<![CDATA[This study presents the development of an Internet of Things based monitoring system and methane energy forecasting for biogas production from tofu wastewater in Somber, Balikpapan. A 1000 L anaerobic biodigester was installed at a home scale tofu industry to process liquid tofu waste through anaerobic fermentation. The monitoring system utilized three ESP32 microcontrollers integrated with MQ-4 methane sensors, DHT11 temperature–humidity sensors, BMP180 pressure sensors, and ultrasonic level sensors. Data were transmitted every 8–10 seconds to Google Spreadsheet via Wi-Fi for real time monitoring. Observations were conducted over a 21-day fermentation period. The results show that methane concentration increased from approximately 4,720–4,810 ppm on day 13 to 5,000–5,050 ppm on day 21. Humidity remained relatively stable between 93.6% and 94.2%, while temperature ranged from 31.5°C to 42.6°C. The average methane quantity was estimated at 1.42 × 10⁷ mol, corresponding to a theoretical energy potential of approximately 3.17 × 10⁶ kWh. These results indicate strong potential for small scale biogas based power generation.]]>
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