ESP32 Forum

Hi all,

I'm quite new to ESP32 and I have developed an ESP32 board using the old ESP32-WROOM-32. We are using the three UARTS of this MCU for different things and everything is working fine in the first prototypes.
Now, I've manufactured new boards but when ordering I realised that there was no ESP32-WROOM-32 stock so I went for the replacement ESP32-WROOM-32E.
When the boards arrived assembled, when testing I realised that there is no more UART1 on pins 17 and 18 of the module. Is there any way to activate the UART1 on pins 17 and 18?

Many thanks for your help.

Regards,

First of all, I think using pin 17 and 18 in ESP32-WROOM-32 module is not a recommended design since these two pins are used by internal flash. Maybe it works because it is SD2 and SD3 and you do not use 4-wire SPI. Anyway, please do not use any pins used by flash.
As for UART pins, please be noted that UART could be mapped to any GPIO. What you see that pin17 and pin18 are UART1 is because this is a IO-MUX list which means default setting. You still could configure UART to other available GPIOs.