This paper presents the design and implementation of an Automatic Feeding and Rabies Detection System for stray dogs using IoT. The system integrates an IR sensor (HC-SR501) for detecting dog presence, a VOC sensor (MQ-135) for identifying health abnormalities through volatile organic compound analysis, a servo motor for automated food dispensing, an ESP32-CAM for real-time image capture, and a GSM module (SIM800L) for Telegram-based health alerts. The system autonomously feeds healthy animals while sending alerts when abnormal VOC levels are detected, supporting stray animal welfare with minimal human intervention. Test results confirm accurate dog detection, reliable food dispensing, and successful alert transmission.

The Automatic Feeding and Rabies Detection System was successfully implemented on Arduino using an IR sensor (pin A2), MQ-135 gas sensor (pin A5), SG90 servo motor (pin 12), 16×2 LCD (pins 2-7), passive buzzer (pin 13), and SIM800L GSM module (SoftwareSerial pins 10-11). The program runs on a 300 ms polling loop with boolean flags (gasAlertSent, objectDetected) to prevent repeated triggering. All four test scenarios produced correct LCD output, servo response, buzzer alerts, and GSM SMS delivery as verified during prototype testing. The one-shot flag mechanism ensures that the SMS is sent only once per gas event, preventing network flooding. Future work will incorporate an ESP32- CAM for image capture, GPS tracking, cloud-based health logging, and solar power for field deployment.

[1]Azhar, Wan Muhammad Sufyan Wan, et al., “Design of an IoT-Based Pet Feeder,” 2025. [2]Vedhashree, S. K., Menakadevi Nanjundan, and G. P. Evangeline Persis, “IoT-Based Smart Automatic Pet Feeder with Remote Monitoring,” 2025. [3] Sujatha, V., et al., “Automation in Pet Care: An IoT Approach to Smart Pet Feeding Systems,” 2024. [4]Abisha, D., et al., “Enhancing Pet Care with IoT: The Development of a Smart Pet Feeder,” 2024. [5]Zulkiflee, R. A. B., Qi Wei Oung, and Hoi Leong Lee, “IoT-Enabled Automated Pet Feeding System,” in 2024 IEEE 1st International Conference on Communication Engineering and Emerging Technologies (ICoCET), 2024, doi: 10.1109/ICOCET63343.2024.10730695.

© 2025 International Journal of Engineering and Techniques (IJET).

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