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

Video Description

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 If you want to support the channel and buy from Banggood use this link to start your shopping: https://bit.ly/2jAQEf4 (no additional charges for you) Official Wemos Store: http://s.click.aliexpress.com/e/jUzBiIq https://www.facebook.com/SensorsIOT/ https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/