I’m trying to simply get the GPS data using ESP32-WROOM and Quectel L80 module. I want to send GPS data to my PC using Serial Monitor. So I have 2 UART configurations; one for GPS module and one for the debug message. Problem is when I connect GPS module to pins 16 and 17 I cannot get the GPS data correctly but I’m able to send debug messages to my PC. When I connect GPS module to pins 1 and 3 I’m able to get raw data correctly but this time not able to send debug messages to my PC.

According to my researchs they interact with each other even though I set the HardwareSerial to 2 for GPS communication. So I tried to close and open one another when using each of them but as long as I initialize UART for GPS module I’m not able to read any debug message (when module’s pins are 16 and 17). I tried to use UART1 and if I didn’t understand wrong I cannot use pins 9 and 10, because they’re interconnected to something else. So I used pins 12 and 13 but still no difference. I also tried the same code in two different ESP32-WROOM and one ESP32-C3 Mini but results are still the same. If I connect GPS module directly to my PC I’m able to get raw data so I have no problem with the module. From the examples on the net I’ve seen that they’re using SoftwareSerial for configuration but I think that library is not available for ESP32. There’s another library called ESPSoftwareSerial but couldn’t manage to make it work either.

Arduino IDE version: 2.3.2

I tried so many kinds of code but this is the simplest form:

#include "HardwareSerial.h"

// Define the GPIO pins you want to use for UART
#define UART_TX_PIN 17
#define UART_RX_PIN 16

// Create an instance of HardwareSerial
HardwareSerial mySerial(2);

void setup() {
  // Begin serial communication at 115200 baud
  Serial.begin(115200);
  // Initialize UART2 with custom TX and RX pins
  mySerial.begin(9600, SERIAL_8N1, UART_RX_PIN, UART_TX_PIN);
  // Print a message to the default Serial (USB) console
  Serial.println("UART2 configured on custom pins!");
}

void loop() {
  // Send data via UART2
  mySerial.println("Hello from UART2!");
  delay(1000);
  // Check for incoming data on UART2
  if (mySerial.available()) {
    String received = mySerial.readString();
    Serial.print("Received on UART2: ");
    Serial.println(received);
  }

  // Wait for a second
  delay(1000);
}