ESP32-CAM and ADC

[davefes]

On the ESP32 you have to use ADC1 if you are using WiFi. Which pins are available on an ESP32-CAM, in Micropython, to use as an ADC.
RandomNerdTutorials say:

All these GPIOs are RTC and support ADC: GPIOs 2, 4, 12, 13, 14, and 15.

However, on the ESP32 all of these are ADC_2.

External ADC?

[scruss]

Looks like external ADC is the only way, if there are any pins left to hook something up

[davefes]

I will need to test ... that if WiFi is not connected at the time of measurement then ADC_2 would be OK to use? I don't need both running at the same time.

[bixb922]

Here is the complete list of pins https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/gpio.html

There should be ADC 1 pins available, but that depends on the board you are using.

[davefes]

I think for the ESP32_CAM (AiThinker clone) ADC_1 pins are all used for the camera or SD card. Any how they are not brought-out to the headers..