GPIO05 ADC Not Available on seeed_xiao_esp32c3

[nkgiovannivl]

The problem

Setting GPIO05 is showing "ESP32C3 doesn’t support ADC on this pin." , but the reference pins shows me that GPIO05 it’s available.

Which version of ESPHome has the issue?

2022.12.8

What type of installation are you using?

Home Assistant Add-on

Which version of Home Assistant has the issue?

2023.2.2

What platform are you using?

ESP32-IDF

Board

seeed_xiao_esp32c3

Component causing the issue

sensor platform: adc

Example YAML snippet

esphome:
  name: clamps-my
  platformio_options:
    board_build.flash_mode: dio  

esp32:
  board: seeed_xiao_esp32c3
  variant: esp32c3
  framework:
    type: esp-idf

sensor:                                      

  - platform: adc

    pin: GPIO5

    attenuation: auto

    accuracy_decimals: 5

    id: adc_sensor_ct5

Anything in the logs that might be useful for us?

No response

Additional information

The GPIO05 should be mapped on VARIANT_ESP32C3?

https://github.com/esphome/esphome/blob/034b47c23a08f9980bdae07bcafbcf22fc43dc2e/esphome/components/adc/sensor.py#L76

[oxan]

The problem is that GPIO5 is used by ADC2, which is also used by the WiFi module: https://docs.espressif.com/projects/esp-idf/en/v4.3/esp32c3/api-reference/peripherals/adc.html

There's an open PR to add support for ADC2 when WiFi is disabled: esphome/esphome#4381

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.