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Topic: GPS EM-406 example (Read 23782 times) previous topic - next topic


hmm does anyone successfully got a GPS running over the
SoftSerial Port?



I have an Arduino - Duemilanove 328, I connect the GSM / GPRS Module - SM5100B and GPS Shield with EM-406A.
Shield calls connect to each TX (1) and RX (0). How do I connect power and functioning properly.
Hector Albornoz


Jan 13, 2011, 02:14 am Last Edit: Jan 13, 2011, 02:18 am by mikecurry74 Reason: 1
had garbled output like everyone else... but now...

Acquired Data
Lat/Long(10^-5 deg): 4312611, -8029204 Fix age: 298ms.
Lat/Long(float): 43.12611, -80.29204 Fix age: 415ms.
Date(ddmmyy): 130111 Time(hhmmsscc): 1090400 Fix age: 544ms.
Date: 1/13/2011  Time: 1:9:4.0  Fix age: 648ms.
Alt(cm): 22040 Course(10^-2 deg): 27382 Speed(10^-2 knots): 37
Alt(float): 220.40 Course(float): 273.82
Speed(knots): 0.37 (mph): 0.43 (mps): 0.19 (kmph): 0.69
Stats: characters: 5699 sentences: 41 failed checksum: 4

Problem was that data was INVERTED...

do this:
NewSoftSerial nss(2, 3, true);

Here is my modified code:

Code: [Select]
#include <NewSoftSerial.h>
#include <TinyGPS.h>

/* This sample code demonstrates the normal use of a TinyGPS object.
  It requires the use of NewSoftSerial, and assumes that you have a
  4800-baud serial GPS device hooked up on pins 2(rx) and 3(tx).

TinyGPS gps;
NewSoftSerial nss(2, 3, true); // my gps data is inverted!!

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

void setup()
 Serial.print("Testing TinyGPS library v. "); Serial.println(TinyGPS::library_version());
 Serial.println("by Mikal Hart");
 Serial.print("Sizeof(gpsobject) = "); Serial.println(sizeof(TinyGPS));

void loop()
 bool newdata = false;
 unsigned long start = millis();

 // Every 5 seconds we print an update
 while (millis() - start < 5000)
   if (feedgps())
     newdata = true;
 if (newdata)
   Serial.println("Acquired Data");

void printFloat(double number, int digits)
 // Handle negative numbers
 if (number < 0.0)
    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;

 // Print the decimal point, but only if there are digits beyond
 if (digits > 0)

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

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.");
 feedgps(); // If we don't feed the gps during this long routine, we may drop characters and get checksum errors

 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);
bool feedgps()
 while (nss.available())
   if (gps.encode(nss.read()))
     return true;
 return false;


Problem was that data was INVERTED...

do this:
NewSoftSerial nss(2, 3, true);

This is not the solution to everybody. Apparently the EM-406 needs not to be inverted. Mine and lots of others with this module have them work fine.
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter

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