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Hardware Overview

The default Homatic stack:

ComponentDescription
ESP32WiFi microcontroller + MQTT client
16-channel relay board16 × ~10A switching channels (lights, fans, etc.)
5V power supplyPowers ESP32 and relay board
MosquittoMQTT 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

Detailed guides