Hardware Overview
The default Homatic stack:
| Component | Description |
|---|---|
| ESP32 | WiFi microcontroller + MQTT client |
| 16-channel relay board | 16 × ~10A switching channels (lights, fans, etc.) |
| 5V power supply | Powers ESP32 and relay board |
| Mosquitto | MQTT broker (cloud or on-prem) |
Simplified connection diagram
[ Router WiFi ]
│
├── ESP32 (sala) ──► Relay Board ──► Home loads
└── Mosquitto Broker (e.g. mqtt.homatic.io)
Requirements
- USB cable for initial flashing
- 2.4 GHz WiFi network (ESP32 does not use 5 GHz)
- MQTT broker hostname or IP reachable from the ESP32