Iam trying here to explane how you can make a trigger when someone is pressing your Nest Hello with the use of Z-wave.
What do you need.
Importent thing is make sure your nest is working on 12V not 24V (12vac relais are cheaper and much better availble)
First step. Breakout the (reed contact) of the Neo Coolcam Sensor.
Then solder 2 wires on the the ends.
And make a litte hole in the cover off the sensor so that it can be plased back on top off the Battery.
This one looks terrible i know just a old cover i maked as example.
Now you need the chime wich is deliverd with you nest Hello and you must have installed.
The 2 wires in the red circle must being connected to the 12vac of your relais.
Then you conect the 2 wires from the doorsensor to the NC (normally clossed) contacts of the relais.
If you wanna make it a bit nicer you put all the stuff in a nice box .
And here you go, a perfect working zwave trigger to use in Homey.
- using also a chime you wil need a relais with double contacts, as you can not use the same for both.
- In europe you can use the nest hello with 12VAC instead of 24VAC