This document proposes a mobile framework for real-time monitoring of pH levels in domestic water resources. A sensor device measures pH readings every 15 seconds using a pH probe and circuit. A WiFi module transmits the pH values to a mobile application over a wireless network created by the mobile device. The mobile app displays the pH levels in real-time numerically and graphically to track changes in pH over time. The system aims to provide low-cost, practical water quality monitoring.

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2.  With present environmental pollution, access to clean
water is being limited all over the world
 Typical, laboratory experiments and official water quality
tests take considerable amount of time
 Demand for real time water quality monitoring is ever
increasing
 This project proposes a mobile framework to real time
monitoring of pH value in domestic water resources
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pH stands for Potential Hydrogen
Measures the acid/alkaline level in our water.

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Source: simplifylifeinvizag.blogspot.com/

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Drinking acidic beverages (soda) decreases pH value.
The body begins to extract alkaline minerals such as Calcium,
Magnesium, and Potassium from bones, teeth, and eyes to
restore the balance needed to stay alive.
After years of pulling minerals from different sources : leads to
osteoporosis, bad vision, bad teeth and other illnesses.
The body retains water to dilute the acidity and will store
cholesterol in the arteries to maintain blood pH. No matter
how much you exercise, your body will continue to keep a
tight hold on the fats to protect itself.

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• To design and develop a sensor device to measure
pH level in water.
• To design and develop a communication module to
transmit pH values to a mobile phone using WiFi
• To develop a mobile application to display pH
levels in water in real time in numeric and
graphical form

8.  Concepts of wireless sensor networks and ad-hoc
networking
 Two nodes, one sensor node and one sink node (base
station)
 Sensor node is located where measurements are taken
 Responsible for sending data to the sink node
 Sink node is the mobile device
 Collect sensed data
 Serve data to user
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System Overview

10.  The sensor node
Wi-Fi module (Hi Link HLK-RM04) Microcontroller board (Arduino Uno
Board)
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pH probe pH circuit

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1- Atlas Scientific pH circuit, 2- Atlas Scientific pH probe, 3- BNC connector,
4- HLK-RM04 Wi-Fi module, 5- Arduino Uno board with 32-bit Atmel ARM
Microprocessor, 6- Analog pins, 7- Digital TX and RX pins, 8- 9.0v battery

12.  Obtaining Measurements
 Readings are taken at every 15 seconds
 Output of the pH circuit was ASCII characters
representing the pH value
 Command “R” was used to instruct the pH Circuit to
return a single pH reading
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13.  A Wireless network, created by the mobile device using
Wi-Fi technology
 “http GET” request is used to transmit pH values via WiFi
 Mobile device displays pH value in real time
 GUI is dynamically updated upon receiving data
continuously
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14.  Connecting to the network
 Configuring Wi-Fi Module
 Net mode (Wi Fi Client)
 SSID (AccessPoint)
 Encrypt type (OPEN)
 IP type (DHCP)
 Baud rate (38400)
 Network mode (Client)
 Network protocol (TCP)
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15.  Sending the request
 “In Wi-Fi client mode, it sends data arriving at the serial
port over the network”
 The prepared request is transmitted to the serial port of
the Wi-Fi module
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16.  Creating the network
 android.net.wifi which provides classes to manage a
device’s Wi-Fi functionality
 Activate device’s Wi-Fi hot spot mode
 To configure network settings
android.net.wifi.WifiConfiguration
 Need user permission to access Wi-Fi functionality
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17.  Graphical User Interfaces and Database
 four main GUIs
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pH monitor pH history network settings

18.  The mobile application is tested on a Samsung Galaxy S Duos
2 mobile phone
 Android version 4.2.2
 Wi-Fi 802.11 b/g/n
 Hotspot
 OPEN,WPA
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19.  HLK-RM04 module is very easy to use and cost effective

 Configuration through a web page
 Access point / Wi-Fi client
 Connection to Ethernet
 DHCP and static IP type
 Client / Server
 TCP/UDP
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Cos of wireless
communication modules

20.  Real time pH monitor
 User friendly graphical interfaces
 Log system to store previous records and analyze them
through an auto generated graph.
 Track sudden changes in pH value and identify its
patterns over time (eg. dumping waste into a water
stream results in sudden changes in pH) to generate alarm
 Minimize future risks
 Practical solution to the issue of real time water quality
monitoring
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21.  The sensor device can be designed as a complete water
quality measuring device by adding multiple sensors (eg.
Bio sensors to detect Arsenic in water)
 Handle multiple access of users
 Security issues and the range of the network
 Power saving strategy
 Use of calibration-free pH probes
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