LOL, I don’t have anything connected, just checking the ports working
It’s polling the Device.
What GPS slab are you using, I’ll dig out my Air530 and start with that too, I have a "L76K GNSS " in the package too, so I can try it.
So two GPS units one Xiao that’s the GAme?
Ah’ I see… So red LED’s are a NO -Go right , Green on SAT lock ?
or what?
One is in the wrong plug.
Well… the current project is to read GPS data and echo it to the Nextion Display… but both devices what hardware serial connection
this study has resulted in the understanding that software serial does not work on ESP
Ok, Actually it does, but the implimintation is Nuanced…
i.e. only works a certain way on ESP that works on other either way, Go figure.
STart with the Hardware Serial , method assign the 9 & 10 pin & plugg the last grove wire into one.
Then use the software serial and pins 6 & 7 and two connectors over.
LMK
You can’t use those last two groves together as uarts
Unless you flip the pins on the first one
USE— > J6 and J8
on this gps the red blinks when it is transmitting once per second… but yes, the gps goes not get a good lock when unplugged or inside… but it will communicate the time… and even if it has not even locked the time yet… it will send a checksum that changes… thats why I was using the fullexample sketch
Roger that. I see so both are send a clock…data byte on their respective serial ports.
yes good catch… I tried every port to make sure they all would work with SAMD… I just didnt remove it
Pull J7 and see what you get any ?
I found some stuff ,so I’m going to have a sangwhich and Libation(s) and BRB , I’ll hook up what I have to a c3.
BRB
must be something wrong with the C3 or My C3 because i just ran the S3 and got something working
LOL, I just got it going with the C3 , LOL
and the Air530 on 9 & 10, 
5 sats and counting…
HTH
Gl PJ
atellites: 5 Latitude: 26.042034 Longitude: -80.220633
Satellites: 5 Latitude: 26.042032 Longitude: -80.220634
Satellites: 5 Latitude: 26.042029 Longitude: -80.220636
Satellites: 5 Latitude: 26.042027 Longitude: -80.220637
Satellites: 5 Latitude: 26.042023 Longitude: -80.220639
Satellites: 5 Latitude: 26.042016 Longitude: -80.220645
Satellites: 5 Latitude: 26.042012 Longitude: -80.220647
Satellites: 5 Latitude: 26.042009 Longitude: -80.220648
Satellites: 5 Latitude: 26.042005 Longitude: -80.220649
Satellites: 5 Latitude: 26.042002 Longitude: -80.220649
Satellites: 5 Latitude: 26.041998 Longitude: -80.220651
Satellites: 5 Latitude: 26.041995 Longitude: -80.220652
Satellites: 5 Latitude: 26.041991 Longitude: -80.220653
Satellites: 5 Latitude: 26.041989 Longitude: -80.220653
Satellites: 5 Latitude: 26.041985 Longitude: -80.220654
Satellites: 5 Latitude: 26.041980 Longitude: -80.220
thanks for the proof!
No worries,
Pins 9 & 10 with Hardware serial… Like a BOSS!
straight Grove cable. J8 is the Money! 
we have 6 from the Lab Window…
Satellites: 6 Latitude: 26.041696 Longitude: -80.220917
Satellites: 6 Latitude: 26.041696 Longitude: -80.220917
Satellites: 6 Latitude: 26.041696 Longitude: -80.220916
Satellites: 6 Latitude: 26.041697 Longitude: -80.220916
Satellites: 6 Latitude: 26.041704 Longitude: -80.220914
Satellites: 6 Latitude: 26.041712 Longitude: -80.220912
Satellites: 6 Latitude: 26.041721 Longitude: -80.220909
Satellites: 6 Latitude: 26.041729 Longitude: -80.220907
Satellites: 6 Latitude: 26.041729 Longitude: -80.220907
Satellites: 6 Latitude: 26.041728 Longitude: -80.220906
Satelli
up to 8 right NOW
Ok , went to the other code added hardware serial , going , good, adding 2nd gps now…
1.7 26.041622 -80.220879 176 02/23/2025 02:07:14 176 26.50 284.30 1.00 WNW 7108 43.06 NE 3045 10 0
6 1.7 26.041618 -80.220879 179 02/23/2025 02:07:15 179 26.60 284.30 1.26 WNW 7108 43.06 NE 3654 12 0
6 1.7 26.041613 -80.220886 181 02/23/2025 02:07:16 181 26.60 284.30 1.20 WNW 7108 43.06 NE 4263 14 0
6 1.7 26.041611 -80.220894 193 02/23/2025 02:07:17 193 26.70 284.30 0.00 WNW 7108 43.06 NE 4872 16 0
6 1.7 26.041607 -80.220901 200 02/23/2025 02:07:18 200 26.70 284.30 0.00 WNW 7108 43.06 NE 5481 18 0
6 1.7 26.041603 -80.220909 205 02/23/2025 02:07:19 205 26.70 284.30 0.00 WNW 7108 43.06 NE 6090 20 0
6 1.7 26.041601 -80.220917 209 02/23/2025 02:07:20 209 26.80 284.30 0.00 WNW 7108 43.06 NE 6699 22 0
6 1.7 26.041603 -80.220909 219 02/23/2025 02:07:21 219 26.80 284.30 0.00 WNW 7108 43.06 NE 7308 24 0
6 1.7 26.041605 -80.220901 214 02/23/2025 02:07:22 214 26.80 284.30 2.78 WNW 7108 43.06 NE 7917 26 0
6 1.7 26.041605 -80.220894 220 02/23/2025 02:07:23 220 26.80 284.30 2.83 WNW 7108 43.06 NE 8526 28 0
6 1.7 26.041605 -80.220886 220 02/23/2025 02:07:24 220 26.70 284.30 2.83 WNW 7108 43.06 NE 9135 30 0
6 1.7 26.041605 -80.220879 218 02/23/2025 02:07:25 218 26.60 284.30 2.87 WNW 7108 43.06 NE 9744 32 0
5 15.8 26.041605 -80.220871 216 02/23/2025 02:07:26 216 26.50 284.30 2.89 WNW 7108 43.06 NE 10358 34 0
5 15.6 26.041603 -80.220871 219 02/23/2025 02:07:27 219 26.40 284.30 1.20 WNW 7108 43.06 NE 10972 36 0
5 15.5 26.041603 -80.220879 227 02/23/2025 02:07:28 227 26.20 284
I got one hardware going on S3
one of the gps is acting up… i dont know if the cmos battery is dead or what
Hi there,
I got them Both going on the C3, edited the example to add a column for which GPS is sending data , based on Age as Priority GPS-1 or GPS-2
10 1.0 26.041754 -80.220909 267 02/23/2025 10:34:16 769 5.50 0.00 0.00 N 7108 43.06 NE 16160 490 1 GPS 2
10 1.0 26.041754 -80.220909 268 02/23/2025 10:34:17 768 5.50 0.00 0.00 N 7108 43.06 NE 16227 492 1 GPS 2
10 1.0 26.041754 -80.220909 275 02/23/2025 10:34:18 774 5.50 0.00 0.00 N 7108 43.06 NE 16293 494 1 GPS 2
10 1.0 26.041754 -80.220909 276 02/23/2025 10:34:19 776 5.50 0.00 0.00 N 7108 43.06 NE 16360 496 1 GPS 2
10 1.0 26.041754 -80.220909 283 02/23/2025 10:34:20 782 5.50 0.00 0.00 N 7108 43.06 NE 16426 498 1 GPS 2
10 1.0 26.041754 -80.220909 284 02/23/2025 10:34:21 785 5.50 0.00 0.00 N 7108 43.06 NE 16493 500 1 GPS 2
10 1.0 26.041754 -80.220909 289 02/23/2025 10:34:22 790 5.50 0.00 0.00 N 7108 43.06 NE 16559 502 1 GPS 2
7 1.3 26.041683 -80.220894 290 02/23/2025 10:34:23 835 27.80 150.56 0.52 SSE 7108 43.06 NE 14595 321 1 GPS 1
10 1.0 26.041754 -80.220909 296 02/23/2025 10:34:24 796 5.50 0.00 0.00 N 7108 43.06 NE 16692 506 1 GPS 2
10 1.0 26.041754 -80.220909 297 02/23/2025 10:34:25 797 5.50 0.00 0.00 N 7108 43.06 NE 16758 508 1 GPS 2
10 1.0 26.041754 -80.220909 299 02/23/2025 10:34:26 803 5.50 0.00 0.00 N 7108 43.06 NE 16825 510 1 GPS 2
10 1.0 26.041754 -80.220909 299 02/23/2025 10:34:27 800 5.50 0.00 0.00 N 7108 43.06 NE 16891 512 1 GPS 2
10 1.0 26.041754 -80.220909 311 02/23/2025 10:34:28 805 5.40 0.00 0.00 N 7108 43.06 NE 16958 514 1 GPS 2
10 1.0 26.041754 -80.220909 312 02/23/2025 10:34:29 813 5.40 0.00 0.00 N 7108 43.06 NE 17024 516 1 GPS 2
10 1.0 26.041754 -80.220909 317 02/23/2025 10:34:30 818 5.40 0.00 0.00 N 7108 43.06 NE 17091 518 1 GPS 2
7 1.3 26.041712 -80.220924 318 02/23/2025 10:34:31 870 27.70 150.56 0.00 SSE 7108 43.06 NE 15098 337 1 GPS 1
7 1.3 26.041712 -80.22092
Scroll over to the Right most edge…
Hardware Serial on one port and Software Serial on the other. You can swap them too. AFAIK.
#include <TinyGPSPlus.h>
#include <SoftwareSerial.h>
#include <HardwareSerial.h>
// ------------------ GPS Configurations ------------------
// For GPS 1 (HardwareSerial on UART1)
const int gps1RXPin = 9; // Connect GPS1 TX to ESP32 RX (pin 7)
const int gps1TXPin = 10; // Connect GPS1 RX to ESP32 TX (pin 6)
const uint32_t gps1Baud = 9600;
// For GPS 2 (SoftwareSerial)
const int gps2RXPin = D7; // Connect GPS2 TX to ESP32 RX (pin 9)
const int gps2TXPin = D6; // Connect GPS2 RX to ESP32 TX (pin 10)
const uint32_t gps2Baud = 9600;
// ------------------ Objects ------------------
TinyGPSPlus gps1; // For HardwareSerial GPS
TinyGPSPlus gps2; // For SoftwareSerial GPS
// Use UART1 for GPS 1:
HardwareSerial SerialGPS1(1);
// Use SoftwareSerial for GPS 2:
SoftwareSerial SerialGPS2(gps2RXPin, gps2TXPin); // (RX, TX)
// ------------------ Function Prototypes ------------------
static void smartDelay(unsigned long ms);
static void printFloat(float val, bool valid, int len, int prec);
static void printInt(unsigned long val, bool valid, int len);
static void printDateTime(TinyGPSDate &d, TinyGPSTime &t);
static void printStr(const char *str, int len);
static void printGPSSource();
void setup() {
Serial.begin(9600);
delay(2000);
Serial.println("\nFullExample.ino");
Serial.println("An extensive example of many interesting TinyGPSPlus features");
Serial.print("Testing TinyGPSPlus library v. ");
Serial.println(TinyGPSPlus::libraryVersion());
Serial.println("by Mikal Hart, tweaked for 2 GPS by PJG");
Serial.println();
Serial.println("Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum GPS");
Serial.println(" (deg) (deg) Age Age (m) --- from GPS ---- ---- to London ---- RX RX Fail");
Serial.println("----------------------------------------------------------------------------------------------------------------------------------------");
// Initialize GPS 1 (HardwareSerial) on UART1 with assigned pins.
SerialGPS1.begin(gps1Baud, SERIAL_8N1, gps1RXPin, gps1TXPin);
Serial.println("GPS-1 HardwareSerial initialized on pins 6 (RX) and 7 (TX).");
// Initialize GPS 2 (SoftwareSerial) on pins 9 & 10.
SerialGPS2.begin(gps2Baud);
Serial.println("GPS-2 SoftwareSerial initialized on pins 9 (RX) and 10 (TX).");
Serial.println();
}
void loop() {
// Process incoming GPS data for both GPS units.
// For GPS1 via HardwareSerial:
while (SerialGPS1.available() > 0) {
char c = SerialGPS1.read();
gps1.encode(c);
}
// For GPS2 via SoftwareSerial:
while (SerialGPS2.available() > 0) {
char c = SerialGPS2.read();
gps2.encode(c);
}
// Define a reference location (London in this example).
static const double LONDON_LAT = 51.508131, LONDON_LON = -0.128002;
// We'll decide which GPS to display.
// Priority: If one has valid location and the other doesn't, choose the valid one.
// If both are valid, choose the one with a lower "age" (i.e. more recent fix).
bool valid1 = gps1.location.isValid();
bool valid2 = gps2.location.isValid();
TinyGPSPlus *activeGps = nullptr;
if(valid1 && !valid2) {
activeGps = &gps1;
} else if(valid2 && !valid1) {
activeGps = &gps2;
} else if(valid1 && valid2) {
activeGps = (gps1.location.age() <= gps2.location.age()) ? &gps1 : &gps2;
} else {
activeGps = &gps1; // default to gps1 if none valid
}
// Print output using the active GPS data:
printInt(activeGps->satellites.value(), activeGps->satellites.isValid(), 5);
printFloat(activeGps->hdop.hdop(), activeGps->hdop.isValid(), 6, 1);
printFloat(activeGps->location.lat(), activeGps->location.isValid(), 11, 6);
printFloat(activeGps->location.lng(), activeGps->location.isValid(), 12, 6);
printInt(activeGps->location.age(), activeGps->location.isValid(), 5);
printDateTime(activeGps->date, activeGps->time);
printFloat(activeGps->altitude.meters(), activeGps->altitude.isValid(), 7, 2);
printFloat(activeGps->course.deg(), activeGps->course.isValid(), 7, 2);
printFloat(activeGps->speed.kmph(), activeGps->speed.isValid(), 6, 2);
printStr(activeGps->course.isValid() ? TinyGPSPlus::cardinal(activeGps->course.deg()) : "*** ", 6);
unsigned long distanceKmToLondon = (unsigned long)TinyGPSPlus::distanceBetween(
activeGps->location.lat(),
activeGps->location.lng(),
LONDON_LAT, LONDON_LON) / 1000;
printInt(distanceKmToLondon, activeGps->location.isValid(), 9);
double courseToLondon = TinyGPSPlus::courseTo(
activeGps->location.lat(),
activeGps->location.lng(),
LONDON_LAT, LONDON_LON);
printFloat(courseToLondon, activeGps->location.isValid(), 7, 2);
const char *cardinalToLondon = TinyGPSPlus::cardinal(courseToLondon);
printStr(activeGps->location.isValid() ? cardinalToLondon : "*** ", 6);
printInt(activeGps->charsProcessed(), true, 6);
printInt(activeGps->sentencesWithFix(), true, 10);
printInt(activeGps->failedChecksum(), true, 9);
// Print additional column indicating source: "GPS 1" or "GPS 2".
Serial.print(" ");
if(activeGps == &gps1) {
Serial.print("GPS 1");
} else {
Serial.print("GPS 2");
}
Serial.println();
smartDelay(1000);
if (millis() > 5000 && activeGps->charsProcessed() < 10)
Serial.println(F("No GPS data received: check wiring"));
}
// Modified smartDelay() that feeds both GPS streams.
static void smartDelay(unsigned long ms) {
unsigned long start = millis();
do {
while (SerialGPS1.available() > 0)
gps1.encode(SerialGPS1.read());
while (SerialGPS2.available() > 0)
gps2.encode(SerialGPS2.read());
} while (millis() - start < ms);
}
static void printFloat(float val, bool valid, int len, int prec) {
if (!valid) {
while (len-- > 1)
Serial.print('*');
Serial.print(' ');
} else {
Serial.print(val, prec);
int vi = abs((int)val);
int flen = prec + (val < 0.0 ? 2 : 1); // . and -
flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
for (int i = flen; i < len; ++i)
Serial.print(' ');
}
smartDelay(0);
}
static void printInt(unsigned long val, bool valid, int len) {
char sz[32] = "*****************";
if (valid)
sprintf(sz, "%ld", val);
sz[len] = 0;
for (int i = strlen(sz); i < len; ++i)
sz[i] = ' ';
if (len > 0)
sz[len - 1] = ' ';
Serial.print(sz);
smartDelay(0);
}
static void printDateTime(TinyGPSDate &d, TinyGPSTime &t) {
if (!d.isValid()) {
Serial.print(F("********** "));
} else {
char sz[32];
sprintf(sz, "%02d/%02d/%02d ", d.month(), d.day(), d.year());
Serial.print(sz);
}
if (!t.isValid()) {
Serial.print(F("******** "));
} else {
char sz[32];
sprintf(sz, "%02d:%02d:%02d ", t.hour(), t.minute(), t.second());
Serial.print(sz);
}
printInt(d.age(), d.isValid(), 5);
smartDelay(0);
}
static void printStr(const char *str, int len) {
int slen = strlen(str);
for (int i = 0; i < len; ++i)
Serial.print(i < slen ? str[i] : ' ');
smartDelay(0);
}
HTH
GL PJ
This morning ,Rocking a rolling 2 GPS 30+ sats or 15’ish each… LOL
18 0.6 26.041689 -80.220894 403 02/23/2025 15:42:48 769 -6.40 0.00 0.00 N 7108 43.06 NE 13985 37514 1 GPS 2
18 0.6 26.041689 -80.220894 418 02/23/2025 15:42:49 765 -6.30 0.00 0.00 N 7108 43.06 NE 13986 37516 1 GPS 2
18 0.6 26.041689 -80.220894 418 02/23/2025 15:42:50 775 -6.30 0.00 0.00 N 7108 43.06 NE 13987 37518 1 GPS 2
18 0.6 26.041689 -80.220894 426 02/23/2025 15:42:51 780 -6.30 0.00 0.00 N 7108 43.06 NE 13988 37520 1 GPS 2
17 0.6 26.041689 -80.220894 435 02/23/2025 15:42:52 784 -6.30 0.00 0.00 N 7108 43.06 NE 13989 37522 1 GPS 2
17 0.6 26.041689 -80.220894 440 02/23/2025 15:42:53 799 -6.20 0.00 0.00 N 7108 43.06 NE 13989 37524 1 GPS 2
16 0.6 26.041712 -80.220886 433 02/23/2025 15:42:54 799 0.30 241.83 0.00 WSW 7108 43.06 NE 13955 37343 1 GPS 1
17 0.6 26.041691 -80.220894 434 02/23/2025 15:42:55 801 -6.20 0.00 0.00 N 7108 43.06 NE 13991 37528 1 GPS 2
16 0.6 26.041712 -80.220886 443 02/23/2025 15:42:56 806 0.30 241.83 0.00 WSW 7108 43.06 NE 13956 37347 1 GPS 1
16 0.6 26.041691 -80.220894 452 02/23/2025 15:42:57 815 -6.20 0.00 0.00 N 7108 43.06 NE 13993 37532 1 GPS 2
16 0.6 26.041691 -80.220894 457 02/23/2025 15:42:58 814 -6.20 0.00 0.00 N 7108 43.06 NE 13993 37534 1 GPS 2
16 0.6 26.041691 -80.220894 462 02/23/2025 15:42:59 823 -6.20 0.00 0.00 N 7108 43.06 NE 13994 37536 1 GPS 2
15 0.7 26.041712 -80.220886 455 02/23/2025 15:43:00 819 0.20 241.83 0.00 WSW 7108 43.06 NE 13959 37355 1 GPS 1
16 0.6 26.041712 -80.220886 458 02/23/2025 15:43:01 814 0.30 241.83 0.00 WSW 7108 43.06 NE 13960 37357 1 GPS 1
16 0.6 26.041712 -80.220886 464 02/23/2025 15:43:02 810 0.30 241.83 0.00 WSW 7108 43.06 NE 13961 37359 1 GPS 1
16 0.6 26.041712 -80.220886 467 02/23/2025 15:43:03 821 0.30 241.83 0.00 WSW 7108 43.06 NE 13962 37361 1 GPS 1
16 0.6 26.041712 -80.220886 472 02/23/2025 15:43:04 820 0.30 241.83 0.00 WSW 7108 43.06 NE 13963 37363 1 GPS 1
16 0.6 26.041712 -80.220886 468 02/23/2025 15:43:05 829 0.30 241.83 0.00 WSW 7108 43.06 NE 13963 37365 1 GPS 1
16 0.6 26.041712 -80.220886 477 02/23/2025 15:43:06 820 0.30 241.83 0.00 WSW 7108 43.06 NE 13964 37367 1 GPS 1
16 0.6 26.041712 -80.220886 474 02/23/2025 15:43:07 834 0.30 241.83 0.00 WSW 7108 43.06 NE 13965 37369 1 GPS 1
16 0.6 26.041691 -80.220894 484 02/23/2025 15:43:08 846 -6.10 0.00 0.00 N 7108 43.06 NE 14001 37554 1 GPS 2
16 0.6 26.041691 -80.220894 490 02/23/2025 15:43:09 850 -6.10 0.00 0.00 N 7108 43.06 NE 14002 37556 1 GPS 2
16 0.6 26.041691 -80.220894 497 02/23/2025 15:43:10 852 -6.10 0.00 0.00 N 7108 43.06 NE 14003 37558 1 GPS 2
16 0.6 26.041691 -80.220894 499 02/23/2025 15:43:11 864 -6.10 0.00 0.00 N 7108 43.06 NE 14004 37560 1 GPS 2
Hi there,
ROCK SOLID performance from the L76K GSS unit. seems to be a TAD faster and fresher than the Grove connected AIR530 Unit.
I was able to run each device with each method Hardware/Software Serial on either Port.
The key seems to be SoftSerial works better on pins that are already defined as a Uart channel. Hardware Serial can make changes to the interconnected PPI in the chips Peripherals to better support a Brute force or bitbanged io approach to serial comms.
Baud rates also play a role so don’t try to fast at first, test , tune and turn up as needed.
I added the labels and posting current code and output. for others to duplicate.
Serial Output Monitor…
16 0.8 26.041662 -80.220924 224 02/23/2025 20:13:50 224 -11.60 134.26 0.00 SE 12348 16.02 NNE 98018 26178 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 227 02/23/2025 20:13:51 227 -11.50 134.26 0.00 SE 12348 16.02 NNE 98025 26180 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 224 02/23/2025 20:13:52 224 -11.50 134.26 0.00 SE 12348 16.02 NNE 98033 26182 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 233 02/23/2025 20:13:53 233 -11.50 134.26 0.00 SE 12348 16.02 NNE 98040 26184 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 233 02/23/2025 20:13:54 233 -11.50 134.26 0.00 SE 12348 16.02 NNE 98048 26186 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 228 02/23/2025 20:13:55 228 -11.40 134.26 0.00 SE 12348 16.02 NNE 98055 26188 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 231 02/23/2025 20:13:56 231 -11.40 134.26 0.00 SE 12348 16.02 NNE 98063 26190 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 236 02/23/2025 20:13:57 236 -11.40 134.26 0.00 SE 12348 16.02 NNE 98071 26192 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 245 02/23/2025 20:13:58 245 -11.40 134.26 0.00 SE 12348 16.02 NNE 98078 26194 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 251 02/23/2025 20:13:59 251 -11.40 134.26 0.00 SE 12348 16.02 NNE 98086 26196 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 254 02/23/2025 20:14:00 254 -11.40 134.26 0.00 SE 12348 16.02 NNE 98093 26198 0 GPS 2- L76K GSS
16 0.8 26.041662 -80.220924 254 02/23/2025 20:14:01 254 -11.40 134.26 0.00 SE 12348 16.02 NNE 98101 26200 0 GPS 2- L76K GSS
15 1.0 26.041656 -80.220879 247 02/23/2025 20:14:02 247 -5.50 308.12 2.76 NW 12348 16.02 NNE 96082 26202 0 GPS 1- Air530
15 1.0 26.041656 -80.220879 268 02/23/2025 20:14:03 268 -5.50 308.12 0.00 NW 12348 16.02 NNE 96089 26204 0 GPS 1- Air530
15 1.0 26.041656 -80.220879 267 02/23/2025 20:14:04 267 -5.50 308.12 0.00 NW 12348 16.02 NNE 96097 26206 0 GPS 1- Air530
15 1.0 26.041656 -80.220879 267 02/23/2025 20:14:05 267 -5.50 308.12 0.00 NW 12348 16.02 NNE 96104 26208 0 GPS 1- Air530
15 0.8 26.041662 -80.220924 277 02/23/2025 20:14:06 277 -11.40 134.26 0.00 SE 12348 16.02 NNE 98139 26210 0 GPS 2- L76K GSS
15 1.0 26.041656 -80.220879 279 02/23/2025 20:14:07 279 -5.20 308.12 0.54 NW 12348 16.02 NNE 96119 26212 0 GPS 1- Air530
15 0.8 26.041662 -80.220924 290 02/23/2025 20:14:08 290 -11.40 134.26 0.00 SE 12348 16.02 NNE 98154 26214 0 GPS 2- L76K GSS
15 0.8 26.041662 -80.220924 295 02/23/2025 20:14:09 295 -11.40 134.26 0.00 SE 12348 16.02 NNE 98161 26216 0 GPS 2- L76K GSS
15 0.8 26.041662 -80.220924 293 02/23/2025 20:14:10 293 -11.40 134.26 0.00 SE 12348 16.02 NNE 98169 26218 0 GPS 2- L76K GSS
15 0.8 26.041662 -80.220924 301 02/23/2025 20:14:11 301 -11.40 134.26 0.00 SE 12348 16.02 NNE 98177 26220 0 GPS 2- L76K GSS
15 0.8 26.041662 -80.220924 303 02/23/2025 20:14:12 303 -11.40 134.26 0.00 SE 12348 16.02 NNE 98184 26222 0 GPS 2- L76K GSS
15 0.8
Scroll right to the end. 
FQBN: esp32:esp32:XIAO_ESP32C3
Using board 'XIAO_ESP32C3' from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.7
Using core 'esp32' from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.7
**EDIT... for brevity...**
Using library TinyGPSPlus at version 1.0.3 in folder: D:\Arduino_projects\libraries\TinyGPSPlus
Using library EspSoftwareSerial at version 8.1.0 in folder: D:\Arduino_projects\libraries\EspSoftwareSerial
"C:\\Users\\Dude\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\esp-rv32\\2302/bin/riscv32-esp-elf-size" -A "C:\\Users\\Dude\\AppData\\Local\\arduino\\sketches\\C46D996DDDD904C0FBA2B540A6CCB432/sketch_feb23f_Posted_3_Serial_portsC3.ino.elf"
Sketch uses 284502 bytes (21%) of program storage space. Maximum is 1310720 bytes.
Global variables use 12700 bytes (3%) of dynamic memory, leaving 314980 bytes for local variables. Maximum is 327680 bytes.
"C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\4.6/esptool.exe" --chip esp32c3 --port "COM28" --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode keep --flash_freq keep --flash_size keep 0x0 "C:\Users\Dude\AppData\Local\arduino\sketches\C46D996DDDD904C0FBA2B540A6CCB432/sketch_feb23f_Posted_3_Serial_portsC3.ino.bootloader.bin" 0x8000 "C:\Users\Dude\AppData\Local\arduino\sketches\C46D996DDDD904C0FBA2B540A6CCB432/sketch_feb23f_Posted_3_Serial_portsC3.ino.partitions.bin" 0xe000 "C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.7/tools/partitions/boot_app0.bin" 0x10000 "C:\Users\Dude\AppData\Local\arduino\sketches\C46D996DDDD904C0FBA2B540A6CCB432/sketch_feb23f_Posted_3_Serial_portsC3.ino.bin"
esptool.py v4.6
Serial port COM28
Connecting...
Chip is ESP32-C3 (revision v0.3)
Features: WiFi, BLE
Crystal is 40MHz
MAC: a0:76:4e:40:08:ec
Uploading stub...
Running stub...
Stub running...
Code running as Posted…
// This is a 3 serial port demo using GPS units from Seeed, 2 GPS setup with ESP32C3
// Hardware Serial & Software Serial are implimented.
// Compiled with BSP 3.0.7
// added a column at the end for which GPS unit is sending the data
// tested with AIR530 V1.0 & L76K GNSS Seeed Xiao GPS unit.
// Either unit can be used in either Port position.
// See the Seeed Support form for pictures and errata.
#include <TinyGPSPlus.h>
#include <SoftwareSerial.h>
#include <HardwareSerial.h>
// ------------------ GPS Configurations ------------------
// For GPS 1 (HardwareSerial on UART1)
const int gps1RXPin = 9; // Connect GPS1 TX to ESP32 RX (pin 7) AIR530 Grove GPS
const int gps1TXPin = 10; // Connect GPS1 RX to ESP32 TX (pin 6)
const uint32_t gps1Baud = 9600;
// For GPS 2 (SoftwareSerial)
const int gps2RXPin = D7; // Connect GPS2 TX to ESP32 RX (pin 9) L76K GNSS SEEED Studio
const int gps2TXPin = D6; // Connect GPS2 RX to ESP32 TX (pin 10)
const uint32_t gps2Baud = 9600;
// ------------------ Objects ------------------
TinyGPSPlus gps1; // For HardwareSerial GPS
TinyGPSPlus gps2; // For SoftwareSerial GPS
// Use UART1 for GPS 1:
HardwareSerial SerialGPS1(1);
// Use SoftwareSerial for GPS 2:
SoftwareSerial SerialGPS2(gps2RXPin, gps2TXPin); // (RX, TX)
// ------------------ Function Prototypes ------------------
static void smartDelay(unsigned long ms);
static void printFloat(float val, bool valid, int len, int prec);
static void printInt(unsigned long val, bool valid, int len);
static void printDateTime(TinyGPSDate &d, TinyGPSTime &t);
static void printStr(const char *str, int len);
static void printGPSSource();
void setup() {
Serial.begin(9600);
delay(2000);
Serial.println("\nFullExample.ino");
Serial.println("An extensive example of many interesting TinyGPSPlus features");
Serial.print("Testing TinyGPSPlus library v. ");
Serial.println(TinyGPSPlus::libraryVersion());
Serial.println("by Mikal Hart, tweaked for 2 GPS by PJG");
Serial.println();
Serial.println("Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum GPS");
Serial.println(" (deg) (deg) Age Age (m) --- from GPS ---- ---- to London ---- RX RX Fail");
Serial.println("----------------------------------------------------------------------------------------------------------------------------------------");
// Initialize GPS 1 (HardwareSerial) on UART1 with assigned pins.
SerialGPS1.begin(gps1Baud, SERIAL_8N1, gps1RXPin, gps1TXPin);
Serial.println("GPS-1 HardwareSerial initialized on pins 6 (RX) and 7 (TX).");
// Initialize GPS 2 (SoftwareSerial) on pins 9 & 10.
SerialGPS2.begin(gps2Baud);
Serial.println("GPS-2 SoftwareSerial initialized on pins 9 (RX) and 10 (TX).");
Serial.println();
}
void loop() {
// Process incoming GPS data for both GPS units.
// For GPS1 via HardwareSerial:
while (SerialGPS1.available() > 0) {
char c = SerialGPS1.read();
gps1.encode(c);
}
// For GPS2 via SoftwareSerial:
while (SerialGPS2.available() > 0) {
char c = SerialGPS2.read();
gps2.encode(c);
}
// Define a reference location (London in this example).
//static const double LONDON_LAT = 51.508131, LONDON_LON = -0.128002;
static const double PITTSBURGH_LAT = 40.4406, PITTSBURGH_LON = 79.9959;
// We'll decide which GPS to display.
// Priority: If one has valid location and the other doesn't, choose the valid one.
// If both are valid, choose the one with a lower "age" (i.e. more recent fix).
bool valid1 = gps1.location.isValid();
bool valid2 = gps2.location.isValid();
TinyGPSPlus *activeGps = nullptr;
if(valid1 && !valid2) {
activeGps = &gps1;
} else if(valid2 && !valid1) {
activeGps = &gps2;
} else if(valid1 && valid2) {
activeGps = (gps1.location.age() <= gps2.location.age()) ? &gps1 : &gps2;
} else {
activeGps = &gps1; // default to gps1 if none valid
}
// Print output using the active GPS data:
printInt(activeGps->satellites.value(), activeGps->satellites.isValid(), 5);
printFloat(activeGps->hdop.hdop(), activeGps->hdop.isValid(), 6, 1);
printFloat(activeGps->location.lat(), activeGps->location.isValid(), 11, 6);
printFloat(activeGps->location.lng(), activeGps->location.isValid(), 12, 6);
printInt(activeGps->location.age(), activeGps->location.isValid(), 5);
printDateTime(activeGps->date, activeGps->time);
printFloat(activeGps->altitude.meters(), activeGps->altitude.isValid(), 7, 2);
printFloat(activeGps->course.deg(), activeGps->course.isValid(), 7, 2);
printFloat(activeGps->speed.kmph(), activeGps->speed.isValid(), 6, 2);
printStr(activeGps->course.isValid() ? TinyGPSPlus::cardinal(activeGps->course.deg()) : "*** ", 6);
unsigned long distanceKmToLondon = (unsigned long)TinyGPSPlus::distanceBetween(
activeGps->location.lat(),
activeGps->location.lng(),
//LONDON_LAT, LONDON_LON) / 1000;
PITTSBURGH_LAT, PITTSBURGH_LON) / 1000 ;
printInt(distanceKmToLondon, activeGps->location.isValid(), 9);
double courseToLondon = TinyGPSPlus::courseTo(
activeGps->location.lat(),
activeGps->location.lng(),
//LONDON_LAT, LONDON_LON);
PITTSBURGH_LAT, PITTSBURGH_LON);
printFloat(courseToLondon, activeGps->location.isValid(), 7, 2);
const char *cardinalToLondon = TinyGPSPlus::cardinal(courseToLondon);
printStr(activeGps->location.isValid() ? cardinalToLondon : "*** ", 6);
printInt(activeGps->charsProcessed(), true, 6);
printInt(activeGps->sentencesWithFix(), true, 10);
printInt(activeGps->failedChecksum(), true, 9);
// Print additional column indicating source: "GPS 1" or "GPS 2".
Serial.print(" ");
if(activeGps == &gps1) {
Serial.print("GPS 1- Air530 ");
} else {
Serial.print("GPS 2- L76K GSS ");
}
Serial.println();
smartDelay(1000);
if (millis() > 5000 && activeGps->charsProcessed() < 10)
Serial.println(F("No GPS data received: check wiring"));
}
// Modified smartDelay() that feeds both GPS streams.
static void smartDelay(unsigned long ms) {
unsigned long start = millis();
do {
while (SerialGPS1.available() > 0)
gps1.encode(SerialGPS1.read());
while (SerialGPS2.available() > 0)
gps2.encode(SerialGPS2.read());
} while (millis() - start < ms);
}
static void printFloat(float val, bool valid, int len, int prec) {
if (!valid) {
while (len-- > 1)
Serial.print('*');
Serial.print(' ');
} else {
Serial.print(val, prec);
int vi = abs((int)val);
int flen = prec + (val < 0.0 ? 2 : 1); // . and -
flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
for (int i = flen; i < len; ++i)
Serial.print(' ');
}
smartDelay(0);
}
static void printInt(unsigned long val, bool valid, int len) {
char sz[32] = "*****************";
if (valid)
sprintf(sz, "%ld", val);
sz[len] = 0;
for (int i = strlen(sz); i < len; ++i)
sz[i] = ' ';
if (len > 0)
sz[len - 1] = ' ';
Serial.print(sz);
smartDelay(0);
}
static void printDateTime(TinyGPSDate &d, TinyGPSTime &t) {
if (!d.isValid()) {
Serial.print(F("********** "));
} else {
char sz[32];
sprintf(sz, "%02d/%02d/%02d ", d.month(), d.day(), d.year());
Serial.print(sz);
}
if (!t.isValid()) {
Serial.print(F("******** "));
} else {
char sz[32];
sprintf(sz, "%02d:%02d:%02d ", t.hour(), t.minute(), t.second());
Serial.print(sz);
}
printInt(d.age(), d.isValid(), 5);
smartDelay(0);
}
static void printStr(const char *str, int len) {
int slen = strlen(str);
for (int i = 0; i < len; ++i)
Serial.print(i < slen ? str[i] : ' ');
smartDelay(0);
}
HTH
GL PJ
Xiao ESP32C3 is All you neeed 
thanks… I think one of my gps battery must be dead or something loosing the alminac … but i am definatly going to use this… I was with ,y cousin today playing with lora transmitters
if its not too much trouble can you add a way to toggle between gps units for the printing… maybe a serial command 1 or 2
or maybe to get it to display both?
