Nest Hello doorbell - detect button press via relay

Hi, we are currently in the process of building a new house and I am deciding on what doorbell to use, since we use Google Home I would like to use Nest Hello aswell, since Ring can’t be integrated with it.
I know that through Nest component I can get the binary sensors to detect motion, but as I understand there is no way to detect the button press, which is most important (for example to turn on lights after 10sec when nobody is home and it is night).

I know that using the Nest Hello puck connected to the chime it is possible to make it ring, but my question is using this feature if I connected a relay instead of a chime, then connect the output switch pins of the relay to the input pins of Raspberry Pi where HA runs, would it be possible to detect this in the HA? Or if the relay is far from the RPi, I think it should be possible to use something like ESP8266 and send HTTP requests to HA via Wifi.

I have read somewhere that inside of the puck there is a Opto MOSFET, so maybe it would be even possible to get something more useful (on digital voltage levels) out of it to even skip the clicky relay.

Have anyone tried anything like this? Or would it even work?

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.

Thanks for the answer :slight_smile: the z wave sensor seems like a good idea, I will have to look it up. I almost forgot about some z wave gateway integration in my HA, but I reckon that I will have more z wave compatible stuff (for example those actual door sensors) in the future, so this will be the easiest method how to get the signal to HA.

I always hate, when I have to decide which smart device to get, that they are so closed with their abilities, which is totally unsuitable for some power users as I like to tinker with stuff… I wish all of them had some open APIs.