The ESP8266 WiFi module is the latest, made interesting because it pretty much doesn’t exist outside China. Why is it cool?

This is something that [Albert David has addressed] with his simple ESP8266-based WiFi switcher that he’s added to a string of USB-powered LEDs, and he’s neatly mounted the ESP-12 module it ...

Gadget Freak Andries “Quindor” Faassen shows you how to use an ESP8266 WiFi module to build your own network-controlled LED dimmer for indoor and outdoor lighting.

In essence, the system is akin to WiFi radar, using a battery-powered ESP8266 chip to ping a device and measure the signal.