Nest Hello doorbell - detect button press via relay

I have a nest Hello but also connected a binary z wave sensor connected to the chime. In this case I used a normal Fibaro door/window sensor which also has a binary input, was more convenient as it uses a battery instead of separate power. I still have a normal ‘old fashioned’ chime (the same as I had before I had the nest Hello).

So in short: Get a relay that switches when power comes to the chime (eg someone pressed the button), the other pins of the relay are connected to the binary z wave sensor which is integrated in HASS. If you don’t like zwave there are probably many other sensor you could use.

I already had this setup before I had the Nest Hello and always worked perfect and kept working after installing Nest Hello.