Good evening. I just bought an ESP32-EVB rev-I board from Amazon and it works fine except that the board doesn't reset at power on, but you have to reset it by reset push-button.
I see from the schematic that R24 pullup resistor on the reset line is supposed to be 1K while it's 10K on the board, but noting changes placing a 1K resistor there.
I had to add a 47uF condenser in parallel to the reset button to have it pull down the reset line at boot.
Is this ok on your experience or do I have to do something different?
Best regards.
Edmondo Gigli
> I see from the schematic that R24 pullup resistor on the reset line is supposed to be 1K while it's 10K on the board
Probably you saw the wrong schematic. The schematic for revision I is here:
https://github.com/OLIMEX/ESP32-EVB/tree/master/HARDWARE/REV-I
> ...had to add a 47uF condenser in parallel to the reset button to have it pull down the reset line at boot.
There is already such in revision I, it is called C31.
We experimented a lot with the value of R24 but what we had in revision I along with adding C31 yielded best results. Aka this part of the change log:
Added C31(1uF/10V/10%/X5R/C0603) on the ESP_EN signal and R24's value changed from 1k/0603 to 10k/0603;