phil59 wrote:sonoff 433.JPG
With a box like the one you pilot and with the phone, and in 433 ... works in wifi ....
Do you make the same approximation when you talk about WIFI? here we have a 433MHz module, radio transmission which has no connection with WIFI which is a transmission at 2.4GHz (or 5GHz) and which also includes the communication protocol? Unless it is doubled with a WIFI gateway for direct piloting without a gateway, but that would make duplicates with the 433MHz, and knowing the aptitude of the Chinese to mention anything to sell, I look for the 433MHz only. ..
The WIFI exists ready made, but it is a computer network, it is intended to transmit a lot of information and consumes a lot of energy, I am surprised to see that it is used to drive lamps or simple relays, the only interest is to interrogate / control the lamp directly from the network (smartphone, PC ...) without going through a gateway.
For stand-alone modules (on battery or solar), 433MHz radio modules are far more economical (as long as there is no relay coil to supply), the disadvantage being that there is no true single standard like WIFI is and that you have to "build" your network yourself.
We agree that when you say WIFI, it is really WIFI a / b / c / g / n at 2.4 or 5GHz?
EDIT: when reviewing the photo, this module is well doubled in 433MHz (for the button remote control) and in WIFI b / g / n for direct access. Operating on sector here the consumption problem does not arise, for an isolated module however it would not be the right technical choice.