[bradbatt]

Really interested in what sensor boards you used to detect everything. Have you shared any of your code at all? Sounds like a really cool project.

[StavrosK]

Yep, here you are:

https://www.stavros.io/posts/building-cheap-home-sensorcontr...

I used an ESP8266 with cheapo sensors, the whole board costs like $5 or something. The software is pretty ad-hoc but is not more than 100 lines of code.