THIAGARAJAR COLLEGE OF ENGINEERING, MADURAI–15
(A Govt. Aided Autonomous Institution, Affiliated to Anna University)
Department of Mechatronics
21MT430 - MICROCONTROLLER
SMART SYSTEM TO REMIND THE USER TO CHANGE
THE FILTER IN RO SYSTEM
Submitted by
M.SATHISH KUMAR – 917721F045
K.J.R.SESH DEVANANDH – 917721F046
Guided by
Dr. S. JULIUS FUSIC
Assistant Professor
&
Mr.MMD.Devarajan
Assistant Professor
THIAGARAJAR COLLEGE OF ENGINEERING, MADURAI-15
(A Govt. Aided Autonomous Institution, Affiliated to Anna University)
BONAFIDE CERTIFICATE
Certified that this Report Titled “Smart system to remind the User to change the
filter in RO filter.” is the bonafide work of M. SATHISH KUMAR (917721F04) &
K.J.R. SESH DEVANANDH (917721F046) carried out the work under my
supervision. Certified further that to the best of my knowledge the work reported herein
does not form part of any other thesis or dissertation on the basis of which a degree or
award was conferred on an earlier occasion on this or any other candidate.
SIGNATURE
DR. S. JULIUS FUSIC
ASSISTANT PROFESSOR
DEPARTMENT OF MECHATRONICS ENGINEERING
THIAGARAJAR COLLEGE OF ENGINEERING,
MADURAI - 625 015
MR.M.M.D DEVARAJAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHATRONICS ENGINEERING
THIAGARAJAR COLLEGE OF ENGINEERING,
MADURAI - 625 015
SMART SYSTEM TO REMINT THE USE RO CHANGE THE FILTER
IN RO SYSTEM
K.J.R Sesh Devanandh
B.E Mechatronics
Thiagarajar college of engineering
Madurai,India
seshdevanandh@student.tce.edu
Abstract—— This project aims to develop a system that
utilizes a TDS (Total Dissolved Solids) sensor to monitor the
TDS levels of water. The system is designed to provide a warning
to the user when the TDS level exceeds 100ppm, which is
considered to be unsafe for drinking purposes. The system uses
an ESP32 controller to interface with the TDS sensor and
display the TDS value and voltage drop on an LCD display. In
addition, the system incorporates a warning mechanism in the
form of an LED that blinks when the TDS level is above the safe
limit and sends a message to the user's mobile phone. The
proposed system can help ensure the safety of drinking water by
alerting users when TDS levels are high.
Keywords—Communication; Total dissolved solids (TDS);
Liquid crystal display; Notification; LED Blinking, ESP32.
I,IINTRODUCTION
Water is an essential resource for human life and one
of the most important aspects of water quality is its
purity. The presence of dissolved solids in water, also
known as Total Dissolved Solids (TDS), is one of the
primary indicators of water purity. TDS levels can vary
greatly depending on the source of the water and the
treatment process it undergoes. High levels of TDS can
be harmful to human health, making it crucial to
monitor and maintain safe levels of TDS in drinking
water.
In recent years, there has been a growing demand for
smart water quality monitoring systems that can quickly
and accurately detect changes in TDS levels. Such
systems can help ensure that the water people consume
is safe and free of harmful contaminants. The
development of such systems has been made possible
by advances in sensor technology and the Internet of
Things (IoT).
The proposed project aims to develop a TDS
monitoring system that uses an ESP32 controller to
interface with a TDS sensor and display the TDS value
and voltage drop on an LCD display. When the TDS
level exceeds 100ppm, which is considered to be unsafe
M. Sathish Kumar
B.E Mechatronics
Thiagarajar college of engineering
Madurai,India
sathishkumarm@student.tce.edu
for drinking purposes, the system triggers a warning
mechanism in the form of an LED that blinks and sends
a message to the user's mobile phone. The proposed
system can help ensure the safety of drinking water by
alerting users when TDS levels are high.
The system has several advantages over traditional TDS
monitoring systems. It is cost-effective, easy to use, and
provides real-time data on TDS levels. It also has the
ability to send alerts to the user's mobile phone, making
it more convenient for users to monitor TDS levels. The
proposed system can be implemented in households,
offices, schools, and other public places where water
quality monitoring is necessary.
In conclusion, the proposed project is a step
towards developing a smart TDS monitoring system
that can help ensure the safety of drinking water. With
the increasing demand for smart water quality
monitoring systems, the proposed system has the
potential to be widely adopted in various settings. The
project also highlights the importance of water quality
monitoring and the role that technology can play in
ensuring safe drinking water.
II.OBJECTIVE & PROBLEM STATEMENT
To make a smart system which reminds the user to
change the filter in the RO system with a help of
warning like LED Blinking and sending notification to
the user with the help of ESP32.
III.
OVERVIEW OF THE DESIGN
Figure 1 shows the proposed smart system to remind
the user to change the RO filter. Which consists of tds
sensor, ESP32 microcontroller, lcd display to show the
tds level and the voltage drop across the sensor. The
warning is given by two way
1) By LED Blinking
2) Sending notification using callmebot
Fig. 3. TDS Sensors
Figure 1: Our design and placement of the
components.
The tds sensor which is sunk in water gives a
electrical conduction through the water. The voltage
drop across the sensor is taken as analog input in ESP32.
The controller continuously senses the voltage and
calculates the tds and shows it in a lcd display and gives
warning above the threshold value.
IV.
The ranges taken were approximately close for the
different fingers and same. The flex resistance values
vary for different sensors. Table I illustrates the
different values for each flex.
TABLE I. TDS value for drinking water prescribed by
WHO, 2008
HARDWARE IMPLEMENTATION OF
THE SYSTEM
The block diagram of the proposed system is shown
in figure 2. It is mainly composed of the TDS Sensor , a
5-Volts power supply, and a hardware circuit. The
inputs are the signs from the TDS sensors that are
connected to the hardware circuit and the power supply.
The hardware circuit includes a TDS Sensor,
microcontroller, LCD Display, LED.
Looking into design, the ESP32(fig 5) controlled the
total system form by receiving output signals from
sensors and processing them into text and displaying
them in LCD Display (fig 6).
TDS sensor
ESP32
LCD Display
LED Blinking
Fig. 5. ESP32.
Fig. 2. Block diagram of the system
The TDS illustrated in Figure 3 are essential
elements that play the role of getting the readings which
are the inputs from the sample water while sensing the
change in the amount of belectrical conduction between
the probes. . They convert the change in bend to
electrical conductance - the more the TDS value more
the electrical conductance.
Fig. 6. LCD Display.
V.
SYSTEM IMPLEMENTATION
water. By utilizing the proposed system, we can
take a step towards creating a healthier and safer
environment for ourselves and future
generations.
After building the hardware, the software is
developed to display the output letters corresponding to
the input information coming from the sensors. The
program starts from the readings of TDS sensors and
converts them into text based on these readings.
For calibrating various text to be displayed we got
the sensor outputs for various sample of water and
tested them for accuracy. After obtaining constant
sensor readings we converted them into text .
To integrate this ESP32, LCD display and a PCB
inside a band, we designed a box which contains the
controller and the display. Only the sensor and the wire
is taken out.
ACKNOWLEDGMENT
The authors would like to acknowledge the valuable
assistance of the our mentors
Dr. S. JULIUS FUSIC
ASSISTANT PROFESSOR
DEPARTMENT OF MECHATRONICS
ENGINEERING
THIAGARAJAR COLLEGE OF
VI. CONCLUSION AND FUTURE PLANS
ENGINEERING, MADURAI - 625 015.
In conclusion, the TDS monitoring system
developed in this project has demonstrated the
potential to provide a cost-effective and
convenient solution for monitoring the quality of
drinking water. The system's ability to interface
with a TDS sensor, display real-time data on an
LCD screen, and send alerts to the user's mobile
phone makes it a versatile and practical tool for
ensuring the safety of drinking water.
Mr.MMD.DEVARAJAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHATRONICS
ENGINEERING
THIAGARAJAR COLLEGE OF
ENGINEERING,
MADURAI - 625 015
REFERENCES
With the increasing concerns over water quality
and the rise in demand for smart water quality
monitoring systems, the proposed system has the
potential to be widely adopted in various settings.
This can help ensure that people have access to
safe and pure drinking water, especially in areas
where water quality is a concern.
In future work, the proposed system can be
further enhanced by incorporating additional
sensors and data analysis algorithms to provide
more detailed and accurate information on water
quality. The system can also be integrated with
cloud-based platforms for remote monitoring and
data analysis.
Overall, this project highlights the importance of
water quality monitoring and the role that
technology can play in ensuring safe drinking
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