After some searching, I ended up using a microcontroller and a piece of code borrowed from the web that I tweaked and adapted. The microcontroller-based concept was chosen because I wanted to scale ...

This lets him alert the Arduino when an object approaches the sensor without the need for polling or extra code on the Arduino side of things.

This tutorial is truly accessible if you never touched ESP8266 deep sleep before but would like to start – it’s short and sweet, and you’ll have your battery-powered sensor up and running in ...