GPIO2 is a bootstrap pin that needs to be high on powerup

Hi Sprite.

Thanks for the quick response. You pointed me in the right direction.

After your advice I found this link: https://www.espboards.dev/blog/esp32-strapping-pins

Strapping pins (bootstrap pins) are special GPIO pins that ...

Hi.

I was testing my ESP32 C3 using the ESP-IDF example codes for ADC oneshot read and continuous read.

I was able to get good voltage measurements on ADC1 Channels 0, 1, 3, 4, and even ADC2 Channel 0.
However, on ADC1 Channel 2 I was getting very inaccurate measurements, and when it is not ...

I seem to have similar issues on my two ESP32 C3.

They exhibit the same problem even though they are from different factories, so I am wondering if the problem may be library related.

On my ESP32 C3 ADC1 Channel 2 (GPIO 2) the reading is much higher than expected.

To test, I built the example ...