XIAO ESP32C3 Multiple Software Serial Ports

Excellent Forum Solutions XIAO
12

Hi there,

Try this and I will post what I see…

#include <TinyGPSPlus.h>
#include <HardwareSerial.h>

// Create a TinyGPSPlus instance to parse the GPS data.
TinyGPSPlus gps;

// Use HardwareSerial for the GPS. On the ESP32-C3, UART0 is usually used for USB serial,
// so we can use UART1 for the GPS.
HardwareSerial SerialGPS(1);

// Define the pins for the GPS.
const int gpsRXPin = 9; // GPS TX goes to ESP32 RX (pin 9)
const int gpsTXPin = 10; // GPS RX goes to ESP32 TX (pin 10)

const uint32_t gpsBaud = 9600;

void setup() {
  // Start the primary hardware Serial (for USB debugging) at 115200 baud.
  Serial.begin(115200);
  while (!Serial) {
    ; // Wait for Serial connection.
  }
  Serial.println("Starting GPS example using HardwareSerial on ESP32-C3");
  
  // Begin HardwareSerial on UART1 for GPS.
  // The constructor for begin() is: begin(baud, config, rxPin, txPin)
  SerialGPS.begin(gpsBaud, SERIAL_8N1, gpsRXPin, gpsTXPin);
  Serial.println("GPS HardwareSerial initialized.");
}

void loop() {
  // Feed any available GPS data from SerialGPS to TinyGPSPlus.
  while (SerialGPS.available() > 0) {
    char c = SerialGPS.read();
    gps.encode(c);
  }

  // Print some parsed GPS data every second.
  static unsigned long lastPrint = 0;
  if (millis() - lastPrint > 1000) {
    lastPrint = millis();
    Serial.print("Satellites: ");
    Serial.print(gps.satellites.value());
    Serial.print("  Latitude: ");
    Serial.print(gps.location.lat(), 6);
    Serial.print("  Longitude: ");
    Serial.println(gps.location.lng(), 6);
  }
}

HTH
GL :slight_smile: PJ :v:

example that uses HardwareSerial instead of SoftwareSerial for the GPS on pins 9 (RX) and 10 (TX):

  • HardwareSerial Instance:
    We create a HardwareSerial instance named SerialGPS on UART1. On the ESP32-C3, you generally have at least two UARTs available (UART0 is used for USB serial, so UART1 is free for your peripheral).
  • Pin Assignment:
    We assign gpsRXPin (9) and gpsTXPin (10) for the GPS. Make sure your wiring matches this (i.e., the GPS module’s TX should connect to ESP32’s RX and vice versa).
  • Reading and Parsing Data:
    The loop reads available data from SerialGPS and feeds it into TinyGPSPlus for parsing.

Check the serial monitor for startup and data , LMK
:v:

Starting GPS example using HardwareSerial on ESP32-C3
GPS HardwareSerial initialized.
Satellites: 0  Latitude: 0.000000  Longitude: 0.000000
Satellites: 0  Latitude: 0.000000  Longitude: 0.000000
Satellites: 0  Latitude: 0.000000  Longitude: 0.000000
Satellites: 0  Latitude: 0.000000  Longitude: 0.000000