I see, I got caught by the inactive timeout.
did the trick.

I did some test with light sleep.

My router beacon interval is set at the default 100ms.

If I set the router DTIM to 100 then light sleep works as expected, the device sleeps for 10 seconds.

However, if I set the router DTIM to 255, the device will still only sleep for about 10s. The rest of the ...

Please be noted that for ESP32-C3, min. voltage for all power domains is 3.0 V, so the lowest voltage is limited by ESP32-C3 not flash.

Thank you.

Since the flash on the wroom seems to be minimum 2.7v according to BOM, is it possible that the module could be used down to 2.7v instead of the stated 3.0v in the datasheet?

Gpio18 and gpio19 are used for usb but can they also be used for i2c?