Ranjeet Kumar, D Vijendar, T Sai Manoj, K Ramana Reddy

DOI: https://doi.org/10.5281/zenodo.23211848

Conventional educational projectors generally depend on external computers, wired power sources, and additional presentation software, which limits portability and increases setup complexity in laboratories and resource-constrained teaching environments. This work presents a portable smart projector based on the Raspberry Pi 3B+ single-board computer, designed to provide standalone educational multimedia projection without continuous dependence on an external computer. The proposed system integrates local storage, a mini light-emitting diode projection module, rechargeable battery power, a Battery Management System (BMS), wireless connectivity, and a lightweight software environment for handling presentations, documents, images, and videos. Raspberry Pi operating system, Python-based control software, Video LAN Client multimedia playback, LibreOffice, and a graphical user interface were used for system implementation and testing. The prototype was evaluated through practical classroom and laboratory sessions using battery performance, thermal behavior, rendering efficiency, and playback frame rate as performance indicators. The system achieved a rendering efficiency of 0.939 and a playback rate of 23.44 frames per second, with a reported thermal dissipation value of 45.22°C. During operation, processor temperature remained approximately within 55–60°C, while battery voltage decreased from approximately 12.6 V to 10.5 V before battery management cutoff. The system also demonstrated more than two hours of operating runtime. The results demonstrate that the proposed projector can provide a compact, battery-powered, and practical alternative for portable digital education, engineering laboratories, workshops, and field-based teaching.

Battery Management System; embedded system; educational technology; portable projector; Raspberry Pi; multimedia rendering.

The proposed Portable Raspberry Pi Based Smart Projector integrates embedded multimedia processing, battery-powered operation, power management, and optical projection into a single standalone educational platform. The strongest experimental result was a 23.44 frames-per-second playback rate with 0.939 rendering efficiency, while maintaining a processor temperature of approximately 55–60 °C during operation, demonstrating stable multimedia performance for portable educational use.

P. Srividya Devi, U. Vijaya Lakshmi, M. Rekha, and P. Sirisha, “Implementation of low cost classroom education using the Smart Pi Zero,” Turkish Journal of Computer and Mathematics Education, vol. 12, no. 10, pp. 6073–6077, Apr. 2021, doi: 10.17762/turcomat.v12i10.5432.
[2] V. Shangamesh M. A., K. V. Anusuya, and V. Adithya, “Portable and projectable mini PC,” in Proc. First International Conference on Combinatorial and Optimization (ICCAP), Chennai, India, Dec. 2021, doi: 10.4108/eai.7-12-2021.2314725.
[3] R. Zárate-Moedano, S. L. Canchola-Magdaleno, and A. A. Arrington-Báez, “Remote laboratory, based on Raspberry Pi, to facilitate scientific experimentation for secondary school students,” International Journal of Online and Biomedical Engineering, vol. 17, no. 14, pp. 154–163, Dec. 2021, doi: 10.3991/ijoe.v17i14.25525.
[4] F. F. Paulo, P. F. Oliveira, and P. Matos, “A low-cost solution to improve video projector management and connectivity using virtualization,” in Proc. 5th International Electronic Conference on Applied Sciences, Dec. 2024.
[5] C. Liu, Y. Zheng, F. Chu, Y.-W. Zheng, and Q.-H. Wang, “Adaptive micro-projection system based on liquid lens,” Optics and Laser Technology, vol. 167, Art. no. 109734, Dec. 2023, doi: 10.1016/j.optlastec.2023.109734.

Ranjeet Kumar, D Vijendar, T Sai Manoj, K Ramana Reddy (2026). Portable Raspberry Pi Based Smart Projector. International Journal of Engineering and Techniques, 12(5), 343–349. ISSN: 2395-1303. DOI: https://doi.org/10.5281/zenodo.23211848