NEO 6M GPS SPEED

Hi,

I am doing a project using NEO 6M GPS with my arduino lilypad.
I programmed it already, and it's working well except of the speed. I get stuck on fixing this, I wonder why the value is never getting zero although I am not moving to my place.

I need any suggestions/help that would make the speed working accurately.

Thanks.

I need any suggestions/help that would make the speed working accurately.

Fix your code.

If you need help, you need to post it, along with any serial output you are getting.

@PaulS

This is the code:

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


SoftwareSerial mySerial(4, 3); // RX, TX
TinyGPS gps;

void gpsdump(TinyGPS &gps);
void printFloat(double f, int digits = 2);

void setup()  
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  
  

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  
  delay(1000);

  Serial.print("Sizeof(gpsobject) = "); Serial.println(sizeof(TinyGPS));
  Serial.println();
  
}

void loop() // run over and over
{
  bool newdata = false;
  unsigned long start = millis();

  // Every 5 seconds we print an update
  while (millis() - start < 5000) {
    if (mySerial.available()) {
      char c = mySerial.read();
      // Serial.print(c);  // uncomment to see raw GPS data
      if (gps.encode(c)) {
        newdata = true;
        // break;  // uncomment to print new data immediately!
      }
    }
  }
  
  if (newdata) {
    Serial.println("Acquired Data");
    Serial.println("-------------");
    gpsdump(gps);
    Serial.println("-------------");
    Serial.println();
  }
  
}

void gpsdump(TinyGPS &gps)
{
  long lat, lon;
  float flat, flon;
  unsigned long age, date, time, chars;
  int year;
  byte month, day, hour, minute, second, hundredths;
  unsigned short sentences, failed;

  gps.get_position(&lat, &lon, &age);
  Serial.print("Lat/Long(10^-5 deg): ");
  Serial.print(lat); 
  Serial.print(", ");
  Serial.print(lon); 
  Serial.print(" Fix age: ");
  Serial.print(age);
  Serial.println("ms.");
  
  // On Arduino, GPS characters may be lost during lengthy Serial.print()
  // On Teensy, Serial prints to USB, which has large output buffering and
  //   runs very fast, so it's not necessary to worry about missing 4800
  //   baud GPS characters.

  gps.f_get_position(&flat, &flon, &age);
  Serial.print("Lat/Long(float): ");
  printFloat(flat, 5); 
  Serial.print(", "); 
  printFloat(flon, 5);
  Serial.print(" Fix age: ");
  Serial.print(age);
  Serial.println("ms.");

  gps.get_datetime(&date, &time, &age);
  Serial.print("Date(ddmmyy): "); 
  Serial.print(date);
  Serial.print(" Time(hhmmsscc): ");
  Serial.print(time);
  Serial.print(" Fix age: "); 
  Serial.print(age); 
  Serial.println("ms.");

  /*gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
  Serial.print("Date: "); 
  Serial.print(static_cast<int>(month)); 
  Serial.print("/"); 
  Serial.print(static_cast<int>(day));
  Serial.print("/"); Serial.print(year);
  Serial.print("  Time: "); 
  Serial.print(static_cast<int>(hour)); 
  Serial.print(":"); 
  Serial.print(static_cast<int>(minute)); 
  Serial.print(":"); 
  Serial.print(static_cast<int>(second));
  Serial.print(".");
  Serial.print(static_cast<int>(hundredths));
  Serial.print("  Fix age: "); 
  Serial.print(age); Serial.println("ms.");*/

  Serial.print("Alt(cm): "); 
  Serial.print(gps.altitude());
  Serial.print(" Course(10^-2 deg): ");
  Serial.print(gps.course()); 
  Serial.print(" Speed(10^-2 knots): ");
  Serial.println(gps.speed());
  Serial.print("Alt(float): ");
  printFloat(gps.f_altitude()); 
  Serial.print(" Course(float): ");
  printFloat(gps.f_course()); 
  Serial.println();
  Serial.print("Speed(knots): ");
  printFloat(gps.f_speed_knots()); 
  Serial.print(" (mph): ");
  printFloat(gps.f_speed_mph());
  Serial.print(" (mps): "); 
  printFloat(gps.f_speed_mps());
  Serial.print(" (kmph): ");
  printFloat(gps.f_speed_kmph());
  Serial.println();

  gps.stats(&chars, &sentences, &failed);
  Serial.print("Stats: characters: "); 
  Serial.print(chars);
  Serial.print(" sentences: ");
  Serial.print(sentences);
  Serial.print(" failed checksum: "); 
  Serial.println(failed);
}

void printFloat(double number, int digits)
{
  // Handle negative numbers
  if (number < 0.0) {
     Serial.print('-');
     number = -number;
  }

  // Round correctly so that print(1.999, 2) prints as "2.00"
  double rounding = 0.5;
  for (uint8_t i=0; i<digits; ++i)
    rounding /= 10.0;
  
  number += rounding;

  // Extract the integer part of the number and print it
  unsigned long int_part = (unsigned long)number;
  double remainder = number - (double)int_part;
  Serial.print(int_part);

  // Print the decimal point, but only if there are digits beyond
  if (digits > 0)
    Serial.print("."); 

  // Extract digits from the remainder one at a time
  while (digits-- > 0) {
    remainder *= 10.0;
    int toPrint = int(remainder);
    Serial.print(toPrint);
    remainder -= toPrint;
  }}