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16-Channel Relay Board

Typical specifications​

  • Channels: 16
  • Current: up to 10A per channel (AC 250V — check your board datasheet)
  • Isolation: Optocoupler between ESP32 and relay coils
  • Control logic: Active LOW or HIGH depending on the board

Homatic mapping​

Each relay channel maps to one device in the dashboard:

  • relay_number from 1 to 16
  • esp32_name identifies which ESP32 board (for example sala)
Dashboard Device          MQTT (example)
─────────────────         ─────────────────────────────
relay_number: 3    →    smarthome/sala/relay/3
esp32_name: sala

Maintenance​

  • Do not exceed the rated load per channel.
  • Use appropriate circuit breakers for heavy loads (HVAC, heaters).
  • Provide adequate ventilation around the board.