ESP32 WROVER (I) Pullup Resistors

tony07881
Posts: 4
Joined: Wed Mar 06, 2019 7:58 pm
Location: Ohio

ESP32 WROVER (I) Pullup Resistors

Postby tony07881 » Thu Mar 07, 2019 12:51 pm

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

ESP_Stone
Posts: 19
Joined: Mon Nov 19, 2018 3:59 am

Re: ESP32 WROVER (I) Pullup Resistors

Postby ESP_Stone » Mon Mar 11, 2019 2:24 am

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...

tony07881
Posts: 4
Joined: Wed Mar 06, 2019 7:58 pm
Location: Ohio

Re: ESP32 WROVER (I) Pullup Resistors

Postby tony07881 » Wed Mar 13, 2019 7:00 pm

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?

ESP_Stone
Posts: 19
Joined: Mon Nov 19, 2018 3:59 am

Re: ESP32 WROVER (I) Pullup Resistors

Postby ESP_Stone » Mon Mar 18, 2019 2:09 am

Hey, you can post your schematic here and we can help to have a double check.

tony07881
Posts: 4
Joined: Wed Mar 06, 2019 7:58 pm
Location: Ohio

Re: ESP32 WROVER (I) Pullup Resistors

Postby tony07881 » Mon Apr 29, 2019 12:43 pm

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.
Last edited by tony07881 on Wed May 22, 2019 3:16 pm, edited 1 time in total.

tony07881
Posts: 4
Joined: Wed Mar 06, 2019 7:58 pm
Location: Ohio

Re: ESP32 WROVER (I) Pullup Resistors

Postby tony07881 » Tue May 07, 2019 10:55 am

Schematic is posted. Interested in any feedback you can provide. Thanks!

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