Stamp C3U - Maximum GPIO input voltage?

o8of15

Hi,

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?

Thanks.

felmue

Hello @o8of15

DC/DC design in this case means there is a DC/DC converter for the power input so the M5StampC3U can be powered by USB / 5V. However the GPIOs are all 'naked' - there are no level shifters. And no, in general ESP32 GPIOs are not 5 V tolerant - 3.3 V is the maximum.

Please also have a look at the schematic.

Thanks
Felix

o8of15

Hi Felix,
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. ;-)

Thanks again.