BioDigit

BioDigit is a low-cost IoT-based biodigester monitoring solution designed in Burkina Faso to improve the supervision of small-scale anaerobic digestion systems, particularly in resource-constrained environments. The prototype integrates four sensors (DHT22, BMP280, MQ-4 and HC-SR04) connected to an ESP8266 NodeMCU. Measurements are transmitted via Wi-Fi to Supabase, using PostgreSQL and Realtime services, and displayed through a Flutter mobile application. The application provides real-time monitoring, historical data visualization, device status and threshold-based anomaly alerts. During a seven-day controlled laboratory evaluation, the prototype collected approximately 20,160 measurement points at 30-second intervals. It achieved approximately 98% successful data transmission, a 2.3-second average response time, and detected 19 out of 20 controlled anomaly scenarios (95%). BioDigit is currently an electronic and software prototype. It has not yet been connected to or validated on an operational biodigester. Its objective is to provide an accessible foundation for smarter biodigester supervision across Africa.