ESP32 Forum

The ADC pin input voltage measurement can be attenuated, e.g 6db reduces it to around 2.2V according to
http://esp-idf.readthedocs.io/en/latest ... dc_atten_t

But is the pin still 3.3V tolerant?

Hi Pibbotley,

Setting of ADC attenuation does not make the voltage pin rating worse.
You can still apply 3.3V to a pin at 6db attenuation, the ADC readings will only saturate.

Thanks