ESP doesn't boot when its RX0 and TX0 are connected

GeorgeFlorian1
Posts: 160
Joined: Thu Jan 31, 2019 2:32 pm

ESP doesn't boot when its RX0 and TX0 are connected

Postby GeorgeFlorian1 » Wed May 05, 2021 2:00 pm

Hello.
I have an ESP32 that works in AP Mode.
When its RX0 (GPIO3) and TX0 (GPIO1) pins are connected to a CubePilot, I can't connect to the ESP. If I remove the connection I can connect to the ESP.
I think that the pins are somehow pulled HIGH or LOW and the ESP32 doesn't work properly.
What other pins can I use ? The ESP is a Wroom-32.
I also have a Wrover-B at hand.
Last edited by GeorgeFlorian1 on Mon May 10, 2021 9:16 am, edited 1 time in total.

lbernstone
Posts: 635
Joined: Mon Jul 22, 2019 3:20 pm

Re: ESP doesn't work in AP mode when its RX0 and TX0 are connected

Postby lbernstone » Wed May 05, 2021 5:12 pm

Don't connect 5V circuits to the esp32. You will need to use a level shifter.

GeorgeFlorian1
Posts: 160
Joined: Thu Jan 31, 2019 2:32 pm

Re: ESP doesn't work in AP mode when its RX0 and TX0 are connected

Postby GeorgeFlorian1 » Thu May 06, 2021 9:53 am

lbernstone wrote:
Wed May 05, 2021 5:12 pm
Don't connect 5V circuits to the esp32. You will need to use a level shifter.
Reading through CubePilot documentation it seems like the ports operate at 3V3
https://docs.cubepilot.org/user-guides/ ... e-overview
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