I want to develop a Wi-Fi enabled wall volume "dimmer" switch that can control the volume on a Chromecast Audio. I was thinking of using a Lutron Caseta switch and trapping the changes with a Pi that would then control the Chromecast. I am new to this community so please direct me if this or something similar has been solved.
I have not used the Lutron... Is there a better choice? I know I can control apps and google home already. But I have elderly people who just want a switch on the wall.
Any suggestions? Do I need a hub to use the Lutron or can the Pi do it by itself?