With most smart lighting devices, the switch needs to be powered on continually in order to have the ‘smart’ ability available – and the Sonoff is no different.
One thing that is different, however, is that the power on state has 3 distinct options which are selectable . Typically the power on state cannot be changed on many systems. Each option is described in detail :
1) ON : As per video, this is the option I prefer. This means when power is restored for whatever reason, the bulb defaults to on. Effectively, this means the switch can be used as a traditional switch with the lever. A negative, though, would be a power cut in the middle of night and having your house default to on …
2) OFF : This is the default setting and means that the lever can’t be used traditionally. If power is cut and restored, everything remains in the off state.
3) KEEP : This means that when power is restored, the lights go back to what their previous settings was. Lights that were on, go to on – and off, go to off. A great thing with the options is that each light can be set individually.
The Sonoff 433Mhz remote control can be synced to either a Slampher or Sonoff RF. It comes with 4 buttons and can be used to control the light on/off from around 15m line of site without the app. In conjunction with the eWeLink scene function , a number of lights around a property can be groups and controlled with a single click. Ideal for cases where external lights can be activated as one driving up the drive way ; cases where a phone/app is not needed or immobile.
We’ve been asked a number of times if there are any responsiveness or latency issues with Sonoff switches, whether on GSM/cellular or WiFi. We’ve decided to upload this video showing near instant operation on WiFi.
The phone used in the demonstration is a Huawei P9 running Android 7.0. The switches area combination between an S20 wall socket, a Sonoff POW unit and a Sonoff Basic units.