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Moderator: igrr

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By Luc Volders
#83017 I did something like this with an ESP8266 and MIT app-Inventor.
No dimmer but buttons.
But easliy adapted to your needs:

https://lucstechblog.blogspot.com/2018/ ... relay.html

You can also write a webserver.
Design a webpage with some sliders and use Javascript.
Then you do not need App-Inventor and uploading to the phone is much easier
as it will be just an HTML page instead of an APP.
Uses less memeory too.

Luc