• TTGO T-Call:
  https://github.com/Xinyuan-LilyGO/TTGO-T-Call
• S8089 DC/DC:
  https://de.aliexpress.com/item/32734295454.html
• IP5206, Battery Management:
  https://lcsc.com/product-detail/PMIC-Battery-Management_IP5206_C181697.html

• https://docs.espressif.com/projects/esp-idf/en/latest/hw-reference/get-started-devkitc.html
• https://docs.espressif.com/projects/esp-idf/en/latest/hw-reference/index.html

Source: https://docs.espressif.com/projects/esp-idf/en/latest/hw-reference/modules-and-boards.html

ESP32 WROVER-B Datasheet

Source: https://www.instructables.com/id/The-Incredible-ESP32-Wrover-From-Espressif/

STILL MISSING!

Pinout diagram by RandomNerdTutorial

Source: https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

RandomNerdTutorial also provides a informative list of WROOM-32 GPIO pins with descriptions with pins are free to use.

Source: https://randomnerdtutorials.com/esp32-touch-wake-up-deep-sleep/

• ESP8266 to MySQL: https://randomnerdtutorials.com/esp32-esp8266-mysql-database-php/
• ESP32 both I2C: https://www.az-delivery.de/blogs/azdelivery-blog-fur-arduino-und-raspberry-pi/esp32-beide-i-c-schnittstellen-verwenden

Used as reference implementation for WROVER integration.

Source: https://github.com/Xinyuan-LilyGO/TTGO-T-Call|

• Issues on Github Repo: https://github.com/Xinyuan-LilyGO/TTGO-T-Call/issues/13

• Instructables: https://randomnerdtutorials.com/esp32-sim800l-publish-data-to-cloud/

Source: https://nettigo.eu/products/sim800l-gsm-grps-module

Andreas Spiess:

• #155 The 5 Best Solar ChargerBoards for Arduino and ESP8266
• #160 40 Cent Do-It-Yourself Li-Ion Protectors for 18650 Cells (Tutorial) and how they work

Source: https://www.14core.com/wiring-bootloading-and-flashing-the-espressif-esp32-wrover/