I use a simple Xiaomi switch button outside my main door.
When the button is pressed my Google Homes chime and my Hue lamps blink. After 20.00 (when the kids sleep) only the lamps blink.
I use webcore to play a locally stored mp3 via cast-web-api (https://vervallsweg.github.io/cast-web/). So you need a local always-on computer.
Works well, but theres a couple of seconds of lag between button pressed and chime sound. Also if I listen to music on my Google Home the music is stopped.
I live in Sweden (albeit not in the north) and I must have had at least -15 C so far since last year. The button works and the batteries haven’t been replaced yet.
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