HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION
FACULTY OF HIGH QUALITY TRAINING
REPORT
C.H.I.T.A
(Control Humidifier In The Air)
Name of Students
Student ID
Đỗ Hồng Quân
19161049
Vũ Đức Thoại
19161029
Nguyễn Phúc Tiến
19161030
Trần Lê Xuân Huy
19161031
Ho Chi Minh City, 6th, January, 2021
HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION
FACULTY OF HIGH QUALITY TRAINING
REPORT
C.H.I.T.A
(Control Humidifier In The Air)
Name of Students
Student ID
Đỗ Hồng Quân
19161049
Vũ Đức Thoại
19161029
Nguyễn Phúc Tiến
19161030
Trần Lê Xuân Huy
19161031
Ho Chi Minh City, 6th, January, 2021
Ho Chi Minh City, January 6th, 2021
RESEARCH PROJECT ASSIGNMENT
Student name:
Student ID:
Student name:
Student ID:
Student name:
Student ID:
Student name:
Student ID:
Major: Electrical and Electronic
Class:
Telecommunication Engineering
Advisor: Nguyen Thoi
Phone number:
Date of assignment:
Date of submission:
1. Project title:
2. Initial materials provided by the advisor:
3. Content of the project:
4. Final product:
CHAIR OF THE PROGRAM
(Sign with full name)
ADVISOR
(Sign with full name)
Ho Chi Minh City, January 6th, 2021
PROJECT EVALUATION SHEET
Student name: ...................................................................................................
Student ID: ........................................................................................................
Student name: ...................................................................................................
Student ID: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Student name: ...................................................................................................
Student ID: ........................................................................................................
Student name: ...................................................................................................
Student ID: ........................................................................................................
Major:................................................................................................................
Project title: ....................................................................................................
Advisor: ...........................................................................................................
EVALUATION
1. Content of the project:
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2. Strengths:
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3. Weaknesses:
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4. Approval for Tech Show? (Approved or denied)
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5. Overall evaluation: (Excellent, Good, Fair, Poor)
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6. Mark: .............. (in words............................................ )
Ho Chi Minh City, January 6th, 2021
ADVISOR
(Sign with full name)
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DISCLAIMER
The information of this project is the opinion or opinion in the article
that is of individual group, not influenced or controlled by any company,
organization or sponsor.
The author always tries to provide accurate and truthful information
to the best of his knowledge.
Over time, technology may change so the content of the article may
no longer be accurate.
One very important thing that people often ignore, is that the product
is only maximized when in enclosed spaces. So if the above condition is
not met, the user should accept certain risks if any.
When reading the content in C.H.I.T.A, it means that you have
accepted the terms of the author mentioned above.
COPY RIGHT
These articles and content are the copyrights of IRONTEAM (except
articles with reference). The author does not agree to arbitrarily take the
content of the article to publish or republish on another website. If you
really want to republish any posts, please quote
The author used images found on the internet. If any images are
copyrighted, the author will always respect.
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ACKNOWLEDGEMENTS
A completed study would not be done without any assistance.
Therefore, the author who conducted this research gratefully gives
acknowledgement to their support and motivation during the time of
this research as a requirement of completing my C.H.I.T.A project.
First of all, I would like to express my endless thanks and gratefulness to
my supervisor Dr. Nguyễn Thới. His kindly support and continuous
advices went through the process of completion of my thesis. His
encouragement and comments had significantly enriched and improved
my work. Without his motivation and instructions, the thesis would have
been impossible to be done effectively. As a part of project:
EXPERIMENT RESULTS AND ANALYSIS, my thesis has been done
by contribution of all relevant students. So far, I would like to thanks to
peoples who took charge in the process of data collection and data entry
for doing this research as a part of the project. I also acknowledge my
thankfulness to all respondents and managements’ branches of AIM
program where data would be collected for their valuable time, kind
assistances and support in participating in the surveys. I would like to
state my thanks to Ho Chi Minh University Of Technology And
Education where supported for the project and provided me lab to
pursuing and completing my degree.
My special thanks approve to my parents for their endless love, care and
have most assistances and motivation me for the whole of my life. I also
would like to explain my thanks to my siblings, brothers and sisters for
their support and care me all the time.
As last, my deeply thanks come to all my friends during time I study in
Việt Nam . Their kindly help, care, motivation gave me strength and lift
up all the trouble for the rest of my life.
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TABLE OF CONTENTS
DISCLAIMER .......................................................................................... 1
ACKNOWLEDGEMENTS ..................................................................... 2
TABLE OF CONTENTS ......................................................................... 3
LIST OF FIGURES .................................................................................. 4
LIST OF TABLES .................................................................................... 5
LIST OF ABBREVIATION .................................................................... 6
ABSTRACT ............................................................................................... 7
CHAPTER 1. INTRODUCTION ............................................................ 8
I. PROBLEM STATEMENT ............................................................ 8
II. CASE STUDY AND CONSTRAINTS ........................................ 8
III. DESCRIPTION OF THE PROJECT ........................................ 9
IV. RESEARCH METHODOLOGY ............................................... 9
V. BRIEF CONTENT ........................................................................ 9
VI. METHODOLOGY..................................................................... 10
CHAPTER 2. LITERATURE REVIEW.............................................. 17
2.1. Background .................................................................................. 17
2.2. Research and review of an existing system (device)................... 24
CHAPTER 3. DESIGN AND IMPLEMENTATION ......................... 27
3.1. Block Diagram............................................................................. 27
3.2. Operation Description ................................................................. 28
3.3. Electrical Design ......................................................................... 30
3.4. Control Design............................................................................. 41
CHAPTER 4. EXPERIMENT RESULTS AND ANALYSIS ............ 45
4.1 . Design Experiments.................................................................... 45
4.2. Operation Experiments ................................................................ 49
4.3. Conclusion ................................................................................... 53
CHAPTER 5. CONCLUSION AND RECOMMENDATIONS ......... 54
5.1. Conclusion ................................................................................... 54
5.2. Recommendations ....................................................................... 54
REFERENCES........................................................................................ 55
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LIST OF FIGURES
Content
Page
Fig 1.1 The current principle creates sound waves
22
Fig 1.2 Describes how sound waves separate water
23
Fig 1.3 Overview diagram of the steam generator
23
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LIST OF TABLES
Content
Page
Time progress table
11,12,13
Cost Management table
14
Risk management table
15,16
Needs table
43
Metrics table
44
List of indirect metrics table
44
Direct dimension and Indirect dimension
45
General specifications for the product
46
Experiment method
47
Table of static test criteria
49
Synthesize Result
50
Power consumption test data
51
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LIST OF ABBREVIATION
No.
Full word
Abbreviation
1
Artificial intelligence
AI
2
Polyamide
PA
3
Control Humidity In The Air
C.H.I.T.A
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ABSTRACT
CHITA is a complete system consisting of a main humidity controller
(Control Humidity In The Air) combined with AI (Artificial Intelligence)
control and many other sensors, ... The main function of CHITA is to
control the humidity of the air in an enclosed environment, with its
sensors CHITA's central control system is AI that will control almost
everything in the air and give appropriate advice to people. use.
Unlike air conditioners that compress the air temperature downwards,
C.H.I.T.A uses water in liquid form and sprayed in steam form to lower
the ambient temperature. Temperature and humidity are two important
factors that directly affect human life. However, since the inception of the
air conditioner, the humidity factor is not considered important and there
is almost no cooling system that uses moisture as the main thing for
cooling. With C.H.I.T.A, the humidity is precisely adjusted between 10%
and 80%. Cooled by humidity completely different from conventional air
conditioner, C.H.I.T.A brings comfort and safety to users. With air
conditioners, the temperature is lowered very quickly and it makes users
susceptible to colds (especially children) as well as lowering the air
temperature for a long time makes users prone to dry skin.
C.H.I.T.A is still an intelligent system with the main ability to
control humidity, but depending on the purpose of the user, the system
may be integrated with more suitable functions. With many outstanding
advantages compared to air conditioners, along with the necessary criteria
of a modern system (the most important one is environmental protection),
C.H.I.T.A will definitely replace traditional air-conditioning in the near
future.
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CHAPTER 1
INTRODUCTION
I. PROBLEM STATEMENT
The main topic of this project is about a humidifier system and our
improvement for the device to be suitable in the environment and condition
of the house. Humidifier is a device that creates water vapor in the air that
increases the air humidity and reduces the ambient temperature. Nowadays
it becomes the device that create mist in the fashion and film industries.
Create better effects in movies.
The smart humidifier has been designed and implemented with some
advanced features as follows:
An auto mode to help save energy with two levels of humidifier: turn
on when under the standard humidity and turn off when it over the limit.
+AI help control
+More function
+Safety and environmentally friendly
II. CASE STUDY AND CONSTRAINTS
Vietnam is located in the humid monsoon tropical climate, together
with urbanization and climate change, the average temperature
(especially in urban areas) is increasing. But the frequent use of air
conditioners increases the greenhouse effect as well as consumes a lot of
electricity. Therefore, finding a more optimal solution to replace the
traditional refrigeration is a pressing problem today. In addition to using
the usual cooling principle of an air conditioner, there is another way that
is to adjust the amount of water vapor in the air. That is also the main
purpose of this project.
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III. DESCRIPTION OF THE PROJECT
The purpose of this project was to focus on steam cooling. Since then,
it shows the superiority of the system compared to other types of
air-conditioning. Towards safe cooling for people and environmental
protection, creating the most favorable environment for people to live.
IV. RESEARCH METHODOLOGY
Scientific research methodology
The method of data collection
Experimental method
Analysis and synthesis method suitable theory
V. BRIEF CONTENT
The following are 6 sections that we will summarize in each project
implementation process:
- Section 1 is introduces the existing humidifier on the market, how we
will develop the humidifier. It is also a brief description of the
humidifier system in this report.
- Section 2 is an assessment of the health effects of moisture on human
health from reliable sources, where the steam generator came from,
and its development in the past and present. A brief introduction to the
system studied in this report is also presented.
- Section 3 is details electronic and mechanical designs, how to choose
the right materials and why. Detailed calculation of the space that the
product operates and the features that the product brings.
- Section 4 is the detail of result of experiment, testing, programming
and troubleshooting.
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- Section 5 is the evaluation, conclusion and recommendation based on
the task work with emphases on the project design and operation. It is
also compared with initial goals of the project.
- Section 6 is the ethics of the project.
VI. METHODOLOGY
1. Objective:
The goal of this project is to design and manufacture an intelligent
humidifier. It possesses the following features and characteristics:
+ Controlled by AI
+ Add moisture absorption feature
+ Natural cooling
+ Save electricity
+ Environmental protection
+ Many new features for each customer
Since then, the scope of this project is limited to research and
implementation. This article shows the research and development of an
affordable SMART humidifier suitable for use in buildings with the main
goal of making it easy, comfortable and safe for everyone to use.
2. Project Management:
Project management is defined as applying specific processes and
principles to accomplish achieve specific goals. It helps team to observe
and control the whole process effectively, enable to solve the problems
rapidly. In this project, there are 5 keys components team will focus are:
scope, time, cost, quality, and risk.
2.1 Scope Management:
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Project scope is a part of project planning that is the key to control
project management success. It is what innovations or changes will be
delivered and the goals from the project in chapter Introduction. The
requirements of the project are:

Easy to use, friendly-used human interface

Working

Convenient and easy to approach

Limit the cost
After the requirements the goals are considered, the scopes are defined
following:

Build cheap SMART air purifier

Using app in IOS and Android to control the air purifier

Concept meets the requirement about standard of indoor quality.
2.2 Time Management:
Time management is defined as organizing or planning how long you
spend your time in specific activities. It is the main key of this project.
Because effective time management permits me to distribute specific time
slots to activities as per their importance. It also affects cost and quality.
In this project, each stage is planned by specific time. Begin with agree
title and brief, then do the literature survey and find the solutions,
materials selections, implementation, write report and presentation.
Table 1: Time progress table
STAGE
UP CONCEPT
Activities
Basic
knowledge
research
11
Start
End
29/11/2020
2/12/2020
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Determine
2/12/2020
2/12/2020
3/12/2020
4/12/2020
Market research
4/12/2020
4/12/2020
Complete swot
4/12/2020
5/12/2020
Buy materials
5/12/2020
6/12/2020
6/12/2020
7/12/2020
7/12/2020
10/12/2020
10/12/2020
12/12/2020
13/12/2020
15/12/2020
15/12/2020
15/12/2020
16/12/2020
19/12/2020
feasibility
Material
planning needed
Proceed to
PROCEED 1
report
Assemble
electrical
components
Testing the
system
Find and test the
code
Combine code
PROCEED 2
with the system
Complete the
whole system
and complete the
content of the
essay
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Complete essay
20/12/2020
21/12/2020
Decorate
21/12/2020
22/12/2020
FINISH
Team Members’ Responsibility:
Đỗ Hồng Quân (leader):
-Purchase materials.
-Design product
-Conducting surveys.
-Prepare presentation slides.
Vũ Đức Thoại:
-Coding ARDUINO for the product.
-Purchase materials.
-Design circuit board.
-Circuit installation
Nguyễn Phúc Tiến:
-Assembling product.
-Purchase materials.
-Assembling product.
-Circuit installation
Trần Lê Xuân Huy:
-Prepare presentation slides.
-Purchase materials.
-Conducting surveys.
3.2.3 Cost Management:
Cost management requires the project must be accomplished on time
and accepted budget. We can do some activities like evaluating,
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budgeting, financing, funding, etc. to improve the cost. Components and
materials need to be defined to manage.
Table 2: Cost Management table
Item
Quantity
Unit Price
Supplier
1
127.500 VND
Available
Fan 5x5 cm
1
21.500 VND
Available
Module Relay 5VDC
1
25.000 VND
Available
Mist generator
1
80.000 VND
Available
Screen LCD 16x2 cm
1
40.000 VND
Available
Mini usb cable
6
48.000 VND
Available
1
300.000 VND
Available
Box
1
20.000 VND
Available
Bottle
2
50.000 VND
Available
ESP-WROOM-32
ESP32 Development Board
Taidacent SHT30 Moisture Sensors
3.3v Outdoor Plant Humdity Sensor
Probe Wate
Total costs
712.000₫
3.2.4 Quality Management:
Quality of a product can be measured in terms of performance,
reliability and durability. Quality management ensures that product is
consistent. In this project, quality management includes planning,
scoping, monitoring and controlling all the aspects of prototype. The
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components and materials selection along with cost and quality
effectiveness are controlled by testing and selling from reputation store.
3.2.5 Risk Management:
Risk Management is one of the important parts in the project, there isn’t
any perfect project that success without any problem. With the Risk
Management Plan, we can decrease the chance of the failure happen and
have the right action for each problem. In the other hand, the plan also
helps reduce level of uncertainty and focus on High – Level Risk.
Table 3: Risk management table.
ID
Description of Risk Impact
Risk Responses
Risk
Level
1
2
3
4
Price of the material Cost over budget
Find cheaper material
is higher than
sources but the quality
expected.
will decrease.
Error in the
Time Consuming
Find the faster ways or
manufacturing.
change the design.
Circuit has problem. The function is not
Check the circuit and
The product did not
stable.
fixing the circuit.
Time Consuming
Check and control with
meet the
required to repair.
requirements in the
test.
15
Medium
High
High
High
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5
The product has
Prototype Quality
small errors.
Check and correct if
enough time.
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Low
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CHAPTER 2
LITERATURE REVIEW
2.1. Background
2.1.1. Air humidity
Air humidity is the term referring to the level of water vapor present in
the air. Some other in-depth concepts related to air humidity include:
 Absolute air humidity: is the amount of water vapor contained
within a unit volume of air.
 Relative air humidity: is a quantity commonly used in everyday
life, only the percentage of water vapor in the air. When the relative
humidity reaches 100%, it means that the air is saturated in terms of
water vapor content.
 Humidity ratioIndicates: the humidity level varies with different
temperature levels.
Measuring indicators related to air humidity play many important roles
in many different areas of life such as agriculture, forestry and fishery,
health, mobility, …
The earth's surface is covered by more than 70% of water coming from
oceans, rivers, streams, and lakes. Under the influence of wind and
sunlight, this water can evaporate and be released into the air. The higher
the temperature, the faster the water molecules move and the chaos
causes more water vapor to be released into the air. This is the main
mechanism of the formation of moisture in the air. Air humidity is
influenced by ambient temperature, pressure and wind. When the air
temperature rises high in the summer months, the humidity in the air falls
low.
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In contrast, during winter months, the air humidity increases highly and
saturation can be reached. Thus, temperature and humidity are two
quantities that have an intimate relationship with each other. Humans
apply this by adjusting the temperature if they want to change and
controlling the humidity at the right level.
The air humidity is said to be high when it exceeds 70%. The air
humidity rises too high to saturation level is the cause of many diseases,
adversely affecting the health of people, especially children and people
with weakened immune systems. Disadvantages caused by too high air
humidity:
 Causes mold, destroying clothing and household items
 Making medical equipment difficult to maintain
 Condensate to walls and floors, surfaces become slippery and easy
to fall
 Bacteria, molds and other microorganisms have conditions for
growth. They are allergens for respiratory diseases such as
pneumonia, bronchitis, bronchial asthma, chronic obstructive
pulmonary disease and a number of other skin conditions.
2.1.2. Effect of temperature
When the air is colder it will not be able to handle as much moisture as
it does with warmer air. Temperature is very important in relation to
humidity, especially when people spend more than 90% of their time
indoors.
Weather: Humidity is lower in colder climates than in warm climates.
Because cold air will hold less moisture than warm air. Therefore, in
winter, the humidity is usually lower. Meanwhile, in summer, the
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temperature will be higher, because when the temperature is high, the air
will contain more water vapor.
Take it every day: Small daily chores can affect humidity levels.
Cooking, cleaning, washing dishes, breathing, washing clothes,
showering and other indoor processes release moisture into the indoor air,
causing indoor humidity to rise.
Maintain moisture at a suitable level:
It is very important to maintain the right humidity for the home. Poor
humidity can affect the health of you and everyone in the house. When
too much moisture can cause humidity and mildew; if too little, the air
becomes dry and uncomfortable.
 High Humidity
Mold
21% of the 21.8 million asthma cases each year are caused by wetness
and mold in the neighborhood. Wet conditions provide a great home for
bacteria, as well as mold growth. Excess humidity in buildings can be
caused by leaks, rainwater seeping through windows and basements; or
even moisture rising from the ground floor.
Asthma, allergies and respiratory diseases
A humidity above 50% is recommended when the air becomes thick
and humid. More problems can develop as levels increase.
Dust mites
Did you know that dust mites cannot survive without moisture from the
air? Dust mites like moderate temperatures and high humidity because
they absorb water from there, so areas with high humidity are great places
for them to live. Microorganisms can aggravate allergies and asthma, so
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maintaining the right humidity is key to minimizing them and their
effects.
 Low humidity
Dry skin and eczema
Itching and dryness can be caused by low humidity. Studies have also
found that low humidity should be avoided in order to protect the tear
film into your eyes. It can also worsen certain skin conditions like
eczema. Too dry air can absorb moisture from your skin and make
eczema worse.
Education
Measurable changes in your ability to focus or do things; can be caused
by small changes in relative humidity and temperature.
Flu
Scientists have found a significant link between low humidity and the
easy spread of flu viruses. One study shows that during peak times of
absolute humidity is low; for example, in winter when the air is dry, the
spread of flu increases.
2.1.3. Based on existing technology
The first air conditioner was born in 1914 by the American engineer
Willis Havilland Carrier. The machine has the ability to regulate the
temperature and create humidity, but not the ability to regulate the exact
humidity.
Today air conditioners have been improved and are much more
compact, but the humidity control function is still not mainly, the
humidity is just an extra feature. Air-conditioners create moisture by
condensing water vapor in the air and returning it to the environment.
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Recently, moisture is generated by the ultrasonic principle. If we
supply it with the same voltage but opposite alternating cycles, the
material will scale according to the frequency of the supply.
This oscillation causes the upper membrane to oscillate (people use this
extra membrane to increase the area in contact with water while
preventing water from falling below).
The water molecules will try to keep up with the vibrations of the
membrane, but cannot due to the relatively large inertia and density of the
water. Since the water waves are phase-lagged relative to the oscillating
membrane waves, creating low-pressure zones between these waves are
called voids (see figure below). These holes contain a lot of energy and
explode near the water surface creating a ripple and undulating wave
peak at the surface, and at the top of the wave, the water droplets are
powered by the holes when it explodes. there is enough energy to escape
the water's surface and shoot into the air in a mist. The size of the dew
particles is very small, only about 1 micro meter in size.
Electric field
Polarization
Expand
Shrink
Fig 1.1 The current principle creates sound waves
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Crest of crossed
capillary
Minute water
droplets
High energy water
jet implding cavity
Cavity
Fig 1.2 Describes how sound waves separate water
Steam
Waternivel
Ultras-one tall
elemental
Fig1.3 Overview diagram of the steam generator
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2.1.4. Advantages and disadvantages
Advantages
Humidifiers cool the air more safely than others: In the summer, the
weather is extremely hot so many people tend to cool the air by using an
air conditioner or fan. However, these devices are not beneficial for the
human skin and respiratory tract. Humidifier with its operation
mechanism has the ability to cool the air much safer than other types of
equipment.
A humidifier to help beautify the skin: One of the most important steps
to taking care of your skin is to moisturize. However, having to sit for too
long in an air-conditioned space makes many people dry, chapped, ... The
humidifier helps maintain a stable air and enough moisture for skin to
replenish moisture profanity.
Humidifiers are good for your respiratory tract: Most diseases related
to the respiratory tract are caused by the surrounding environment. Use a
humidifier to help keep the air fresh, limit bacteria and protect the
respiratory tract in the most optimal way.
+ Air cooling
+ Skincare
+ Limit the growth of bacteria
+ Environmental protection
+ Save electricity
Disadvantages
+ Ineffective with large spaces
+ Affect metal utensils
+ Affect the wall
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+ Can not self-adjust
+ Inability to lower humidity
2.1.5. Type of humidifer
Heat-operated humidifiers
This machine uses heat to heat the water until the temperature is
evaporated, the steam will be spread out through the internal components
of the machine. The heat in the machine helps keep the humidity in the
air at a stable level for the user.
Ultrasonic humidifier
Instead of using hot water, the machine will generate steam by means
of an electromagnetic wave system that oscillates at high frequencies to
help small particles of lithium quickly enter the air like mist, This
machine has the ability to save electricity. is higher than heat-operated
machines but is considered unsafe for inhalation.
2.2. Research and review of an existing system (device)
2.2.1. Existing system
In other to know more the project, research the existing system which
popular in Vietnam will provide more information for us. Here is some
existing system that team is chosen to study:
Philiger PLG - 208 humidifier
The humidifier is especially popular with the Philiger brand.
Possessing the perfect design, compact but full of features of an excellent
humidifier, the Philiger humidifier will be the perfect replacement for
other cooling equipment on the market.
Fatz Baby FB6126JX humidifier
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The product is considered as the perfect solution to cope with the dry
summer weather for mothers and babies. With a very simple usage and
extremely funny shape, the product is currently used by many mothers to
protect the health of their children.
Beurer lb37 humidifier
The machine uses ultrasonic technology to increase the humidity in the
air, helping to save fuel and increase the performance of the machine to
optimal. At the same time, the machine also has a fairly stable quality and
can be used for a long time.
Magic Home HL - H203 moisture mist humidifier
As one of the funniest-shaped humidifiers, Magic Home HL - H203
always attracts the attention of customers who are choosing the most
suitable products for them. The device has an extremely compact design
that simulates a lovely pink pig, providing maximum comfort for the
user.
Fujika FJ-7066 humidifier
With the ability to reduce the room temperature from 5-7 degrees while
ensuring the humidity in the air, Fujika humidifier will give customers the
perfect quality of use and ensure maximum health for the customer.
2.2.2. Review and sollution
Review each existing system:
After conducting the research above, here are some information the team has
learned:
Advantage of all existing system in research:
- Safety, protect human health, energy saving, environmental
protection, more function:
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Disadvantage of all existing system in research:
-
Error: the temperature cannot be accurately controlled
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CHAPTER 3
DESIGN AND IMPLEMENTATION
3.1. Block Diagram
3.1.1. Block Listing
The block diagram will conclude some block following:
+ Power supply
+ Moisture Sensors
+ ESP WROOM 32
+ Module relay
+ Fan 12V AC
+ LCD screen
+ Mist generator
+ Solenoid Valve
3.1.2. Connection
LCD
Screen
Moisture
Sensors
ESP
WROOM 32
Fan
Module
relay
Mist
generator
Solenoid
Valve
Block diagram show the way machine work.
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End
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3.2. Operation Description
C.H.I.T.A will be operated in the following order: the system will be
powered directly to 220v AC to be the Power supply for the machine. The
product will have 2 modes to operate, Mechanical design:
3.2.1. Calculation and Selection
Material
In terms of material selection for the product, we have elaborated on this in
order to decide that we will choose plastic as the main material for the machine.
The following are the reasons that we have decided to choose plastic:
Plastic has properties such as durable, water-proof, easily changeable, and
highly aesthetic. Suitable for many different spaces and styles.
3.2.2. Part list
Front part and LCD screen:
Steam generator and fan:
28
`
Side part and sensors:
29
`
3.3. Electrical Design
3.3.1. List of Components
ESP-WROOM-32
ESP32 Development Board
Figure 3.1: ESP-WROOM-32 Development Board
30
`
Figure 3.2: Datasheet of ESP-WROOM-32
31
`
Figure 3.3: Pinout Diagram of the ESP-WROOM-32
Fan 5x5 cm 12V, 1A
Figure 3.4: Fan 12v AC 5x5
32
`
Module Relay 5VDC
Figure 3.5: Module Relay 5VDC
.
Figure 3.6: Datasheet of Module Relay 5VDC
33
`
Mist generator GT-18 NO.3805
Figure 3.7: Mist generator GT-18 NO.3805
Figure 3.8: Datasheet of the Mist generator GT-18 NO.3805
34
`
Screen LCD 16x2 cm
Figure 3.9: Screen LCD 16x2 cm
Figure 3.10: Datasheet of the Screen LCD 16x2 cm
35
`
Deltrol DC12V Mini Electric DC Solenoid Valve
Figure 3.11: Deltrol DC12V Mini Electric DC Solenoid Valve
Datasheet of Deltrol DC12V Mini Electric DC Solenoid Valve:
1. Inlet diameter: 15.8 MM
2. Output diameter: 15.8 MM
3. Voltage: DC 12V
4. Current: 0.95 A
5. Power: 12 W
6. weight: 210g
36
`
Taidacent SHT30 Moisture Sensors 3.3v Outdoor Plant Humdity Sensor
Probe Wate
Figure 3.12: Taidacent SHT30 Moisture Sensors 3.3v Outdoor Plant
Humidity Sensor Probe Wate
Figure 3.13: Datasheet Taidacent SHT30 Moisture Sensors 3.3v Outdoor
Plant Humidity Sensor Probe Wate
37
`
12 volt power supply
Figure 3.13: 12 volt power supply
3.3.2 Block Diagram
LCD
Screen
POWER SUPPLY
ESP
WROOM 32
Module Relay
Fan
Valve
Moisture
Sensors
Mist
generator
Electrical block diagram explanation:
The power supply will provide the ESP WROOM 32 and Module
Relay, ESP WROOM 32 will receive the data signal from Moisture
38
`
Sensors to determine the value for the fan, valve and mist generator
operated by Module Relay all the data such as temperature and humidity
will be displayed on the LCD screen.
3.3.3. Schematic
Firgure 3.14. Schematic of system
3.3.4. Wiring
39
`
Firgure 3.15. Circuit of system in real.
40
`
3.4. Control Design
3.4.1. Flow Chart
Start
Const ,int and string
Setup pin mode ,bandwith for
displaying in screen
Loop()
Humidity > 80
Fan run
Stop fan, valve and
mist generator
Valve run
Mist generator run
End
41
`
Flow Chart Explanation:
We can see that it is the process of operating the system in order from
top to bottom. First, after the system is powered the sensor will operate
and measure the temperature and humidity in the room. If the humidity in
the room drops below 80%, the system will operate and increase the
humidity in the room. Unless, the system will automatically shut off until
the humidity falls below 80%.
3.4.2. Code for product
Code for ESP-WROOM-32:
#include <SHT1x.h>
#include <Wire.h>;
#include <LiquidCrystal_I2C.h>;
LiquidCrystal_I2C lcd(0x27,16,2);
// Specify data and clock connections and instantiate SHT1x object
#define dataPin 17
#define clockPin 16
#define VCC 12
#define valve 27
byte doC[8]={
B00111,
B00101,
B00101,
B00111,
B00000,
B00000,
B00000,
B00000
};
SHT1x sht1x(dataPin, clockPin);
42
`
void setup() {
lcd.begin(); //Khởi động màn hình. Bắt đầu cho phép Arduino sử dụng
màn hình
lcd.backlight();
lcd.createChar(1,doC);
Serial.begin(115200);
pinMode(VCC, OUTPUT);
pinMode(valve, OUTPUT);
}
void loop() {
lcd.setCursor(0,0);
float temp_c; float temp_f;
float humidity;
digitalWrite(VCC, HIGH); // Read values from the sensor
temp_c = sht1x.readTemperatureC();
temp_f = sht1x.readTemperatureF();
humidity = sht1x.readHumidity();
// Print the values to the serial port
Serial.print("Temperature: ");
Serial.print(temp_c, DEC);
Serial.print("C / ");
Serial.print(temp_f, DEC);
.print("F. Humidity: ");
Serial.print(humidity);
Serial.println("%");
lcd.print("Temp: ");
lcd.print(temp_c);
lcd.write(1);
lcd.print("C");
lcd.setCursor(0,1);
lcd.print("Humi: " );
lcd.print(humidity);
43
`
lcd.print("%");
if (humidity>80) digitalWrite(valve, HIGH); else digitalWrite(valve,
LOW);
}
44
`
CHAPTER 4
EXPERIMENT RESULTS AND ANALYSIS
4.1. Design Experiments
4.1.1. Needs
In order to identify the general needs of the product, we conducted a
small survey with students, university students and workers to get the
most general view. After a few days of surveying, we had the most
general overview of the product and we will take that data to be able to
develop more for the product.
After collecting the data, the following table will be the essential
needs of the product and the important product ratios for that customer.
Table 4: Needs table
Number
Needs
Important
(vote) %
1
The product should have a variety of colours
2%
2
The products should be reasonably priced
18 %
3
The product should have interesting shapes
9%
4
The product should easy to use
1%
5
The product can be used for a long time
20 %
6
The products should be reasonably sized
39%
7
Products can be effective in open spaces
11 %
4.1.2. Metrics
From the general requirements of the customers as the
above table, we will summarize and make a table of metrics to
have a better view of their needs and measurement units and lists.
45
`
Table 5: Metrics table.
Metrics
Unit
M1
Colors
List
M2
Automatic
List
M3
Materials of parts
List
M4
Price
VND
M5
Duration of life
Month/Year
M6
Shape of the product
List
M7
Use Fan to improve the effective
List
Table 6: List of indirect metrics table
List of Indirect Metric
M1
Yellow, red, blue, white, etc.
M2
Auto mode
M3
Wood, hard plastic, stainless steel, etc.
M6
Cylindrical, square, spherical, special form, etc.
4.1.3. Needs – Metrics Correlation
The following will be the units or factors that directly or indirectly
affect the need.
46
`
Table 7: Direct dimension and Indirect dimension.
Need
Metric
M1
1
M2
M3
M4
I
I
4
M6
M7
M8
I
2
3
M5
I
D
D
D
5
D
6
I
7
D
D
Direct dimension
I
Indirect dimension
The reasons why we mark the factors that direct dimension and
indirect dimension affect needs 2, 3, 4 because these needs have many
Metric. Consider the box of need 2, because in order for a product to have
an affordable price, not only the designer calculates the components
inside that product, the material to make will also partially affect the that
product, if the product is made of wood, the price of that product will be
completely different from the product made of metal because the price of
the two materials is different, if the product uses materials more
expensive that make the price of the product will also be expensive. For
need 3, a product with a unique shape to the customer does not
necessarily mean a product with a unique design, but sometimes the
products have simple features along with the harmony with the space. the
customer will order the product will also make the product impressive,
the color is also an important part in this regard, whether the color
47
`
suitable with the space that the customer put or not it will make the
product in that space stand out or not. About need 4, to be able to
effective in open space we use fans to improve steam growth rates and
create a feeling of faster, more efficient cooling in open spaces. The
system is still effective when it is near the user.
4.1.3 Product Specification
Table 8: General specifications for the product.
No.
Specification
name
Important Unit
Ideal value
Marginal
value
1
Colors
2%
List
2
Dimensions
19 %
list
mm
mm
3
Weight
10 %
Gram
(g)
2000 g
1500-2000g
4
Material
12 %
List
5
Sensor
8%
List
6
Microcontroller 5 %
List
7
Fan
16 %
List
8
Lifetime
5%
Years
9
Display screen
3%
List
10
Mode
20 %
List
Type
Basic
years
years
Addition
4.1.4 Experiment Method
Table 9: Experiment method.
Specification
Unit
Sampling
time
Method Description
Total weight
Gram
1
Use scale to measure the
weight of the machine.
48
`
Dimension
Centimeter 1
Use ruler to measure the
dimension of the machine.
Accuracy
%
10
Take the product to a dusty
environment such as a
factory workshop.
Power supply
Volt
1
Use a multimeter to
measure.
Material
List
1
Make a list and buy
materials from the market.
Fan
List
1
Make a list and buy
materials from the market.
Display screen
List
1
Make a list and buy
materials from the market.
Sensor
List
1
Make a list and buy
materials from the market.
Electronic
components
List
1
Make a list and buy
materials from the market.
1
Go to the shop for
counselors and print.
1
Make a list and buy
materials from the market.
10
Shake and simulate light
collision with product
Printed circuit
Microcontroller
List
Reliability of
product
With figures or values we need accuracy, not necessarily absolute
accuracy, just relative and it has a slight degree of intersection in that
range, we will suspect that value, degree. The efficiency of the machine
we have tested has a total of 10 times, for us the number of times make
test this is enough and can ensure accuracy.
4.2. Operation Experiments
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`
In order to test whether the product is stable or not before being
presented to our customers, we have had the actual tests: Static test,
estimating static parameters such as size, weight, hard (physical tests of
the product) and a dynamic test to estimate the performance of the device,
such as whether the power supply is stable or not, whether the code is
stable or not (testing of components electronic inside products).
Making both above test methods to ensure the product is absolutely
safe, no fire or explosion and increase reliability to customers.
4.2.1. Static Test
Static analysis is important for systems that require high safety
criteria, the benefits of when we do Static analysis are the ability to
identify defect early before performing dynamic testing. The cost of
repairing is much cheaper than finding it late in software development
and putting it into use. Prevent design and code defect by uncovering
deficiencies and incorrect system operations. Increased development
performance: for example, design can be improved, easy to maintain
code. To perform this test, we will completely refrain from using the code
to operate, test our calculations and design steps for the product circuitry
to detect potential errors can happen as we connect the power cord to the
pins for ESP WROOM 32 and print circuit design. During the test we
discovered a small error that the code not working properly as required so
we fixed it by changed the code.
In order to ensure our design is safe for users for many different
collision conditions, we have conducted mechanical design tests of the
product,
4.2.2. Mechanical Design
In terms of the mechanical design of the product, we have relied on
the idea of simplifying design of product as much as possible so that it
can suitable with a lot of spaces. Here we have chosen the product as
plastic because it has a quite durable outer layer and is protected by a
plastic layer of plastic PA which is high strength, abrasion resistant as
well as lubricating. In addition, PA plastic also has chemical resistance,
electrical insulation properties as well as shock reduction and reduced
50
`
progress. We have designed the product to have many right angles and
bolted edges to ensure durability of the case when there are collisions.
We performed a few small tests, such as shaking the product, being
lightly bumped with other objects such as balls, the results we received
were very positive, the product was not cracked or damaged on surfaces,
but if bumped in strong situations, the product will also ensure there is
not much damage, only minor cuts caused by sharp points.
4.2.3. Electrical Design
When we completed all the mechanical design tests for the product,
we switched to testing the internal circuitry of the product, first we tested
the all-new electrical wire, No wiring tearing or melting (this may cause
electric leakage and fire). Then we check the line on the circuit board to
match the simulation design (this is very important because just a faulty
path will cause a circuit fire), the next step is we check the power supply
for electronic components is stable so that the product can operate at full
capacity, the final step is that we will run the simulation ARDUINO code
to ensure the product works well.
Table 10: Table of static test criteria
No.
Specifications
Unit
Ideal
value
1
Total weight
Gram
2000 g
90 %
2
Material
List
Plastic
100 %
3
Fan
List
Fan AC
100 %
4
Sensor
List
GT18No.3805
100 %
5
Microcontroller
List
ESP WROOM
32
100 %
6
Display screen
List
LCD
100 %
7
Mode
List
Auto
100 %
8
Dimensions
List
Medium size
100%
51
Marginal
value
Real value
Matched
percentage
`
4.2.3. Dynamic Test
After all static tests have been completed, the next step is to perform
dynamic tests, which will run the code and then execute the test on the
same environment and devices as the actual environment in which the
software / system will be used. We will perform a check of the operation
of the system to make sure the operation of all system.
Table 11: Power consumption test data.
Power supply Consumption (v)
Name of component
Ideal
value
Marginal
value
Test no
Measure value
Result
(%)
ESP WROOM 32
80
80
1
80
100 %
Module Relay
2
2
1
2
100 %
Sensor
63%
63%
1
63%
100 %
To be able to perform the humidity test, we had to check in a very
tight, windless room to get an accurate reading. Not only that, we have to
use the hygrometer to accurately measure the ambient humidity.
4.2.4. Product Quality
The following table will show the synthesize result of the product and
through that team can determine the quality of the product:
Table 12: Synthesize Result
No.
Specification
Unit
1
Total Weight
Gam
2
Dimension
Centimetre
3
Material
List
Ideal
Value
Marginal
Value
Real Value
2000
1500-2000
2000
98%
Medium
Size (25 –
30.5 –
33.5)
Medium Size
(25 – 30.5 –
33.5)
100%
Match
Percentage
Plastic
52
List
Plastic, Steel,
Aluminum
100%
`
4
Sensor
List
GT18No.3805
GT18No.3805
100%
5
Fan
List
Fan 12v AC
50mm
Fan 12v AC
50mm
100%
6
Micro-Controller
List
ESP WROOM
32
ESP WROOM
32.
100%
7
Display Screen
List
LCD
LCD
100%
8
Noise
dB
0 – 10 dB
5dB
90%
9
Colours
List
Brown
Brown, Yellow,
Red.
100%
10
Mode
List
Auto
Auto
100%
Result
0 dB
Percent of static test: 98.18%
Percent of dynamic test: 99.42%
Overall:
98.8%
From the table above we can see that the percentage of dynamic and
static testing is very high, from which the overall test of the machine is
greatly appreciated. Thereby we can see that the machine works really
dark with the functions that it brings. The data we have measured from
the actual value compared to the estimated value is not much difference,
which proves that the machine can guarantee the benefits that it brings.
4.3. Conclusion
From all the test above, we can see that the result is the great success.
But due to the in experience and lack of testing equipment, the test may
not conduct all the important characteristic and not exactly correct.
However, the air purifier is working and actually accomplish the
objective of the project.
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`
CHAPTER 5
CONCLUSION AND RECOMMENDATIONS
5.1. Conclusion
The machine has high durability and did not detect any errors
during our testing.
The system works well in closed environments like bedrooms and
living rooms.
The system creates a better living environment for users, safe
cooling and a pleasant feeling. 100% Test participants found steam
cooling much more comfortable than air-conditioning. Save twice as
much energy as air-conditioner (verified). Do not pollute the
environment.
The system is completely automatic, controlled by AI. Easy to use,
safe for children and make no noise when operating.
5.2. Recommendations
Use additional fans to increase efficiency.
Secure an enclosed space and incorporate a ventilation fan system
to reduce humidity when needed.
Choose the right electrical equipment and paint the wall.
Keep metal utensils in the right place.
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`
REFERENCES
Wikipedia (n.d). Humidity. Retrieved from
https://en.wikipedia.org/wiki/Humidity
What is Humidity (n.d).How temperature affects indoor and humidity
levels. Retrieved from
https://www.airthings.com/what-is-humidity
Benjamin Elisha Sawe (2017, April 25). What Is Humidity And How
Does It Affect Life On Earth? Retrieved from
https://www.worldatlas.com/articles/what-is-humidity-and-how-does-it-af
fect-life-on-earth.html
Tịnh Nguyễn (2020, June 29).Rate the top 8 best humidifiers to buy 2020.
Retrieved from
https://chanhtuoi.com/may-phun-suong-tao-am-p2025.html
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