SONOFF SV 5–24V DC WiFi Smart Switch Module
The SONOFF SV (Safe Voltage) is a low-voltage WiFi smart switch module designed for remote control of electrical devices and DIY automation projects.
Operating on a 5–24V DC power supply, this compact module allows users to remotely switch connected devices ON/OFF through the eWeLink mobile app.
The SONOFF SV features an onboard relay, WiFi connectivity, and GPIO connections for custom development projects. Its open PCB design makes it suitable for electronics enthusiasts, makers, and smart home automation applications.
Note: This version does not include a protective enclosure or 433MHz RF remote control functionality.
Key Features
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WiFi Remote Control: Switch connected devices ON/OFF using the eWeLink app.
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Low-Voltage Operation: Supports 5–24V DC power input.
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Onboard Relay: Provides switching control for compatible electrical loads.
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Smart Scheduling: Configure timers and automatic ON/OFF operations.
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Mobile App Support: Compatible with Android and iOS through eWeLink.
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Device Status Monitoring: View the relay's current switching status.
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GPIO Expansion: Reserved GPIO connections for secondary development.
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DIY-Friendly Design: Open PCB suitable for custom automation projects.
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Compact Module: Easy to integrate into suitable electronic enclosures.
Technical Specifications
| Parameter |
Specification |
| Brand |
SONOFF |
| Model |
SONOFF SV |
| Product Type |
WiFi Smart Relay Switch Module |
| Input Voltage |
5–24V DC |
| Wireless Connectivity |
2.4GHz WiFi |
| WiFi Standard |
IEEE 802.11 b/g/n |
| Control Method |
eWeLink Mobile App |
| Relay Channels |
1 |
| Relay Type |
Electromechanical |
| Scheduling |
Supported |
| GPIO Expansion |
Available |
| 433MHz RF Control |
Not Supported |
| Protective Enclosure |
Not Included |
| PCB Type |
Open Circuit Board |
Wiring and Connection
| Connection |
Function |
| DC Input + |
Positive 5–24V DC Supply |
| DC Input − |
Ground / Negative Supply |
| Relay Output |
Switching Connection for External Load |
| GPIO |
Reserved Connections for Custom Development |
Connection Overview:
- Connect a suitable 5–24V DC power supply to the module.
- Connect the electrical load according to the relay terminal markings and the manufacturer's wiring diagram.
- Power the module and pair it with the eWeLink mobile app.
- Configure remote switching and automatic schedules.
Applications
- DIY Smart Home Automation
- Low-Voltage Lighting Control
- Remote Relay Switching
- Electronic Access Control Projects
- WiFi-Controlled Devices
- Arduino and ESP-Based Automation Projects
- Remote Equipment Switching
- Educational Electronics Projects
Important Notes
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Power Supply: Requires a regulated 5–24V DC supply.
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No 433MHz RF: This version does not support RF remote controls.
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No Enclosure: The module is supplied as an exposed PCB.
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Relay Isolation: Independent load-power switching may require a manufacturer-documented PCB modification. Do not assume the relay contacts are isolated in the default configuration.
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Load Compatibility: Verify the relay contact rating and board configuration before connecting any load.
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Mains Voltage: Do not connect mains voltage to the DC power input. Any mains-load switching requires appropriate isolation, protection, and qualified installation.
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WiFi: Supports 2.4GHz WiFi networks only.
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GPIO: Intended for advanced users familiar with electronics and firmware development.
Package Includes
