1. Introducció
This manual provides comprehensive instructions for the installation, setup, and operation of the MHCOZY 1-Channel WiFi Smart Switch Relay Module (Model ew124). This device enables remote control of electrical appliances via the eWeLink app, and integrates with voice assistants like Amazon Alexa and Google Assistant. It supports both inching and self-locking modes, making it suitable for various home automation applications, including garage door control and lighting.

Figura 1.1: MHCOZY 1-Channel WiFi Smart Switch Relay Module.
2. Informació de seguretat
- Desconnexió d'alimentació: Always disconnect power to the circuit before installing or performing any maintenance on the device. Failure to do so may result in electric shock or damage to the device.
- Voltage Compatibilitat: Assegureu-vos que la font d'alimentació voltage (DC 5-32V) and appliance voltage are within the specified limits for the module and relay.
- Valoració actual: Do not exceed the maximum current rating of 10A for the relay. Overloading can cause damage or fire.
- Instal·lació professional: If you are unsure about wiring or electrical connections, consult a qualified electrician.
- Ús interior: This device is designed for indoor use. If used outdoors, it must be housed in a waterproof enclosure.
3. Producte acabatview
The MHCOZY WiFi Smart Switch Relay Module is a compact device designed to add smart control capabilities to existing electrical systems. It features a single relay channel with clean contact passive output, meaning it provides a dry contact closure without output voltage.

Figura 3.1: MHCOZY 1-Channel WiFi Smart Switch Relay Module and its internal components, alongside eWeLink app and voice assistant devices.
3.1. Components i connexions

Figura 3.2: Detallada view of the module board, highlighting key components and connection points.
- Power Supply 1 (USB 5V): Micro USB port for 5V DC power input.
- Power Supply 2 (AC/DC 7-32V): Screw terminals for 7-32V AC/DC power input.
- Relay Output (NO, COM, NC): Dry contact terminals for controlling external devices.
- NO (normalment obert): Contact is open when the relay is off, closed when on.
- COM (Comú): Common terminal for the relay.
- NC (normalment tancat): Contact is closed when the relay is off, open when on.
- Botó manual: Physical button for local control.
- Botó de configuració: Used for pairing the device with the eWeLink app.
- Mòdul WiFi: Integrated module for 2.4GHz WiFi and Bluetooth connectivity.
- 10A Relay: The switching component with a maximum current rating of 10 Amperes.
4. Especificacions
| Característica | Especificació |
|---|---|
| Model | ew124 (1CH WIFI Bluetooth) |
| Entrada Voltage | DC 5V (USB) or AC/DC 7-32V |
| Tipus de relé | Clean Contact Passive Output |
| Màx. Actual | 10A |
| Connectivitat | 2.4GHz WiFi (802.11 b/g/n), Bluetooth |
| Modes de funcionament | Inching (Momentary), Self-locking (Toggle) |
| Temperatura de funcionament | Fins a 70°C |
| Dimensions | 2.68 x 1.57 x 0.67 polzades (aprox. 68 x 40 x 17 mm) |
| Pes | 1.76 unces (aprox. 50 g) |
| Certificacions | CE, RoHS |

Figura 4.1: Approximate dimensions of the MHCOZY 1-Channel WiFi Smart Switch Relay Module.
5. Configuració
5.1. eWeLink App Download
The MHCOZY Smart Switch requires the eWeLink app for configuration and remote control.
- For Android devices, download the "E-WeLink.apk" directly or search "eWeLink" in the Google Play Store.
- For iOS devices, search "eWeLink" in the Apple App Store.
- Alternatively, you can visit the official download page: http://app.coolkit.cc/dl.html
5.2. Instruccions de cablejat
The module requires a power supply and connections to the appliance you wish to control. Ensure all power is disconnected before wiring.
5.2.1. Alimentació del mòdul
The module can be powered by either a 5V USB source or an AC/DC 7-32V source. Choose one method.
- USB 5V: Connect a standard Micro USB cable to the USB port on the module and to a 5V USB power adapter.
- AC/DC 7-32V: Connect the power source to the "Input AC/DC 7-32V" screw terminals. Observe polarity if using DC.

Figura 5.1: Power supply options for the module (USB 5V or AC/DC 7-32V) and basic appliance connection.
5.2.2. Connecting to an Appliance (Dry Contact)
The relay provides a dry contact output, meaning it acts like a switch without supplying voltage. You will connect the appliance's control circuit to the NO (Normally Open) and COM (Common) terminals for most applications.

Figura 5.2: Example wiring for controlling an appliance (e.g., light) using the relay's dry contact output, emphasizing separate power sources.
For applications like garage door openers or access control buttons, connect the module's NO and COM terminals in parallel with the existing push button.

Figura 5.3: Example wiring for integrating the module with an access control button or garage door opener.
Important: The power supply for the module (5-32V) is separate from the power supply for the appliance being controlled by the relay. The relay output (NO, COM, NC) does not provide voltage.
5.3. Pairing with eWeLink App
To control the module via the eWeLink app, you need to pair it with your Wi-Fi network.
- Prepare for Pairing:
- Assegureu-vos que el vostre telèfon intel·ligent estigui connectat a un Xarxa Wi-Fi de 2.4 GHz. If your router has dual bands with the same SSID, temporarily disable the 5GHz band or ensure your phone is explicitly connected to 2.4GHz.
- Activa Bluetooth i Serveis de localització al teu telèfon intel·ligent.
- Power on the MHCOZY module. It will automatically enter Quick Pairing Mode, indicated by the LED flashing two short blinks followed by one long blink.
- Obriu l'aplicació eWeLink: Launch the eWeLink app on your smartphone.
- Afegeix un dispositiu: Tap the "+" icon or "Add Device" option in the app.
- Seleccioneu el mètode d'emparellament: Choose "Bluetooth Pairing" for the easiest setup.
- Initiate Pairing on Module: If the module is not already in pairing mode, press and hold the "Configure" button on the module for 5 seconds until the LED indicator flashes as described above (two short, one long).
- Escaneja dispositius: The app will scan for nearby Bluetooth devices. Select your MHCOZY module from the list and tap "Connect".
- Configuració completa: Follow the on-screen prompts to connect the device to your 2.4GHz WiFi network and name it.
- Compatible Mode (If Quick Pairing Fails): If Bluetooth pairing fails, long-press the "Configure" button again until the LED flashes quickly and continuously. Then, select "Compatible Mode" in the eWeLink app and follow the instructions.

Figura 5.4: Visual guide for pairing the device with the eWeLink app.
6. Modes de funcionament
The MHCOZY module supports two primary operating modes, configurable within the eWeLink app:
6.1. Inching (Momentary) Mode
- In this mode, the relay will turn ON for a set duration (e.g., 0.5 seconds to 1 hour) after being triggered, and then automatically turn OFF.
- This mode is ideal for applications requiring a brief contact closure, such as activating a garage door opener, a momentary push button, or a computer power button.
- The inching time can be adjusted in the eWeLink app.
6.2. Self-locking (Toggle) Mode
- In this mode, the relay acts like a standard ON/OFF switch. One command turns it ON, and another command turns it OFF.
- This mode is suitable for controlling lights, fans, or other appliances that require continuous power until manually switched off.
You can switch between these modes and adjust settings within the eWeLink app for each channel.
7. Integració del control per veu
The MHCOZY module is compatible with popular voice assistants, allowing for convenient hands-free control.
7.1. Amazon Alexa
- Obriu l'aplicació Amazon Alexa.
- Go to "Skills & Games".
- Cerca "eWeLink Smart Home Fan" skill.
- Enable the skill and link your eWeLink account.
- Discover devices. You can now use voice commands like "Alexa, turn on [Device Name]".
7.2. Google Assistant
- Obriu l'aplicació Google Home.
- Tap "Add" (+) > "Set up device" > "Works with Google".
- Cerca "Smart We Link".
- Link your eWeLink account.
- You can now use voice commands like "Hey Google, turn off [Device Name]".
7.3. Apple Siri
You can integrate control with Siri by creating custom shortcuts within the eWeLink app. Refer to the eWeLink app's documentation for detailed instructions on creating Siri Shortcuts.
8. Manteniment
- Neteja: Use a dry, soft cloth to clean the device. Do not use harsh chemicals or abrasive cleaners.
- Actualitzacions de firmware: Consulteu periòdicament l'aplicació eWeLink per veure si hi ha actualitzacions de firmware disponibles per garantir un rendiment i una seguretat òptims.
- Condicions ambientals: Eviteu exposar el dispositiu a temperatures extremes, humitat elevada o llum solar directa.
9. Solució De Problemes
| Problema | Possible causa/solució |
|---|---|
| El dispositiu no es pot connectar a la Wi-Fi. |
|
| El dispositiu està fora de línia a l'aplicació. |
|
| Relay does not activate the appliance. |
|
| El control per veu no funciona. |
|
10. Garantia i Suport
10.1. Informació de la garantia
Specific warranty details for the MHCOZY WiFi Smart Switch Relay Module are typically provided at the point of purchase or by the seller. Please refer to your purchase documentation or contact the retailer for warranty terms and conditions.
10.2. Suport tècnic
For technical assistance or inquiries regarding your MHCOZY product, please contact customer support:
- Correu electrònic: MHCOZY@outlook.com
- Fabricant: Mic Technology Co., Ltd.

Figura 10.1: Product label showing manufacturer and contact details.


