Journal of ISMAC
IRO Journals
Volume 8 — Issue 1 — March 2026

Li-Fi Based Optical Wireless Transmission of Alphanumeric and Temperature Data for Smart Indoor Systems

https://doi.org/10.36548/jismac.2026.1.001
Pages: 1-14
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Prarthana P. Bhat
Department of Electronics and Communication Engineering, K. S. Institute of Technology (KSIT), Bengaluru, India
Sharanya S.M.
Department of Electronics and Communication Engineering, K. S. Institute of Technology (KSIT), Bengaluru, India
Shraddha E.N.
Department of Electronics and Communication Engineering, K. S. Institute of Technology (KSIT), Bengaluru, India
Tejaswini L. Yadav
Department of Electronics and Communication Engineering, K. S. Institute of Technology (KSIT), Bengaluru, India
Electa Alice Jayarani A.
Department of Electronics and Communication Engineering, K. S. Institute of Technology (KSIT), Bengaluru, India
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How to Cite

Bhat, Prarthana P., Sharanya S.M., Shraddha E.N., Tejaswini L. Yadav, and Electa Alice Jayarani A. 2026. “Li-Fi Based Optical Wireless Transmission of Alphanumeric and Temperature Data for Smart Indoor Systems”. Journal of ISMAC 8 (1): 1-14. https://doi.org/10.36548/jismac.2026.1.001.
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Keywords

— Li-Fi
— Visible Light Communication (VLC)
— Optical Wireless Communication
— Arduino Uno
— OOK Modulation
— LDR Receiver
— DHT11 Sensor
— Short-Range Indoor Communication
— Alphanumeric Message Transmission
Published: 06-03-2026

Abstract

Light Fidelity (Li-Fi) is one type of optical wireless communication that transmits data over a short distance using visible light. This proposed method is developed with two Arduino UNO boards, a high-brightness LED as a transmitter and a Light Dependent Resistor (LDR) as a receiver. The real-time temperature is combined with alphanumeric message transmission using a DH11 sensor as a transmitter. The message and the sensor data are displayed on a 16×2 LCD serial monitor. Data is encoded using On-Off Keying (OOK) based intensity modulation with a bit length of 150ms providing accurate decoding at the receiver under indoor illumination conditions. The results confirm effective transmission up to a length of 2cm. The performance decreases due to reduced transmitted optical intensity and ambient light interference. This method is an efficient end-to-end indoor optical connection for short-range sensor communication and educational purposes.

References

  1. Devi, Ganesan, N. Jayanthi, S. Rahul, M. Saran Karthick, S. Gokul Raghavendra, and M. Anand. "A Critical Review on Li-Fi Technology and Its Future Applications." In AIP Conference Proceedings, vol. 2690, no. 1, AIP Publishing LLC, 2023, 020061.
  2. Georlette, Véronique, and Véronique Moeyaert. "Li-Fi and Visible Light Communication for Smart Cities and Industry 4.0: Challenges, Research & Market Status in 2023." In 2023 23rd International Conference on Transparent Optical Networks (ICTON), IEEE, 2023, 1-4.
  3. Subha, T. D., T. D. Subash, N. Elezabeth Rani, and P. Janani. "Li-Fi: A Revolution in Wireless Networking." Materials today: proceedings 24 (2020): 2403-2413.
  4. Jose, Neethu. "Led and Light Detector Matrix for Visible Light Sensing Application." Master's thesis, N. Jose, 2024.
  5. Cui, Kaiyun, Gang Chen, Zhengyuan Xu, and Richard D. Roberts. "Line-of-Sight Visible Light Communication System Design and Demonstration." In 2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010), IEEE, 2010, 621-625.
  6. Perwej, Yusuf. "The Next Generation of Wireless Communication Using Li-Fi (Light Fidelity) Technology." Journal of Computer Networks (JCN) 4, no. 1 (2017): 20-29.
  7. Khare, Yash, Vijay Prakash Tiwari, Akshay B. Patil, and Kumkum Bala. "Li-Fi Technology, Implementations and Applications." Int. Res. J. Eng. Technol 3, no. 4 (2016): 1391-1394.
  8. Sarkar, Anurag, Shalabh Agarwal, and Asoke Nath. "Li-Fi Technology: Data Transmission Through Visible Light." International Journal of Advance Research in Computer Science and Management Studies 3, no. 6 (2015).
  9. Sodhi, Aman, and Jeslin Johnson. "Light Fidelity (LI-FI)-The Future of Visible Light Communication." International Journal of Engineering Research and General Science 3, no. 2 (2015): 117-128.
  10. Cevik, Taner, and Serdar Yilmaz. "An Overview of Visible Light Communication Systems." arXiv preprint arXiv:1512.03568 (2015).
  11. Karthik, V., K. Balashanmugam, S. Abithsingh, S. Akash, and S. Arivumani. "High Speed Transmission of Data or Video Over Visible Light Using Li-Fi." In 2022 International Conference on Advanced Computing Technologies and Applications (ICACTA), IEEE, 2022, 1-6.
  12. Khorov, Evgeny, and Ilya Levitsky. "Current Status and Challenges of Li-Fi: IEEE 802.11 bb." IEEE Communications Standards Magazine 6, no. 2 (2022): 35-41.
  13. Almadani, Yousef, David Plets, Sander Bastiaens, Wout Joseph, Muhammad Ijaz, Zabih Ghassemlooy, and Sujan Rajbhandari. "Visible Light Communications for Industrial Applications—Challenges and Potentials." Electronics 9, no. 12 (2020): 2157.
  14. Haas, Harald, Liang Yin, Yunlu Wang, and Cheng Chen. "What is Lifi?." Journal of lightwave technology 34, no. 6 (2015): 1533-1544.
  15. Karunatilaka, Dilukshan, Fahad Zafar, Vineetha Kalavally, and Rajendran Parthiban. "LED Based Indoor Visible Light Communications: State of the Art." IEEE communications surveys & tutorials 17, no. 3 (2015): 1649-1678.
  16. Begam, J. Nalifa, N. Askarali, Aravindhraj Natarajan, and R. Deepa. "Arduino Based Visible Light Communications Between Two Devices Using Li-Fi Technology." In 2021 International Conference on Advancements in Electrical, Electronics, Communication, Computing and Automation (ICAECA), IEEE, 2021, 1-4.