ESP32 WROOM 32E GPIO 13 (TX), GPIO 27 (RX) cannot perform UART communication with HMI screen

maker-dev
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Joined: Wed Jun 18, 2025 8:50 am

ESP32 WROOM 32E GPIO 13 (TX), GPIO 27 (RX) cannot perform UART communication with HMI screen

Postby maker-dev » Wed Jun 18, 2025 9:02 am

Hi everyone, I would like to know any potential hardware considerations when I remap Serial1 pinouts to GPIO13 (TX) and GPIO27 (RX). I am designing a ESP32 WROOM 32E customised board for my project. GPIO13, GPIO27 can communicate (read / write) with HMI screen using the esp32 board I bought from supplier / retail store/. However, it doesn't work on my board currently. I'm not sure if my customised board missed out some hardware configuration to be handled, especially for GPIO13 and GPIO27. Because other applications (GPIO / ADC / SDIO) on my board works well. Thank you!

#define RX_PIN 27
#define TX_PIN 13
Serial1.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN);

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