ESP_Sprite/WiFive: Thanks for the replies, much appreciated. Both of your replies are of interest. About power drops, I am currently powering from a USB cable, with a 3.3V LDO regulator AP2112K-3.3V on the custom board. This is good for up to 600mA output. The ESP32 datasheet lists in section 5.2 Ta...

I'm a bit surprised by the lack of reply here. I will just document my findings, hoping this will help somebody. To me it appears there is an issue with pin 17 of the ESP-WROOM-32, it is used by some sort of process on the board (my guess is WiFi) and this is not documented. If you hook up a scope o...

Thanks for the reply. This is interesting. I have an I2C device connected to the WROOM through pins 16 and 17. As mentioned before I can see activity on one of the pins (I have to identify which one exactly) as the board is programmed and booting. I've noticed that it is impossible to communicate wi...

Hi, Are they restrictions on the use of the GPIO pints 16 and 17 in the ESP-WROOM-32? I thought I had read somewhere that 16 and 17 are reserved for controlling the onboard flash (why would they be available for the user to connect hardware to through the castellated pins). I used these pins for I2C...