Rui Santos has written a great guide shows us what’s Deep Sleep and how to use it with the ESP8266 in the Arduino IDE.
With most of the ESP8266 modules, you can’t change the hardware to save power, but you can write software to do it. If you use the sleep functions with the ESP8266, it will draw less power and your batteries will last longer. In this guide, we’re going to talk about Deep Sleep with the ESP8266.
See the full post on his blog, Random Nerd Tutorials.
Check out the video after the break.