HomeSync — IoT Home Security Monitor
Smart home security system spanning STM32 sensors, an ESP32-S3 MQTT bridge, a Node.js/Prisma backend, and a Next.js real-time dashboard with live alerts.
About this project
Built for Chulalongkorn's Embedded System Lab, HomeSync needed to turn raw sensor readings into a live web dashboard with near-zero latency. An STM32 NUCLEO-F411RE reads ultrasonic, infrared, and vibration sensors and serializes {distance, tilt, accident} over HUART6 to an ESP32-S3, which publishes the payload to NETPIE's MQTT broker. A Node.js/Express service subscribes to the broker, runs threshold-based alert logic, and persists every event to Postgres (Neon) via Prisma; the Next.js 14 frontend polls three REST endpoints every ~2 seconds to keep the SensorDashboard, Recharts time-series charts, and AlertPanel live. The most deliberate architectural decision was splitting firmware across two MCUs — STM32 owns all sensor I/O while ESP32-S3 owns Wi-Fi and MQTT, so each layer can be changed or upgraded independently.
- STM32 NUCLEO-F411RE serialises sensor data over HUART6 to ESP32-S3
- NETPIE MQTT broker decouples hardware from backend — backend subscribes, not polls
- Prisma + Postgres (Neon) persists SensorEvent + alerts tables with type/severity
- Next.js frontend polls /api/sensor, /api/sensor/history, /api/alerts every ~2 s
Key features
3 sensors
Ultrasonic / infrared / vibration
MQTT bridge
ESP32-S3 → NETPIE broker
Alert engine
Threshold rules + DB persistence
Live dashboard
Next.js + Recharts, ~2 s refresh
Tech stack
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