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Wiring Guide

Before you start​

⚠️ Disconnect mains power before working on high-voltage wiring. Consult a licensed electrician for AC loads.

Wiring steps​

1. Power the ESP32​

  • Connect 5V and GND from a stable supply (2A+ recommended with 16 relays).

2. Connect the relay board​

  • Wire GPIO lines per the pinout.
  • Share GND between ESP32 and the relay board.

3. Loads (lighting example)​

Phase (L) ──► Lamp ──► Relay COM/NO ──► Neutral (N)

Use NO (Normally Open) so the load energizes when the relay is ON.

4. Earthing​

  • Follow your local electrical code at the distribution panel.
  • Do not tie Neutral to protective Earth on the relay board.

Post-wiring test​

  1. Flash firmware with no AC loads connected.
  2. Test one channel with a low-voltage lamp or LED indicator.
  3. Connect real loads gradually.