Environmental Monitor

Needed a way to collect, store, and visualize environmental sensor data in real time from multiple distributed sensors without missing readings or losing data under intermittent connectivity.

Built a Node.js service that subscribes to an MQTT broker to receive sensor telemetry, stores time-series data in MongoDB, and exposes a dashboard for real-time visualization. Deployed and managed on a Linux server via SSH.

Node.js subscriber listening to MQTT topics, writing to MongoDB collections. A web-based dashboard reads from the DB and shows real-time charts. Deployed on a Linux VPS managed remotely via SSH.

Key Challenges

• Handling MQTT reconnection logic to avoid data loss during network drops
• Designing a MongoDB schema efficient for time-series sensor queries
• Deploying and managing the service via SSH on a headless Linux server