#149 ESP32 Deep Sleep, RTC Memory, "Secret" LoLin Pins

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

Links:
Sketches: https://github.com/SensorsIot/ESP32-Deep-Sleep
Excel sheet: https://github.com/SensorsIot/ESP32-Deep-Sleep/blob/master/ESP32.xlsx
Instructables: https://www.instructables.com/id/ESP32-Deep-Sleep/
ESP32 Deep-Sleep Details:
http://esp-idf.readthedocs.io/en/latest/api-reference/system/deep_sleep.html
https://media.readthedocs.org/pdf/esp-idf-fork/latest/esp-idf-fork.pdf
https://github.com/espressif/esp-idf/blob/master/docs/api-reference/system/deep_sleep.rst

Other ESP32 boards (from video #143):
TTGO ESP32 Module https://www.aliexpress.com/item/TTGO-ESP32-Dev-Module-WiFi-Bluetooth-4MB-Flash/32813561581.html
ESP32 (NodeMCU type) Board http://bit.ly/2sOMR3E
ESP32 Development Board (Yellow Pins) https://www.aliexpress.com/item/ESP32-Development-Board-WiFi-Bluetooth-Ultra-Low-Power-Consumption-Dual-Cores-ESP-32-ESP-32S-Board/32802136026.html
ESP32 X-Shield https://www.aliexpress.com/item/Lolin-ESP32-wemos-ESP32-WiFi-Modules-Bluetooth-Dual-ESP-32-ESP-32S-ESP8266/32807523301.html
ESP32 Lolin Board with LiPo https://www.aliexpress.com/item/WEMOS-LOLIN32-V1-0-0-wifi-bluetooth-board-based-ESP-32-4MB-FLASH/32814488554.html
ESP32 OLED Board http://bit.ly/2tosirM
ESP32 Board with 18650 https://www.aliexpress.com/item/WEMOS-WiFi-Bluetooth-Battery-ESP32-development-tool/32811429908.html
D1 mini ESP32 board https://www.aliexpress.com/item/MH-ET-LIVE-D1-mini-ESP32-ESP-32-WiFi-Bluetooth-Internet-of-Things-development-board-based/32816073234.html
WeMos Arduino like ESP32 Board http://bit.ly/2tUZVnC
Cheapest ESP32 board (source not tested by me): https://www.aliexpress.com/item/Lolin-ESP32-wemos-ESP32-WiFi-Modules-Bluetooth-Dual-ESP-32-ESP-32S-ESP8266/32804853522.html

WEMOS Official Store: http://s.click.aliexpress.com/e/jUzBiIq

Supporting Material and Blog Page: http://www.sensorsiot.org
Github: https://www.github.com/sensorsiot
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Official Wemos Store: http://s.click.aliexpress.com/e/jUzBiIq
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Видео #149 ESP32 Deep Sleep, RTC Memory, "Secret" LoLin Pins канала Andreas Spiess