I am a software engineer by profession. Lately, just last week I fell upon the idea of reviving my childhood hobby electronics. But with serious intentions. As a part of it I want to convert all my conventional 220 V switch to smart switch which not only operates like a conventional switch but also can be operated by a app and Alexa voice command. Being a software engineer building a app wont be a problem but I am stuck with a circuit which can use Esp8266 and relay to create a smart switch. Some thing like sonoff mini or shelly 2.5
I intend to install the smart switch inside existing switch box. I am not willing to buy the switch out of box because it kills the fun, its expensive as lot of import duty, I am concerned of safety.
I believe if I build it I will be more in control of quality.
Can some one help me out where I can get such circuit diagram. Also I am open to any firmware other than tasmota.
If this is not right forum for this post. Please move to right forum and pardon me for the mistake.
Thanks in advance,