ESP32-C3-MINI-1U GPIO3 Output

Scrounch
Posts: 6
Joined: Wed Aug 13, 2025 8:07 am

ESP32-C3-MINI-1U GPIO3 Output

Postby Scrounch » Thu Oct 02, 2025 12:02 pm

Hi,
I'm here again regarding my board.
I've done a v2. Based on v1 hand modified.
But now I can't drive GPIO3. It was previously working.

I checked, I have the same ESP32-C3 module as before : M4N4.
I also have the same code.
I checked the datasheet again, and GPIO3 doesn't seem to be reserved for other things.
Can someone help me ?

Minatel
Espressif staff
Espressif staff
Posts: 432
Joined: Mon Jan 04, 2021 2:06 pm

Re: ESP32-C3-MINI-1U GPIO3 Output

Postby Minatel » Thu Oct 02, 2025 1:32 pm

Hi,

Can you please provide us with more details about your project. Sharing the schematics is always welcome.

Scrounch
Posts: 6
Joined: Wed Aug 13, 2025 8:07 am

Re: ESP32-C3-MINI-1U GPIO3 Output

Postby Scrounch » Thu Oct 02, 2025 2:50 pm

Here my schematic.
I'm using GPIO3 to send a BLE State to my PIC18 to control the LED.
But after configure the GPIO3 as an OUTPUT on Arduino IDE, nothing came out.
If I'm using same code in Arduino but change GPIO3 by GPIO6 it is working perfectly as it should !

As I said, it worked fine on previous version of my board.

Thanks for the help.
Attachments
3.png
ESP32-C3 for wireless com
3.png (41.83 KiB) Viewed 1858 times
2.png
USB Connection for Programming
2.png (62.04 KiB) Viewed 1858 times
1.png
PIC18 for intern management
1.png (71.25 KiB) Viewed 1858 times

Scrounch
Posts: 6
Joined: Wed Aug 13, 2025 8:07 am

Re: ESP32-C3-MINI-1U GPIO3 Output

Postby Scrounch » Sat Oct 04, 2025 3:56 pm

Issue solved! It was only my load (the PIC18) which didn't take changes about this pin and grounded the pin.

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