#149 ESP32 Deep Sleep, RTC Memory, "Secret" LoLin Pins
Published at : 22 Dec 2025
In this video, we look into the deep-sleep functionality if the ESP32, and we are interested if and how the deep sleep works, especially because the ESP32 has a so-called ultra-low power coprocessor. This fact promises new possibilities. - We will deep-sleep the ESP32 to save lots of power for our battery-operated devices - We will use three out of four sources for wake-up: o The timer o Two possibilities of external wake-ups o Touch pads - We have a look at the available (and sometimes strangely named) ESP-32 pins of the WROOM-32 module - We use RTC memory which survives deep-sleep - And we calculate, how long the ESP32 can deep-sleep compared to the ESP8266