Sonoff | Smart Plug-in Unit

Description

Sonoff S31 is a Wi-Fi smart plug for controlling appliances without rewiring. It uses the eWeLink app and can be reflashed for local control with ESPHome or Tasmota.

Sonoff S31 smart plug

Overview

My Implementation

Not currently deployed; evaluating fit for this setup.

Device Score Summary

CategoryScoreRationale
Features★★★☆☆Core capabilities documented; model-specific depth varies.
Interoperability★★★☆☆Integration available via documented methods.
Setup Ease★★★☆☆Typical setup for this device category.
Cloud Dependency★★★☆☆Depends on integration and firmware options.
Vendor Trust★★★☆☆Based on available documentation and product lineage.
Overall★★★☆☆Solid option when matched to the right use case.

★★★★★ Exceptional | ★★★★☆ Very Good | ★★★☆☆ Good Enough | ★★☆☆☆ Frustrating | ★☆☆☆☆ Avoid

Features

  • Wi-Fi smart plug for on/off control
  • 2.4 GHz Wi-Fi connectivity
  • eWeLink app support
  • Custom firmware support
  • Energy monitoring on some variants

Specifications

ProtocolWi-Fi 2.4 GHz
Hub RequiredNo
PowerAC outlet
Cloud DependencyCloud by default; local when reflashed
HA IntegrationSonoff (eWeLink) or ESPHome/Tasmota
Voice ControlAlexa/Google via eWeLink
DimensionsPlug-in module
WarrantySee Sonoff

Home Assistant Integration

Integration Method: Sonoff (eWeLink) integration or ESPHome

  • Requirements: eWeLink account for cloud; USB adapter for flashing
  • Entities: Switch entity (and power sensors if supported)
  • Setup: Add Sonoff integration or adopt via ESPHome
  • Notes: Check variant for energy monitoring

Practical Considerations

  • Choose the correct amperage rating
  • Use local firmware for fast automations
  • Avoid using for high inrush loads

References