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2-Channel Wi-Fi AC Relay Module In Home Assistant

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​

FeatureDetails
Input VoltageAC 100-240V, 50/60Hz
Output VoltageAC 100-240V, 50/60Hz
Maximum Load10A per channel
Channels2 (independent control for each channel)
Connection TypeWi-Fi
Input TerminalsN (Neutral), L (Live)
Output TerminalsChannel 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.

Physical Representation​

+-----------------------------------------+
| Seeed Studio 2-Channel AC Wi-Fi Relay   |
|-----------------------------------------|
| Input:                                  |
|   N  (Neutral)                          |
|   L  (Live)                             |
| Output: Channel 1                       |
|   N1 (Neutral for Load 1)               |
|   L1 (Live for Load 1)                  |
| Output: Channel 2                       |
|   N2 (Neutral for Load 2)               |
|   L2 (Live for Load 2)                  |
+-----------------------------------------+

Getting Started​

Requirements​

  1. Core Components:
    • 2-Channel Wi-Fi AC Relay Module
  2. Software:
    • Home Assistant installed
    • ESPHome Add-On set up for device communication(if not then the device will not be discovered)
  3. Network:
    • Stable Wi-Fi for seamless interaction between hardware and Home Assistant.

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

  1. Wiring:
    • Follow the Physical Layout and Connections section to wire the relay module.
    • Ensure all connections are secure, and there are no exposed wires.
  2. Power On:
    • Turn on the AC supply. Do not power on the module through USB if it is connected to AC power.

Step 2: 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 3: 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.

Automation and Use Cases​

  1. Basic Automation:
    • Create a time-based schedule to toggle the relay at specific times.
  2. Sensor Integration:
    • Combine the relay with a temperature or motion sensor for conditional control (e.g., turn on a fan when the temperature exceeds a threshold).
  3. Notifications:
    • Set up Home Assistant to send notifications when the relay state changes or if the device goes offline.

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.

Tech Support & Product Discussion​

Thank you for choosing our products! We are here to provide you with different support to ensure that your experience with our products is as smooth as possible. We offer several communication channels to cater to different preferences and needs.

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