Library gpio.adc | Standard libraries

Library adc

To use this library in your code:

import gpio.adc

Analog-to-Digital Conversion.

This library provides ways to read analogue voltage values from GPIO pins that support it.

On most ESP32 variants, there are two ADCs. ADC1 should be preferred as ADC2 has lots of restrictions. It can't be used when WiFi is active, and some of the pins are strapping pins.

By default, ADC2 is disabled, and users need to pass in a flag to allow its use.

Examples


import gpio.adc show Adc

main:
  adc := Adc 34
  print adc.get
  adc.close

Pins

ESP32

ADC1: Pins 32-39

ADC2: Pins 0, 2, 4, 12-15, 25-27

ESP32C3

ADC1: Pins 0-4

Pin 5 is an ADC pin of channel 2. However, the controller of ADC channel 2 may enter an inoperative state and was therefore disabled by Espressif. An errata was published.

ESP32C6

ADC1: Pins 0-6

No ADC2.

ESP32P4

ADC1: Pins 16-23, 49-54

ESP32S2

ADC1: Pins 1-10

ADC2: Pins 11-20

ESP32S3