ESP32-C3-MINI-H4 USB to UART not working

Sophi9999
Posts: 7
Joined: Mon Aug 19, 2024 5:22 pm

ESP32-C3-MINI-H4 USB to UART not working

Postby Sophi9999 » Tue Sep 17, 2024 5:25 pm

Hello!
I designed a board with a ESP32-C3-MINI-1-H4 and a USB to UART connection to use Arduino.
My board isn't recognized by USB and I wondered where things might be wrong.

Image

I have switches to EN (pin 8) and to GPIO9
GPIO8 measures HIGH
GPIO2 measures HIGH
GPIO9 measures HIGH and switches LOW
ESP_EN measures HIGH and switches LOW

The ESP32 measures a solid 3.3V.
Thanks in advance!
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ESP_Sprite
Posts: 9764
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-C3-MINI-H4 USB to UART not working

Postby ESP_Sprite » Wed Sep 18, 2024 12:19 am

You should short DN+ with DN2+ and DN- with DN2- otherwise your USB-C connection only works one way around; have you tried flipping it to see if it works then?

(Btw, according to the USB specs, an USB-C connector should have its shield connected directly to ground; R4/C2 are not needed.)

Sophi9999
Posts: 7
Joined: Mon Aug 19, 2024 5:22 pm

Re: ESP32-C3-MINI-H4 USB to UART not working

Postby Sophi9999 » Wed Sep 18, 2024 3:24 am

Turning over the cable worked!
Thanks @sprite and also for the USB spec info.

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