Tech Note 115 - Using the ESP32 ADC for wide range DC voltage measurements

Tech Note 143 - ESP32 – Voltage Reading (pre-calculated voltage divider) Examples

#340 How good are the ADCs inside Arduinos, ESP8266, and ESP32? And external ADCs (ADS1115)

Using Analog input of ESP32 read Potentiometer DC voltage

Tech Note 069 - Using the ESP32 ADC and some of its more advanced functions

DIY ESP32 AC Power Meter (with Home Assistant/Automation Integration)

ADC blocks and REGISTERS | Internal Reference | Internal Temperature Sensor Arduino101

Stamp-Sized ESP32 Super Mini Boards Tested: Range, Programming Tips & Best Pick

4 awesome application of op-amps in circuits

Tech Note 151 - ESP32 ADC Accuracy Improvement using the ADC reference voltage to correct readings.

Monitoring Voltage with ESPHome, D1 Mini ADC, and Home Assistant