Which UART to use for GPS - v1.0 board

[sukesh-ak]

Hi @lewisxhe
I have a V1.0 board and wants to connect a GPS to it.
Which pins can I use and what serial (in arduino)? I see UART2 => as 16 & 17 but 16 being used for OLED RST as well.

Trying this Adafruit example

[lewisxhe]

Basically most IO can be used, only need to initialize IO in the initialization call
E.g:

const int RX2 = 32;
const int RX2 = 33;
Serial1.begin(115200,RX2,TX2)

[sukesh-ak]

Thank you. Will try this and revert.

[sukesh-ak]

I tried on Adafruit Huzzah32 and it works fine. Both with standard pins and custom pins like you mentioned.

But doesn't work on the Lora board

Is this the correct pinouts? I believe mine is 1.0 version
#define RXD2 32
#define TXD2 33
Serial1.begin(115200,SERIAL_8N1,RXD2, TXD2);

[sukesh-ak]

Hi @lewisxhe Can you help to answer the above question?

[lewisxhe]

I just tell you how to use it, you can better other IO ports, such as 16, 17, 18, 19, etc. unused pins

[sukesh-ak]

I just tell you how to use it, you can better other IO ports, such as 16, 17, 18, 19, etc. unused pins

I think the issue is related to 26Mhz XTAL error. This shows when I try in ESP-IDF.
Does all the lora boards have 26Mhz or 40Mhz?