Getting started with 2-Channel Wi-Fi AC Relay Module In Home Assistant

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Overview

The 2-Channel Wi-Fi AC Relay Module is a smart device from Seeed Studio designed to control AC-powered appliances wirelessly. Its dual-channel configuration supports independent control of two loads, making it an excellent choice for automating household appliances such as lights, fans, and other devices in a Home Assistant environment.

This guide provides a detailed walkthrough, including setup, integration, and advanced configuration for users ranging from beginners to smart-home enthusiasts.

Key Features and Specifications

Feature	Details
Input Voltage	AC 100-240V, 50/60Hz
Output Voltage	AC 100-240V, 50/60Hz
Maximum Load	10A per channel
Channels	2 (independent control for each channel)
Connection Type	Wi-Fi
Input Terminals	N (Neutral), L (Live)
Output Terminals	Channel 1: N1 (Neutral), L1 (Live) Channel 2: N2 (Neutral), L2 (Live)

Safety Warning

Always disconnect AC power before wiring the relay. Avoid using the USB port while the device is connected to AC power to prevent electrical hazards.

Physical Layout and Connections

Input and Output Terminals

• Input
  • N (Neutral): Connect the neutral wire from the AC power supply.
  • L (Live): Connect the live wire from the AC power supply.
• Output
  • Channel 1
    • N1 (Neutral): Neutral wire for the load connected to Relay 1.
    • L1 (Live): Live wire for the load connected to Relay 1.
  • Channel 2
    • N2 (Neutral): Neutral wire for the load connected to Relay 2.
    • L2 (Live): Live wire for the load connected to Relay 2.

Getting Started

Requirements

1. Core Components:
   • 2-Channel Wi-Fi AC Relay Module
   • Home Assistant Green
2. Network:
   • Stable Wi-Fi for seamless interaction between hardware and Home Assistant.

Step 1: Set Up the Relay Module (Physical Setup)

1. Installation: homeassistant is already pre-installed in Home Assistant Green.
2. Enabling ESPHome Add-on:
   • Access the Home Assistant dashboard.
   • Navigate to the "Add-ons" section and search for the ESPHome add-on.
   • Click "Install" and then "Start" to enable it.
   • Once installed, configure the add-on to ensure proper communication with the XIAO ESP32C3.

By gathering the necessary components and setting up Home Assistant with the ESPHome add-on, you'll be ready to proceed with the integration of the 2-Channel Wi-Fi AC Relay Module.

Step 2: Preparing the Relay Module

By default, your device (XIAO ESP32C3) comes pre-flashed with firmware for 2-Channel Wi-Fi AC Relay Module. However, there are two scenarios where you may need to update the firmware:

1. Re-flashing the Firmware: If the existing firmware is corrupted or you need to start fresh.
2. Upgrading the Firmware: If there is a newer version of the firmware with improved functionality.

There are two simple methods for flashing the firmware:

caution

Firefox does not support flashing firmware on ESP devices. Please use Google Chrome or Microsoft Edge instead.

Web Tool

You can use this Web Tool for an easy and direct method to flash your firmware. Simply follow the on-screen instructions.

• Click the CONNECT button to initiate the connection. The tool will automatically update the firmware.

If something goes wrong, follow the on-screen troubleshooting steps or switch to the ESPHome Web method to complete the process.

ESPHome Web

For this method, you'll need to download the bin firmware file from here(you'll need to unzip the downloaded file).

1. Connect the sensor kit to your PC.
2. Visit the ESPHome Web page.
3. Select the firmware file with the *.factory.bin suffix.

Watch the following video for a detailed walkthrough of flashing the firmware via ESPHome Web:

With either method, you'll have your firmware updated and ready for integration with Home Assistant.

Step 3: Network Configuration

1. Enable Access Point:
   • Upon powering up for the first time, the module will create a Wi-Fi network (SSID: seeedstudio-relay).

2. Access Configuration:
   • Connect to the network using a phone or PC.
   • Open a browser and navigate to http://192.168.4.1.
   • Enter the SSID and password of your home Wi-Fi network.

3. Home Assistant Integration:
   • Once connected to the home network, the module will be discoverable in Home Assistant under Settings -> Devices & Services.

This way, you can connect the module to your Home Assistant network and let Home Assistant discover it.

Step 4: Add the module device

1. Automatic Discovery:
   • Ensure the ESPHome is installed in Home Assistant.
   • Navigate to Settings -> Devices & Services -> Integrations and look for the device.
2. Manual Configuration:
   • If not automatically discovered, manually add the device by specifying its IP address.

After adding the device, you can see both switches in the Overview page. You can also set the name of each switch individually.

Safety and Maintenance

1. Periodically inspect wiring for wear and tear.
2. Use proper circuit protection devices, such as fuses or breakers.
3. Keep the device away from water and excessive heat.

FAQs

1. What happens if the device is disconnected from Wi-Fi?
   • The module will attempt to reconnect automatically. If it fails, it will enable its fallback access point for reconfiguration.
2. Can I use the USB port while connected to AC power?
   • No, using USB while connected to AC power may damage the device or create a safety hazard.
3. Can this module work without Home Assistant?
   • Yes, the module can be controlled via its local IP address or integrated with other platforms that support ESPHome or MQTT.

Resources

• GitHub Repository: Access the ESPHome Firmware at the Seeed Studio Dual Channel Relay Module GitHub page.
• Dual Channel Relay Module Schematic: Seeed_Studio_2-Channel_AC_Wi-Fi_Relay_SCH.pdf.

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