thank you for your fast reply.
I've used different Atmega, Attiny and STM32 based boards in the past, but new to ESP32. That's the reason for my "stupid" question. ;-)
I want to use the internal ADC of the Stamp C3U. What is the maximum voltage, that can be measured? 3,3V or 5V?
I don't understand the meaning of the feature "Stamp-C3 contains 5V->3.3V DC/DC design". Does it mean, that there is a level shifter? Or does it mean, that the inputs are 5V tolerant? Or does it just mean, that 5V are accepted as power input?