Some Datatesheets / Tech Doc
Adafruit Solar Charger
Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger - bq24074
https://www.adafruit.com/product/4755#technical-details
ESP Cam Programming
https://randomnerdtutorials.com/program-upload-code-esp32-cam/
MPU 9250
https://cdn.sparkfun.com/assets/learn_tutorials/5/5/0/MPU-9250-Register-Map.pdf
https://github.com/sparkfun/SparkFun_MPU-9250-DMP_Arduino_Library
https://learn.sparkfun.com/tutorials/9dof-razor-imu-m0-hookup-guide#using-the-mpu-9250-dmp-arduino-library
https://github.com/hibit-dev/mpu9250/
HelTec LoRa32 (ESP32) Board
Version 3:
HTIT-WB32LA_V3(Rev1.1).pdf