprojectinvolvestheevolutionof wateringmanuallytowatering automatically. The controlling of the automatic watering system is use in a house, institution or any organization with flowers planted for decoration. Sensorusedto control the watering system is digital soil moisture meter. Other than that, this system should alsomonitorthewaterlevel.
1.6 Significance of the Study
The continuous increasing demand of food requires the rapid improvement in food production technology. In a country like Nigeria, where the economy is mainly based on agriculture and the climatic conditions are isotropic, still we are not able to make full use of agricultural resources. The main reason is the lack of rains & scarcity of land reservoir water. The continuous extraction of water from earth is reducing the water level due to which lot of land is coming slowly in the zones of un-irrigated land. Another very important reason of this is due to unplanned use of water due to which a significant amount of water goes to waste. This problem can be rectified if we use microcontroller based automated irrigation system in which the irrigation will take place only when there will be acute requirement of water.
1.6.1 Advantages of the System
- Saveswater-Studies show that drip irrigation systems use 30-50%less water than conventional watering methods, such as sprinklers.
- Improvesgrowth-Smaller amounts of water applied over a longer amount of time provide ideal growing conditions. Drip irrigation extends watering times for plants, and prevents soil erosion and nutrient run off.Also, because the flow is continuous,waterpenetratesdeeplyintothesoiltogetwelldown intotherootzone.
- Discouragesweeds- Waterisonlydeliveredwhere it's needed.
- Savestime-Settingandmovingsprinklersarenotrequired. Atimerdelayasperenvironment canbeaddedtothesystem forautomaticwatering.
- Helpscontrol fungaldiseases,whichgrowquicklyunder moistconditions.Also,wetfoliagecan spread disease.
- Adaptable-Adripirrigationsystemcanbemodifiedeasily toadjusttothe changingneedsofa gardenorlawn.
- SimplestMethod- Startbydrawingamapofyourgarden andyard,showingthe locationofplantings.Measurethe distancesrequiredforlengthsofhoseorplastictubingtoreach the desiredareas.
1.6.2 Others Advantages
- Highlysensitive
- Worksaccordingtothesoilcondition
- FitandForgetsystem
- Lowcostandreliablecircuit
- Completeeliminationofmanpower
- Canhandleheavyloadsupto7A
- Systemcanbeswitchedintomanualmodewheneverrequired
1.6.3 Area of Application
- Roof Gardens
- Lawns
- Agriculture Lands
- HomeGardens
1.7 Motivation
The increasing demand of the food supplies requires a rapid improvement in food production technology. In many countries where agriculture plays an important part in shaping up the economy and the climatic conditions are isotropic, but still we are not able to make full use of agricultural resources. One of the main reasons is the lack of rains and scarcity of land reservoir water. Extraction of water at regular intervals from earth is reducing the water level as a result of which the zones of un-irrigated land are gradually increasing.
Also, the unplanned use of water inadvertently results in wastage of water. In an Automated Irrigation System using ATMega328, the most significant advantage is that water is supplied only when the moisture in soil goes below a pre-set threshold value. This saves us a lot of water. In recent times, the farmers have been using irrigation technique through the manual control in which the farmers irrigate the land at regular intervals by turning the water-pump on/off when required. This process sometimes consumes more water and sometimes the water supply to the land is delayed due to which the crops dry out. Water deficiency deteriorates plants growth before visible wilting occurs. In addition to this slowed growth rate, lighter weight fruit follows water deficiency.
This problem can be perfectly rectified if we use digital soil moisture meter which help irrigation to take place only when there will be intense requirement of water, as suggested by the moisture in the soil.
1.8 Thesis Outline
This study comprises of five different chapters arranged sequentially. Chapter one gives a brief history of the various forms of locks and their technological advancements. Chapter two explains the operating principles of the various stages involved in the digital combination lock using microcontroller. In chapter three, the design and implementation of the whole project work is discussed fully. Chapter four presents the results and discussions drawn from tests performed on the system, while lastly; Chapter gives a conclusion and recommendation on the entire work.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of a digital soil moisture meter" is also available. Order full work to download. Chapter two of "design and construction of a digital soil moisture meter" consists of the literature review. In this chapter all the related work on "design and construction of a digital soil moisture meter" was reviewed.
CHAPTER THREE: The complete chapter three of "design and construction of a digital soil moisture meter" is available. Order full work to download. Chapter three of "design and construction of a digital soil moisture meter" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of "design and construction of a digital soil moisture meter" is available. Order full work to download. Chapter four of "design and construction of a digital soil moisture meter" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of "design and construction of a digital soil moisture meter" is available. Order full work to download. Chapter five of "design and construction of a digital soil moisture meter" consist of conclusion, recommendation and references.
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