1. Product Overview
The QIACHIP KR0548-4CH is a WiFi smart switch four-channel relay module designed for home automation. It enables users to remotely control connected appliances or devices through the eWelink APP. This module supports third-party voice control via platforms like Amazon Alexa and Google Home, and can also be controlled using a 2.4G smart remote. Key functionalities include timer on/off, scene linkage, power-on status setting, inching mode, interlock mode, and sharing control.
Image 1.1: QIACHIP WiFi Smart Switch Module for various applications.
The module operates with a low voltage dry contact relay/passive output. It can be powered via USB 5V or DC 7-48V positive and negative input. The board's power consumption is less than 1W, with a quiescent current of 80mA. It features 10A relays with a life expectancy exceeding 1,000,000 cycles, and an electrical insulation resistance of 100M with a withstand voltage of 1000V.
2. Specifications
| Feature | Specification |
|---|---|
| Model | KR0548-4CH |
| Input Voltage | USB 5V / DC 7-48V |
| Output Type | Dry Contact / Passive Output |
| Number of Channels | 4 |
| Rated Switching Current | Within 10A |
| Switching Voltage | Within 250V |
| Relay Life | Over 1,000,000 times |
| Electrical Insulation Resistance | 100M |
| Electric Shock Withstand Voltage | 1000V |
| Max. Relay Pull-in Time | 15ms |
| Max. Relay Release Time | 5ms |
| Operating Temperature | -40°C to +70°C |
| Operating Humidity | 40% ~ 80%RH |
| Wireless Connectivity | 2.4G WiFi (5G WiFi not supported) |
| Dimensions | 70.5mm (L) x 27.4mm (W) x 23mm (H) |
Image 2.1: Detailed view of the KR0548-4CH module components and connections.
3. Setup and Installation
3.1 Powering the Module
The module can be powered using either a USB 5V input or a DC 7-48V input. Ensure the power supply matches the module's requirements. The new version features a USB-C port for 5V power input.
Image 3.1: The module with its USB-C power input.
3.2 eWelink APP Pairing
To pair the module with the eWelink APP:
- Connect the module to a USB power source.
- Press and hold the pairing button on the module for approximately five seconds until the indicator light flashes, indicating pairing mode.
- Open the eWelink APP on your smartphone.
- Navigate to 'Add Device' and select 'Bluetooth Wiring' or 'Quick Pairing'.
- The app will scan for nearby devices. Once the module is detected, confirm the pairing.
- Select your 2.4G WiFi network and enter the password. Note: 5G WiFi networks are not supported.
- Wait for the app to complete the pairing process. Once successful, the device will appear in your eWelink device list.
Video 3.1: Tutorial on connecting the WiFi relay module to the eWelink APP.
This video demonstrates the step-by-step process of powering the QIACHIP KR0548-4CH module via USB, initiating the pairing sequence by holding the button for five seconds, and then completing the device addition and WiFi configuration within the eWelink application on a smartphone. It shows how to select the 2.4G WiFi network and confirms successful device pairing, allowing for remote control via the app.
3.3 Wiring Diagrams
The product features dry contact passive output. Users need to provide an additional power supply for the load as required. Below are examples of common wiring configurations:
Image 3.2: Example wiring for controlling lights with the module.
Image 3.3: Example wiring for controlling DC motors with the module.
Image 3.4: General input and output connections for various devices like garage doors, computers, and appliances.
4. Operating Modes
The module supports three primary working modes, configurable within the eWelink APP:
- Self-locking Mode (Default): In this mode, each channel operates independently. Pressing the button once turns the relay ON, and pressing it again turns it OFF.
- Inching Mode: When activated, the relay will turn ON for a set duration (e.g., 0.5 seconds) after the button is pressed, then automatically turn OFF. This is useful for momentary actions like opening a garage door.
- Interlock Mode: In this mode, only one channel can be ON at a time. If one channel is activated, any other active channel will automatically turn OFF. This is suitable for applications where only one operation should occur at a time.
5. Remote Control and App Usage
5.1 eWelink APP Control
Once paired, you can control the module from anywhere using the eWelink APP. The app provides individual control for each of the four channels, as well as options for 'All ON' and 'All OFF'.
Image 5.1: Remote control of devices via the eWelink app.
5.2 2.4G Remote Control
A 2.4G smart remote control can be added to the eWelink APP for local control. This remote typically features 'All ON' and 'All OFF' buttons, allowing convenient control of multiple devices simultaneously. The remote control distance can be up to 30 meters.
Image 5.2: Using the 2.4G remote control for 'All ON' and 'All OFF' functions.
5.3 Timing and Cycle Functions
The eWelink APP allows you to set up timing schedules and cycle timers for your connected devices. This enables automated control, such as turning lights on or off at specific times or repeating actions daily.
Image 5.3: Setting up timing and cycle functions within the eWelink app.
6. Voice Control Integration
The QIACHIP KR0548-4CH module is compatible with popular voice assistants, including Amazon Alexa, Google Assistant, and IFTTT. To enable voice control:
- Ensure your eWelink account is linked to your Amazon Alexa or Google Home account.
- Sync your devices within the respective voice assistant app.
- You can then use voice commands to control your connected devices (e.g., "Alexa, turn on the light").
Image 6.1: Demonstrating voice control capabilities with Amazon Alexa and Google Home.
7. Maintenance
To ensure optimal performance and longevity of your QIACHIP KR0548-4CH module:
- Keep the module in a dry environment, away from moisture and extreme temperatures.
- Avoid exposing the module to direct sunlight or corrosive substances.
- Regularly check wiring connections to ensure they are secure.
- Ensure the power supply is stable and within the specified voltage range (USB 5V or DC 7-48V).
- Periodically check for eWelink APP updates to benefit from new features and stability improvements.
8. Troubleshooting
- Device not pairing: Ensure the module is powered correctly and the indicator light is flashing. Verify your smartphone is connected to a 2.4G WiFi network (5G is not supported). Keep the phone close to the module during pairing.
- Remote control not working: Check if the 2.4G remote control has been successfully added and paired within the eWelink APP. Ensure the remote is within the effective range (up to 30m).
- Voice control issues: Confirm that your eWelink account is correctly linked to your Alexa or Google Home account and that devices are synced. Check your internet connection.
- Relay not switching: Verify the wiring connections to the load are correct and secure. Ensure the load's power requirements do not exceed the module's 10A/250V rating.
- Intermittent connectivity: Ensure the module is within good range of your 2.4G WiFi router. Avoid placing the module near large metal objects that could obstruct the WiFi signal.
9. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your purchase or contact QIACHIP customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.
