https://learn.adafruit.com/adafruit-esp32-s2-tft-feather/i2c-on-board-sensor
LC709203 Battery Monitor | Adafruit ESP32-S2 TFT Feather | Adafruit Learning System
What has all the features of a Feather main board, the comforting warmth of an ESP32-S2 WiFi microcontroller, and the crispness of a 240x135 pixel color TFT...
battery monitoradafruittftfeatherlearning