Comments on: ESP32-S3 DevKitC Pinout Reference Guide: GPIOs Explained

By: Dave Fischer

Dave Fischer — Thu, 19 Mar 2026 18:21:20 +0000

Also – my board had an open jumper (circuit board pads) labeled IN OUT that needed to be soldered together to get the 5V pin to work (using a USB C for power on USB connector). I learned this from the “Celsius temperature: -127.00 – Fahrenheit temperature: -196.60” problem I ran into working with a DS18B20 temperature sensor ( https://randomnerdtutorials.com/guide-for-ds18b20-temperature-sensor-with-arduino/ ).

By: Steve

Steve — Thu, 19 Mar 2026 18:08:49 +0000

On the OEM board from Espressif they are labeled “USB” and “UART”. The UART one is for print() output, aka , which I think on your board you are referring to as “COM”. And yes, the “USB” one is used for programming. Either can be used for loading firmware, IIRC, but I know that UART works for that since I just did that the other day.

I don’t program it with Arduino. I use Micropython and to load code (using “USB”).

By: Dave Fischer

Dave Fischer — Thu, 19 Mar 2026 17:44:21 +0000

I also learned that the serial monitor needs to connect to the other USB C port. The one labeled COM (mine are labeled COM and USB) seems to be only used for the programming. Not sure the USB could also be used for programming.

By: Sara Santos

Sara Santos — Thu, 19 Mar 2026 13:21:56 +0000

In reply to Dave Fischer.

Hi.
That’s a legit question.
And yes, that’s the answer.
Regards,
Sara

By: Dave Fischer

Dave Fischer — Wed, 18 Mar 2026 21:01:19 +0000

Never mind – figured it out – use the one labeled COM.

By: Dave Fischer

Dave Fischer — Wed, 18 Mar 2026 20:38:21 +0000

Probably a dumb question – which USB-C port is used for programming with Arduino IDE on host PC? Thanks.

By: ElFishi

ElFishi — Fri, 28 Nov 2025 07:30:33 +0000

Espressif have updated their picture showing the pinout of the DevKit. RGB_LED is now on 48.

By: J Wu

J Wu — Mon, 24 Nov 2025 21:03:05 +0000

What I found is that for I2C, it is Pin 8 and Pin 9 as marked on the DevKitC v1.1. It is not GPIO 8 and GPIO 9. If you check the pinout diagram, GPIO8 = Pin 18, GPIO9 = Pin 46 marked on the board.

When you configure the Pins in Arduino IDE, if you set Pin 8 and Pin 9 as SDA and SCL, make sure you connect these to the one marked on the board.

By: Colin

Colin — Tue, 21 Oct 2025 03:50:13 +0000

In reply to Boris.

Hi Boris, I understand that the ESP32-S3 DevKitC uses the ESP32-S3 series of SoCs, Xtensa® dual-core 32-bit LX7 microprocessor.

So not sure if you’ve have had a look at the LX7 MCU datasheet, which can be found from a Google search “LX7 microprocessor isa-summary.pdf” and currently selecting the option “Xtensa® Instruction Set Architecture (ISA) Summary” you can then read the datasheet of the LX7 MCU and Memory sections for more detail

As far as the Arduino IDE covering the full use of MCU functionality… I can’t comment, but using another IDE that allows full access to the LX7 MCU will probably do the trick. Good luck

By: Paulo Robalo

Paulo Robalo — Thu, 25 Sep 2025 13:35:04 +0000

Hello, I’ve connected an LCD to an ESP32-S3 devkit (with 16MB flash and 8MB OPI PSRAM) using HSPI bus on the default GPIOs 10~13, it runs OK 🙂
However, when I change to the VSPI bus, using GPIOs 4~7, it generates “Meditation Guru” errors.
I’m using TFT_eSPI library, easy to config and lots of features!
Gemini tells me there’s a conflict when using GPIOs 6 and 7 in ESP32-S3 board with 8MB OPI PSRAM, however you info doesn’t mention that, GPIOs 4~7 are considered safe!
Where is the problem? Could you please suggest a solution?