I would like to realize the conventional on / off switching (230V) additionally with Ethernet RJ45 (LAN).
A person enters the room and switch on the conventional light (230V) via a button / switch. or
A person switch the same light (230V) via a web browser On / Off as mobile/web application
Needed is a relay card for 230V with external connections (for on/off switch) + RJ45 ethernet control. Which modules of Arduino offers my requiremnts. So far, I have only encountered relay cards with 12V DC output which is mainly for WLAN applications.
I hope you have the right tip!
My graphic should clarify the project for home automation. If Ethernet is not working the conventional 230V AC is running
Hi Juray, my background is wiring AC 230V and programming.
for my opinion the grove modules can´t control an 230 V AC external switch as input and they have just a 5V/12V DC output rely. No way to change my 230 V AC switch house installation. Additional 230 V AC cabel and Ethernet cable is possible.
if you look at professional home automation components, the switch is touchable with dimming function. it has it's own mcu and communicates with central computer. but I had the impression you want a classic switch as 'backup'
You can buy a 5$ sonoff relay based on ESP8266, you can easily reprogram it from Arduino IDE. There are several variations of the device, search and find the device there fits your need and use the default firmware or make your own...