TinyGPS no return correct number of satellites used

Projects Programming
1

I am using following code

#include <SoftwareSerial.h>
#include <TinyGPS.h>

TinyGPS gps;
SoftwareSerial ss(2, 3);

void setup()
{
  Serial.begin(9600);
  ss.begin(9600);
}

void loop()
{
  while (ss.available())
  {
    char c = ss.read();
    if (gps.encode(c)) // Did a new valid sentence come in?
    {
      float flat, flon;
      unsigned long age;
      gps.f_get_position(&flat, &flon, &age);
      Serial.print("LAT,LON =");
      Serial.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
      Serial.print(",");
      Serial.print(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
      Serial.print(" SAT=");
      Serial.println(gps.satellites() == TinyGPS::GPS_INVALID_SATELLITES ? 0 : gps.satellites());
      delay(1000);
    }
  }
}

But the data return below

LAT,LON =23.614660,121.318542 SAT=0
LAT,LON =23.614669,121.318511 SAT=0
LAT,LON =23.614669,121.318496 SAT=0
LAT,LON =23.614679,121.318511 SAT=0
LAT,LON =23.614679,121.318511 SAT=0
LAT,LON =23.614679,121.318519 SAT=0

The number always is "0"
And my GPS information from serial port are these :

01:38:04 $GPGSV,3,3,12,17,64,074,23,20,10,041,16,23,21,068,17,28,28,177,1572
01:38:04 $GPGLL,2336.88138,N,12119.11377,E,013804.00,A,A60
01:38:05 $GPRMC,013805.00,A,2336.88071,N,12119.11450,E,2.866,,051214,,,A7F
01:38:05 $GPVTG,,T,,M,2.866,N,5.309,K,A26
01:38:05 $GPGGA,013805.00,2336.88071,N,12119.11450,E,1,08,1.06,30.9,M,17.9,M,,60
01:38:05 $GPGSA,A,3,10,17,06,09,02,28,23,20,,,,,1.87,1.06,1.5408
01:38:05 $GPGSV,3,1,12,02,29,294,15,03,01,039,07,05,19,222,,06,49,342,19*7C
01:38:05 $GPGSV,3,2,12,09,33,101,21,10,74,230,26,12,15,316,18,13,08,178,78
01:38:05 $GPGSV,3,3,12,17,64,074,23,20,10,041,15,23,21,068,17,28,28,177,1571

I use 3 types of GPS to try the code with TinyGPS, TinyGPS++ ...no result !! Any suggestion will be appreciated !!

2

I fed the NMEA strings you posted above into your sketch, replacing the software serial input. Here is what it output:

LAT,LON =23.614679,121.318572 SAT=0
LAT,LON =23.614679,121.318572 SAT=8
LAT,LON =23.614667,121.318572 SAT=8

So something isn't right, but it probably isn't TinyGPS.
Maybe that one second delay.

3

Even I run it more than 1 or 2 hours , the same result !! Going mad ....

4

Do not cross-post. Other thread locked.

5

Sorry, thanks for your pation.

And I find out the reason, share with you...

"Do not use Arduino Board made with CH340 chip" ...... Exchange with an Arduino Uno R3...Everything is ok now.

6

I think that at least part of your problem is the 1000ms delay you have. The GPS is sending hundreds of bytes of data but after the first sentence is complete you print what you have and then wait for 1 second. During that time the rest of the data arrives and the RX buffer overflows.

You need to process that data, not just sit in a delay loop. If you're not going to process it as it arrives you need a bigger buffer for it.