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The ESP32 ADC is an abbreviation of Analog to Digital Converter. The ESP32 is a popular microcontroller module with different features. These features include built-in analog-to-digital converters (ADCs). ESP32 ADC allows you to measure analog voltages and convert them into digital values that can be processed by the microcontroller.
The ESP32 has a 12-bit SAR (Successive Approximation Register) ADC so, it can provide a resolution of 12 bits for analog-to-digital conversion. The ADC ESP32 has a voltage reference range of 0 to 3.3 volts, and it can measure voltages within this range.
These are the channels that are sported by ESP32 devkit or Whroom board
8 channels: GPIO32 - GPIO39
10 channels: GPIO0, GPIO2, GPIO4, GPIO12 - GPIO15, GOIO25 - GPIO27
| ADC1 | ADC2 | ADC3 | ADC5 | ADC6 | ADC7 |