ESP32 Smart Home Automation Platform — Multi-Zone Control with Flutter App
A complete ESP32-based smart home ecosystem for a 500-unit residential development — multi-zone HVAC, lighting, access control, and energy monitoring — with sub-100ms control and 34% average energy savings.
⚠The Problem
A residential developer delivering 500 luxury apartments needed a scalable smart home system that could be managed centrally for the building, yet give each resident full control of their own unit. Existing off-the-shelf systems didn't allow white-labeling, had cloud dependency failures, and couldn't provide the building manager with energy analytics per unit. Security was a critical requirement — shared credentials or cloud breaches could compromise all units.
💡Our Solution
We built an ESP32-based zone controller for each apartment (HVAC zones, lighting, door lock) with per-device X.509 certificates and mTLS to AWS IoT Core. Device Shadows provide reliable state sync even when devices go offline. A Lambda automation engine processes scene triggers (e.g., "leave home" scene: lock door, lower HVAC, turn off lights). Each resident controls their unit via a Flutter app; the building manager sees energy dashboards and can remotely manage common areas. Alexa integration allows voice control via a published Smart Home Skill.
🔗System Architecture
ESP32 Controllers (mTLS) → AWS IoT Core + Shadows → Lambda (scenes) → Flutter App + Alexa Skill + Web DashboardTech Stack
- ESP32 (per-zone controllers)
- Solid-state relay boards
- Smart thermostat module
- PIR occupancy sensors
- Smart door lock (RFID + BLE)
- Energy monitoring (PZEM-004T)
- MQTT over TLS (device to AWS IoT Core)
- mTLS device authentication
- BLE (local device pairing)
- Alexa Smart Home Skill API
- AWS IoT Core + Device Shadow
- Lambda (scene automation)
- InfluxDB (energy analytics)
- DynamoDB (device registry)
- Flutter app (iOS + Android)
- Alexa voice integration
- Web dashboard for building manager
Key Features
Results Delivered
- 34% average energy savings from smart HVAC scheduling
- Sub-100ms control response time across 500 units
- Zero security incidents — mTLS + least-privilege policies
- 500 units deployed — all running production firmware v2+
- Alexa integration increased resident satisfaction scores by 28%
Technologies
Who This Is For
Residential developers, luxury home builders, hotel chains, smart building operators
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