GPS L80-M39 no satellites

Projects Programming
1

I have connected an L80-M39 to my ESP32. I think i can communicate correctly with the GPS module but whatever i do, it cannot get any satellite information.

This is the raw result:

$GPRMC,000528.800,V,,,,,0.00,0.00,050180,,,N*46
$GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32
$GPGGA,000528.800,,,,,0,0,,,M,,M,,*4F
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,1,1,00*79
$GPGLL,,,,,000528.800,V,N*7D
$GPTXT,01,01,02,ANTSTATUS=OPEN*2B

This is the code i am using:

#include <TinyGPS++.h>                           //get library here > http://arduiniana.org/libraries/tinygpsplus/
TinyGPSPlus gps;                                 //create the TinyGPS++ object

void setup()
{
  Serial.begin(115200);                       //setup Serial monitor ouput
  Serial1.begin(9600, SERIAL_8N1, 13, 12);    //start Serial for GPS at defined baud rate
}

float GPSLat;                                     //Latitude from GPS
float GPSLon;                                     //Longitude from GPS
float GPSAlt;                                     //Altitude from GPS
uint8_t GPSSats;                                  //number of GPS satellites in use
uint32_t GPSHdop;                                 //HDOP from GPS
uint32_t GPSstarttimemS;                          //time in mS when GPS is scanned fo fix
uint32_t GPSendtimemS;                            //time in mS when GPS got a fix


void loop()
{
  gpsWaitFix();
  displayGPSfix();

  Serial.println("");
}


void gpsWaitFix()
{
  //waits till the GPS gets an updated fix

  uint8_t GPSchar;

  Serial.println(F("Wait for updated GPS Fix"));
  GPSstarttimemS = millis();

  while (1)
  {
    if (Serial1.available() > 0)
    {
      GPSchar = Serial1.read();
      gps.encode(GPSchar);
      Serial.write(GPSchar);
    }

    if (gps.location.isUpdated() && gps.altitude.isUpdated())
    {
      GPSendtimemS = millis();
      break;
    }
  }
}


void displayGPSfix()
{
  float tempfloat;

  Serial.println();
  Serial.println();
  Serial.print(F("New GPS Fix "));
  Serial.print(GPSendtimemS - GPSstarttimemS);
  Serial.print(F("mS  "));

  GPSLat = gps.location.lat();
  GPSLon = gps.location.lng();
  GPSAlt = gps.altitude.meters();
  GPSSats = gps.satellites.value();
  GPSHdop = gps.hdop.value();
  tempfloat = ( (float) GPSHdop / 100);

  Serial.print(F("Lat,"));
  Serial.print(GPSLat, 6);
  Serial.print(F(",Lon,"));
  Serial.print(GPSLon, 6);
  Serial.print(F(",Alt,"));
  Serial.print(GPSAlt, 1);
  Serial.print(F("m,Sats,"));
  Serial.print(GPSSats);
  Serial.print(F(",HDOP,"));
  Serial.print(tempfloat, 2);

  Serial.println();
  Serial.println();
}

I assume the communication is okay since i do get results from the gps module?

The module is put in front of the window with the label up

2

Can the GPS receiver also see GPS satellites or only the ceiling of the room?

3

I don't know exactly how the view is, but does it need to exactly see the sky? The module eventually will be installed in a motorhome but under the roof. Will this work?

4

Check it simply.

5

I don't understand why it works so bad. After half an our I was able to get 3 or 4 satellites but the GPS modules needed to be sticked to the window of the house.

In the motorhome is already a cheap GPS tracker built in which is not located close to a window and it does get GPS really quickly.

Now after restarting and waiting for 15 minutes already, it still has no gps signal and still 0 satellites found

6

Still struggling to get signal. I have placed the module outside with the top up and it does get time but still 0 satellites

7

I tested a Quectel L80 back in 2020, nice compact, good performing GPS.

Outside in my garden with a view of the sky it got a fix from cold in 40 seconds, which is as expected really.

8

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