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ESP32 WROVER (I) Pullup Resistors

Posted: Thu Mar 07, 2019 12:51 pm
by tony07881
I'm making a custom PCB using the ESP32-WROVER (I). The silkscreen on my device says ESP32-WROVER-V4 and has 18 16 at the top. I've read through the documentation multiple times and have searched the forum but still I'm confused and have several questions.
1) Should I include a pull-up resistor on my board for any GPIO I use? Should it be 10k or 4.7k?
2) I want to use the on-board memory (16MB) but I'm not certain if I should configure it for 3.3V or 1,8V. Also want to confirm where I place resistor for config.
3) My custom PCB was recognized as a serial device on my Windows PC but I could not get the SW flash to execute. I'm using reset circuitry found in a number of examples, but the SW flash never kicks off (using the latest Arduino IDE). I do not have any pull-up / down resistor on GPIO 0. Wondering if I should?
Any words of wisdom or pointing me to pertinent information is greatly appreciated. Thanks
-TO

Re: ESP32 WROVER (I) Pullup Resistors

Posted: Mon Mar 11, 2019 2:24 am
by ESP_Stone
1)No need...
2)It is 1.8V on-board configured. No external resistor needed. But take good care of GPIO12 whose power-on status decides the supply voltage for flash. And also, we can configure registers to change the voltage level after power on...
3)Please post your schematic here, thanks...

Re: ESP32 WROVER (I) Pullup Resistors

Posted: Wed Mar 13, 2019 7:00 pm
by tony07881
Thanks for the response. If no need for pull-up resistors, let me clean up my schematic a bit and I will post it. I did read that correctly? No need for pull-ups?

Re: ESP32 WROVER (I) Pullup Resistors

Posted: Mon Mar 18, 2019 2:09 am
by ESP_Stone
Hey, you can post your schematic here and we can help to have a double check.

Re: ESP32 WROVER (I) Pullup Resistors

Posted: Mon Apr 29, 2019 12:43 pm
by tony07881
Sorry for the delay in reply. Had an accident and ended up in hospital for a while. I've attached a pdf of my updated schematic. The update corrected a circuit error and removed pullups. Happy to hear any feedback. Thank you.

Re: ESP32 WROVER (I) Pullup Resistors

Posted: Tue May 07, 2019 10:55 am
by tony07881
Schematic is posted. Interested in any feedback you can provide. Thanks!