ESP32 Forum

Hi there,
I wanted to design an open source dev board for the S2 WROVER that exposes all pins (In my design all except IO0 are there)

This is the schematic v1: https://github.com/martinberlin/H-S2-wr ... EMATIC.pdf

Minimum requirements for my design:

Lipo charger and a 2 leds indicator (charge, full)
All GPIOs exposed
No Serial-to-UART. Only dfu USB, please check this blog post from Espressif

I'm not 100% sure how is to flash a board using DFO for the first time. But I would like to try out doing a board without the need for a USB-to-UART chip.
Note: I'm kind of a newbie with Kicad and I just started one month ago, so be easy on me!

Can anyone give it a short review?

Thanks a lot, will modify it and upload it here again.
This is more or less the components distribution

With regards to the component placement, be sure to follow our hardware design guidelines, especially the bit about module placement (which you seem to do right) and the need for a keepout zone under the antenna. You don't want a ground plane messing up your reception.

Thanks ESP_Sprite,
I will give a good read to that. I see that some boards directly cut the PCB around the antenna. But if I get it right, the only requirements of the Keep out area is that there are no cooper traces or GND panes around the area. It's not a requirement to cut the PCB I guess, although I could also do it, will redesign it and post it here before sending some to JLPCB. My goal is to test this DFO flashing / debugging and ultimately make a EPDiy S2 epaper controller with reduced components (Probably with the help of more experienced developers, otherwise nothing will work )

fasani wrote: ↑

Thu Feb 03, 2022 7:17 am

But if I get it right, the only requirements of the Keep out area is that there are no cooper traces or GND panes around the area.

I think both are allowed, I don't think the dielectric difference between PCB material and air is such that it makes a large difference. Just don't put anything conductive there.