Smart pH Sensing with Extended Coverage using Bluetooth �Low Energy 5.0

VIGNESHBALAJI R (3613633)

VISHYANTH S (3613639)

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Dr.Narmadha,M.E.,Ph.D.,

Department of ECE

School of Electrical and Electronics,

Sathyabama Institute of Science and Technology.

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Content

• Introduction
• Literature survey
• Objectives
• Block Diagram of Proposed Work
• Existing method and Proposed method
• Materials used
• Software used
• Bluetooth low energy 5.0
• Circuit connection
• Experimental setup
• 3D Printing box
• Working
• Serial monitor output and Bluetooth terminal output
• Conclusions
• References

INTRODUCTION

• pH measurement techniques have been widely used in chemical, biological, biomedical, and clinical laboratories.
• Our project is to develop a smart pH sensor tag using Bluetooth low energy.
• The floating pH senor can be used in water quality monitoring in aquaculture.
• This device can be used in a mesh network or individually through Bluetooth communication to monitor the pH value in a chemical solution.
• In this device the data is being visualized using a smart phone application for data logging and analysis.

LITERATURE SURVEY

OBJECTIVES

• It comes with BLE 5.0 which has deep sleep mode to save more power.
• It supports our custom product design and smart phone application.
• It is Very portable, water proof and it can float on the top surface of the solution or water.
• It supports Bluetooth low energy mesh.

BLOCK DIAGRAM OF PROPOSED WORK

BLOCK DIAGRAM EXPLANATION

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• From this block diagram, we can clearly see the work flow of the functional modules of the product.

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• Starting from the power source and ending at the Bluetooth transceiver for output the data.

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• This functional block diagram does not include any program algorithms.

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OVERALL DESIGN DEVICE

PRODUCT DESIGN

SMART PHONE APPLICATION

REAL TIME DATA VISUALI--ZATION

EXISTING METHOD

• Consumes 0.5 Amps of power and the battery charge time of 8 hours.
• Hand held device.
• Cost factor of the device is Rs.2500.
• Uses 7-Segment Display to output the data.
• Uses Zig Bee communication when used in wireless sensor network.
• Comes with a separate pH sensor probe and the device is not waterproof.

PROPOSED METHOD

• Consumes only 0.5 Micro Amps of power and with a battery life of 3 Years.
• Uses BLE (Bluetooth Low Energy) communication protocol.
• Comes with Deep sleep mode to save power.
• Comes with custom 3D printing box design.
• Waterproof.
• Very portable and it measures the pH value in a remote environment.
• Cost factor of the device is low compared to the existing system.

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MATERIALS USED

• ATMEGA328: It is a single-chip 8 BIT microcontroller created by Atmel in the mega AVR family and used in our project for all sensor control operations through program.
• BLUESMIRF GOLD: It is a Bluetooth low energy Transceiver developed by Texas Instrument and used in our project as wireless Bluetooth transceiver.
• DF-RB pH SENSOR: It is a pH sensor developed by DF-ROBOT and used in our project for pH sensing.
• TOGGLE SWITCH: It is used as an ON and OFF switch for the entire system through which the power is given.
• 3D PRINTING BOX: It is a enclosure of the product, the experimental setup is place inside the box, which will float on the solution.

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SOFTWARE USED

• ARDUINO IDE: It is a cross-platform application that is written in functions from C and C++. It is used to write and upload programs to Arduino compatible boards.
• SERIAL TERMINAL: It is a serial software used to visualize all the output serial data from the microcontroller through computer.
• BLUETOOTH TERMINAL HC-05: It is an open source mobile application available in play store which is used to visualize all the output serial data from the microcontroller to the mobile through Bluetooth.

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BLUETOOTH LOW ENERGY 5.0

• Bluetooth low energy (BLE) 5.0 is the latest version of the Bluetooth wireless communication standard.
• It consumes low energy and commonly used for wireless headphones and speakers.
• It has an advantage of Deep sleep mode.
• Bluetooth 5.0 is the extension to Low Energy (LE) and its speed is about 48 Mbit/s.
• The ISM range is 2.4-2.485 GHz and maximum distance range of 800ft.

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CIRCUIT CONNECTION

• The A0 pin of the Atmega328 microcontroller is used to get the input from the analog output of the pH sensor.
• Using the pH sensor library, the pH sensor is calibrated as well and the raw data is converted into meaningful data.
• Using the UART serial pins of the Atmega328, the TX of the Atmega328 is connected to the RX of the Bluetooth module and vice versa.
• Thus the two way serial connection is established between the Atmega328 and the Bluetooth module to transfer and receive the data through the smart phone.
• A notification indicator LED light is added to the Atmega328 for indication purpose.
• LM7805 voltage regulator which regulates the voltage and it is introduced between the battery and the input terminal of the Atmega328.
• The positive terminal of the LM7805 is connected to the toggle switch and the toggle switch is introduced between the regulator and the battery to establish the switching operation of the product.

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EXPERIMENTAL SETUP

3D PRINTING BOX

• The first part is the cap, for enclosing our product, through which Toggle switch is fixed on the top of the cap used as an ON and OFF switch for the entire system through which the power is given.
• The second part is the main part and it is used for enclosing our circuit board and in this cylindrical structure basically we will be having the overall product PCB, LED, battery, switch and pH sensor. All these experimental setup are enclosed inside the box and this container is next inserted on the top of the third part.
• The third part is a hollow tyre like structure and this structure has an evacuated chamber with air inside it. This evacuated chamber is used as a float for the entire product. Using this, the entire system starts floating on top of the water.
• The fourth part is the pH sensor which is used for measuring the pH value.

3D PRINTING BOX

PRODUCT DESIGN PARTS

CUSTOM 3D PRINTING DESIGN

WORKING

• The overall setup was enclosed inside the box and this container is next inserted on the top of the hollow tyre evacuated chamber.
• After switching ON the toggle switch, check the LED indicator and open the smart phone android application, connect and pair to the Bluetooth device.
• As soon as the Bluetooth connection is established, the pH sensor starts to send the data serially and the data is being plotted.
• As soon as the device started sending data into the smart phone, take the product and carefully make it to float on the top of the surface of the water where the pH measurement to be measured.
• Now we can start logging our device and plotting the data from the product remotely.

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OUTPUT

SERIAL MONITOR OUTPUT

BLUETOOTH TERMINAL OUTPUT

CONCLUSIONS

• Thereby this device is designed in such a way to enhance the user’s flexibility in wireless data login and remote pH measuring.
• It can be implemented in any water life environment.
• This device can be implemented in fishing areas in oceans for logging the data’s of the marine life environment.
• This floating pH senor can be used in water quality monitoring in aquaculture.
• The floating pH sensor is convenient for the user to take readings in a wide area environment like lakes, farm and marine related areas.

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REFERENCES

• N. A. Cloete, R. Malekian and L. Nair, "Design of Smart Sensors for Real-Time Water Quality Monitoring," in IEEE Access, vol. 4, pp. 3975-3990, 2016.
• M. Mukta, S. Islam, S. D. Barman, A. W. Reza and M. S. Hossain Khan, "Iot based Smart Water Quality Monitoring System," 2019 IEEE 4th International Conference on Computer and Communication Systems (ICCCS), Singapore, 2019, pp. 669-673.
• S. Rafid, F. Redwan, A. H. Abrar, S. N. Uddin Ahmed and B. B. Pathik, "Water Quality Monitoring System: A Sustainable Design," 2019 6th International Conference on Signal Processing and Integrated Networks (SPIN), Noida, India, 2019, pp. 414-419.
• Kiran Patil, Sachin Patil, "Monitoring of Turbidity pH and Temperature of water based on GSM", International journal for research in emerging & Technology, vol. 2, no. 3 March 2015.
• F. Joel Ogbonna, A Amajuoyi Chinomso, Determination of The Concentration of Ammonia That Could Have Lethal Effect on Fish Pond, Nigeria: ARPN Journal of Engineering and Applied Sciences, vol. 5, no. 2, pp. 1-5, 2010.
• B. Das and P. C. Jain, "Real-time water quality monitoring system using Internet of Things," 2017 International Conference on Computer, Communications and Electronics (Comptelix), Jaipur, 2017, pp. 78-82.
• H. Galster, "pH Measurement: Fundamentals, Methods, Applications, Instrumentation", VCH Publishers Inc., 1991.
• B. Yang et al., "Seawater pH measurements in the field: A DIY photometer with 0.01 unit pH accuracy", Marine chemistry, vol. 160, 2014.

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THANK YOU