1. Introducció
This manual provides comprehensive instructions for the installation, operation, and maintenance of your DieseRC Smart WiFi 2-Channel Relay Module with Bluetooth Transmitter. This device allows for remote control of various electrical appliances via Wi-Fi, Bluetooth, and voice commands through compatible smart home systems.

Image 1.1: The DieseRC Smart WiFi 2-Channel Relay Module and its accompanying Bluetooth remote control.
2. Producte acabatview
The DieseRC Smart WiFi Relay Module is designed for versatile control of electrical devices. It features two independent relays, Wi-Fi connectivity for app control, Bluetooth for remote control, and compatibility with voice assistants.
2.1 Característiques clau
- Connectivitat sense fils: Admet Wi-Fi de 2.4 GHz per al control remot mitjançant l'aplicació eWelink.
- Control Bluetooth: Includes a Bluetooth transmitter for local remote operation.
- Control de veu: Compatible amb Amazon Alexa i Google Home per a un funcionament amb mans lliures.
- Dual Relays: Two independent 10A relays with Normally Open (NO), Common (COM), and Normally Closed (NC) terminals.
- Entrada d'alimentació flexible: Funciona amb 5 V CC o 7 V-48 V CC.
- Disseny compacte: Dimensions of 60x32x17 mm (2.4x1.3x0.7 inches) for easy integration.
- Múltiples modes de funcionament: Configurable as toggle mode or inching mode.
2.2 Identificació de components

Imatge 2.1: Detallada view of the relay module showing terminals and indicators.
- NO (Normally Open) Pin: Contact is open when the relay is de-energized.
- COM (Common) Pin: Common terminal for the relay contact.
- NC (Normally Closed) Pin: Contact is closed when the relay is de-energized.
- Llum indicadora de relé: Illuminates when the corresponding relay is active.
- Open the key / Pairing button: Used for pairing with the eWelink app and Bluetooth remote.
- Llum indicadora de xarxa WiFi: Mostra l'estat de la connexió Wi-Fi.
- Input USB 5V/0.5A: Port micro USB per a entrada d'alimentació de 5 V CC.
- +V / -V Terminals: Screw terminals for DC 7V-48V power input.
3. Especificacions
| Característica | Especificació |
|---|---|
| Número de model | EW748 |
| Marca | DieseRC |
| Dimensions (L x A x A) | 60 x 32 x 17 mm (2.4 x 1.3 x 0.7 polzades) |
| Pes | 118 grams (aprox.) |
| Entrada Voltage | DC 5V (via USB) or DC 7V-48V (via screw terminals) |
| Valoració actual | 10A per relay |
| Tipus de contacte | Normalment obert (NO), comú (COM), normalment tancat (NC) |
| Connectivitat sense fil | Wi-Fi 2.4 GHz, Bluetooth |
| Compatibilitat d'aplicacions | eWelink (Android & iOS) |
| Compatibilitat de l'Assistent de veu | Amazon Alexa, Google Home |
| Modes de funcionament | Toggle Mode, Inching Mode |
| Certificació | CE |
4. Configuració
4.1 Engegada del mòdul
El mòdul es pot alimentar de dues maneres:
- USB 5V: Connect a standard Micro USB cable to the USB port on the module and a 5V/0.5A power adapter.
- DC 7V-48V: Connect the positive (+) and negative (-) wires of your DC power supply to the corresponding +V and -V screw terminals on the module. Ensure correct polarity.

Image 4.1: Powering the module via USB 5V or DC 7V-48V terminals.
4.2 eWelink App Installation and Pairing
- Download the eWelink App: Escaneja el codi QR a continuació o visita'l http://app.coolkit.cc/dl.html to download the eWelink app for your Android or iOS device.
- Registra't/Iniciar sessió: Open the eWelink app and create an account or log in if you already have one.
- Introduïu el mode de vinculació: Power on the DieseRC module. Press and hold the "Open the key / Pairing button" on the module for approximately 5-7 seconds until the Wi-Fi indicator light blinks rapidly.
- Afegeix un dispositiu a l'aplicació: In the eWelink app, tap the "+" icon to add a new device. Follow the on-screen instructions to select "Quick Pairing Mode" or "Compatible Pairing Mode" as needed.
- Connecta't a Wi-Fi: Enter your 2.4GHz Wi-Fi network name (SSID) and password when prompted. The module does not support 5GHz Wi-Fi.
- Maridatge complet: Once connected, the Wi-Fi indicator light on the module will stop blinking and remain solid. The device will appear in your eWelink app.

Image 4.2: QR code for eWelink app download.
4.3 Emparellament remot Bluetooth
The included Bluetooth remote control (RM2.4G) is pre-paired with the module. If re-pairing is necessary:
- Assegureu-vos que el mòdul estigui encès.
- Press and hold the pairing button on the module until the Wi-Fi indicator light blinks.
- Press any button on the Bluetooth remote. The module's indicator light should confirm successful pairing.
5. Instruccions de funcionament
5.1 eWelink App Control
Once paired, you can control the module from anywhere using the eWelink app:
- Open the eWelink app and select your device.
- You will see virtual buttons for each relay (e.g., Channel 1, Channel 2). Tap to toggle the relay on/off.
- The app allows for scheduling, timers, and sharing control with family members.

Image 5.1: Remote control of devices via the eWelink app.
5.2 Control per veu (Alexa/Google Home)
To enable voice control, link your eWelink account with Amazon Alexa or Google Home:
- Obre l'aplicació Alexa o Google Home.
- Navega fins a "Habilitats i jocs" (Alexa) o "Compatible amb Google" (Google Home).
- Cerca "eWelink" and enable the skill/service.
- Link your eWelink account using your credentials.
- Discover devices. Your DieseRC module will appear.
- Ara podeu utilitzar ordres de veu com ara:
- "Alexa, turn on Channel 1."
- "Hey Google, turn off Channel 2."

Image 5.2: Voice control integration with smart home assistants.
5.3 Comandament a distància Bluetooth
Use the included Bluetooth remote for local control:
- Press buttons 1 or 2 to control the respective relays.
- "ALL ON" and "ALL OFF" buttons control both relays simultaneously.
6. Modes de funcionament
The module supports two main operating modes, configurable via the eWelink app:
- Commuta el mode: Each press of the button (app, voice, or remote) will switch the relay state (ON to OFF, or OFF to ON). This is suitable for lights or devices that need to stay on until manually turned off.
- Mode d'avanç lent (momentani): The relay will turn ON for a set duration (e.g., 0.5 seconds) after a button press, then automatically turn OFF. This is ideal for momentary actions like garage door openers or electric locks. The duration can be configured in the eWelink app.

Image 6.1: The module can be configured to act as a momentary switch (push button) or a toggle switch (rocker switch).
7. Esquemes de cablejat
Important: Ensure power is disconnected before performing any wiring. If you are unsure about electrical wiring, consult a qualified electrician.
7.1 Relay Contact Configuration

Image 7.1: Illustration of NO, COM, and NC terminals for each relay.
- NO (Normally Open) to COM: The circuit is open when the relay is off and closes when the relay is on.
- NC (Normally Closed) to COM: The circuit is closed when the relay is off and opens when the relay is on.
Ex. 7.2ample Wiring Scenarios

Image 7.2: Various wiring configurations for different applications.
- DC Device (DC 7V-48V): Connect the DC power supply to the module's +V and -V terminals. Connect the device's power input to the relay's COM and NO terminals.
- AC Device (1V-250V): Power the module via USB 5V. Connect the AC power source to the device and route one of the AC lines through the relay's COM and NO terminals.
- DC Motor (DC 7V-48V): For controlling a DC motor, two relays can be used for forward/reverse or on/off control, depending on the motor type and desired functionality.
- Garage Door/Curtain Motor: The module can be integrated into existing control circuits for garage doors or curtain motors, typically using the inching mode to simulate a momentary button press.
For specific applications, refer to the device's wiring requirements and ensure compatibility with the relay's specifications (10A, 250VAC/30VDC).
8. Manteniment
- Mantingueu el mòdul en un lloc sec, allunyat de la humitat i de temperatures extremes.
- No exposeu el mòdul a la llum solar directa ni a substàncies corrosives.
- Comproveu regularment la seguretat de les connexions del cablejat.
- Ensure the power supply matches the module's specifications.
- Periodically check for eWelink app updates to ensure optimal performance and security.
9. Solució De Problemes
- Module not powering on:
- Check power connections (USB 5V or DC 7V-48V).
- Ensure the power adapter provides sufficient voltage and current (at least 0.5A).
- No es pot connectar a Wi-Fi:
- Ensure your Wi-Fi network is 2.4GHz. The module does not support 5GHz.
- Verifiqueu que la contrasenya del Wi-Fi sigui correcta.
- Place the module closer to your Wi-Fi router during pairing.
- Reset the module by holding the pairing button until the Wi-Fi indicator blinks rapidly, then try pairing again.
- El control de l'aplicació no funciona:
- Comproveu la vostra connexió a Internet.
- Ensure the module's Wi-Fi indicator is solid, indicating a stable connection.
- Reinicieu l'aplicació eWelink.
- El control per veu no respon:
- Verify that your eWelink account is correctly linked to Alexa/Google Home.
- Ensure the device is discovered in your Alexa/Google Home app.
- Comproveu la precisió de les ordres de veu.
- Bluetooth remote not working:
- Ensure the remote has working batteries.
- Re-pair the remote with the module as described in Section 4.3.
10. Garantia i Suport
For warranty information and technical support, please refer to the product packaging or contact DieseRC customer service through the retailer where the product was purchased. You can also visit the official DieseRC weblloc per obtenir més ajuda.





