If you want to get started with motion sensors and the like, ESPHome makes it incredibly easy to build your own sensors.

Programming the ESP8266 is a little difficult to get off the ground with, but once you do, things are very easy. There are a few options for building the toolchain on Linux and OSX, plus some ...

These days, everything’s in the cloud. [Sebastian] from [Hacking Beaver] wondered if he could make a WiFi bug that was small and cheap besides. Enter the ESP8266 and some programming wizardry.