[Solved] Which board? ESP32-WROOM-32U

ESPHome
1

I have been using “board: esp32dev” for this MCU:
ESP32-WROOM-32U
… it’s the one with the external antenna.
Underneath the breakout board is the designation “ESP32_devkitC_v4”
Whilst I can use esp32dev successfully, GPIO35 is flagged as IN only and not IO. However, the spec for ESP32-WROOM-32U shows pin 35 should be IO.
Q: Is there a better board I should select in the YAML, because I can’t find a match?
A similar question was asked in 2024, but remained unanswered (esp32-wroom-boards-which-one/711245)
Thanks,
Ric

2

Do these help?

3

From where?
WROOM-32U datasheet gives:

image
image877×328 49.1 KB

And your board esp32dev is correct for your MCU.

4

Hello,

Thanks for the swift reply.

I have bee looking at both of those and there is no obvious match. I tried “MH ET LIVE ESP32DevKIT” board: mhetesp32devkit, but it still shows an error on GPIO35.

The work-around, for me, has been to use some other GPIO pin.

5

Yes, thank you.
I should have gone to GitHub as a first port of call.
Regards,
Ricv

6

You’re welcome.
Also, note that you can use
variant: esp32
and not define board at all.