problem with gps + arduino Uno

Projects Programming
1

I've got problem with reading data from gps. I wrote a simple program:

#include <SoftwareSerial.h>

int rxPin = 2;
int txPin = 3;
SoftwareSerial gpsSerial =  SoftwareSerial(rxPin, txPin);

void setup()
{
 pinMode(rxPin, INPUT);
 pinMode(txPin, OUTPUT);
 Serial.begin(9600);
 gpsSerial.begin(38400);
}

void loop()
{
 char c;
 while (gpsSerial.available())
 {
   c = gpsSerial.read();
   Serial.println(c);
 }
}

but I only get trash, does anybody know why?

2

but I only get trash,

Because you have a speed mismatch?
Because you have no inversion on your level converters?
Because you've not given us enough to go on.

3

GPS Venus 3.3

Ok, I changed the speed.
What do you mean with:

Because you have no inversion on your level converters?

4

Because you have no inversion on your level converters?

Because you didn't tell us what GPS unit you were using, I assumed it had RS232 levels, but now you've told us the one you're using, I can see that you don't need level conversion and inversion.

Which probably leaves speed mismatch.
What is the default line speed for the device?

5

It's 9600

6

What is the default line speed for the device?

Module outputs the standard NMEA-0183 or SkyTraq Binary sentences at a default rate of 9600bps (adjustable to 115200bps).

Which is not, of course, compatible with:

 gpsSerial.begin(38400);

The GPS is not a MIDI device, so why are you trying to talk to it like it is?

7

I've changed already this line on:

gpsSerial.begin(9600);

Is it possible to receive correct data using this short program?

8

So why are you talking to it at 38.4k?

9

Is it possible to receive correct data using this short program?

Certainly should be. But, you have not provided any proof that you are not getting correct data.

10

38.4k??

11 
gpsSerial.begin(38400);

Yes!

12

I get this:

xþ

13

I get this:

Now, provide some proof that the Arduino is talking to the serial monitor correctly. Put a Serial.print() statement in setup(), and make sure that that statement results in valid output on the serial monitor.

14

i did it and i get "ok" on serial monitor plus some characters

 Serial.print("ok");
15 
Serial.println(c, HEX);
16

I use

Serial.println(c, HEX);

and I get

ok
78
FFFFFFFE
0
FFFFFFE0
FFFFFF80
78
0
0
FFFFFF80
FFFFFF80
FFFFFFF8
FFFFFF80
78

how convert or read it to NMEA data? I assumed that there are correct data