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2021·Embedded & cloud engineer

IoT Door Unlock

Edge-to-cloud access control system with secure telemetry, fallback flows, and mobile notifications.

Stack

Raspberry Pi,Node.js,MQTT,AWS IoT,React Native

Timeline

2021

Impact

  • Sub-1s unlock latency
  • Offline fallback cache with automatic re-sync
Discuss architecture

Context & Goals

Built an access control proof-of-concept for smart offices. Gateways must securely communicate with the cloud while maintaining local authorizations during outages.

Architecture

  • Edge device: Raspberry Pi running Rust/Node hybrid service managing relay control, keypad input, and local caching.
  • Messaging: MQTT topics with mutual TLS; AWS IoT Core handles device registry, policies, and fleet jobs.
  • Cloud services: Node.js API with DynamoDB storing credential assignments, CloudWatch metrics, and SNS push notifications.
  • Mobile: React Native app for unlock requests, audit log review, and admin actions.

Wins

  • Implemented rolling credential cache with AES encryption and tamper detection.
  • Added OTA update pipeline with staged rollouts and health checks.
  • Observability via Grafana dashboards and alerting on unusual unlock patterns.

Future work

  • Add biometric reader integrations and SOC2 logging bundles.
  • Support multi-site deployments with regional failover.