somone help plz!

Van Dessel

Ok, i'm at the verge of insanity!! I wrote a few posts asking how to get my pmb-248 gps to work propely which it finally did. I was able to get Degrees and Minutes onto a flash drive with a·parallax datalogger however I can't get my coordinates down to seconds! I've searched the forums, went through google and found nothing . Somone please help me! Its probably an obvious mistake that a only a newbie like me can make. Any help appreciacted.

USB.OpenForWrite(string("data.txt"))    'Writes to the data.txt file and records the coordinates
        USB.WriteLine(string("longitude is..."))
        
        Usb.Write(num.ToStr(atoi(gps.longitude,3),Num#DEC3))  
        USB.Write(string("."))                                      
        USB.write(num.ToStr(((atoi(gps.longitude+3,2))),Num#DEC3))        '
        Usb.Write(string("."))
        USB.write(num.ToStr((atoi(gps.longitude+5,4)),Num#DEC5))
        USB.Close(string("data.txt"))   
       

w8an

Could it be that your GPS unit is supplying DDD.dddddd? Degrees only, using fractional degrees to indicate minutes and seconds?

Or DD MM.mmmm ??

Van Dessel

I believe that it is supplying DD MM.mmmm Heres a sampe from the . txt file:

longitude is...
71. 43. 0000

longitude is...
71. 43. 0000

All I get are zeroes for the .mmmm

MagIO2

What I don't understand, atoi converts a string to an integer and then you convert it back to a string again, right?!

Why don't you simply print out substrings?

You should provide the code (use the propeller tool archieve function and attach it to your post). Then we can have a look at everything. Most times the problems are hidden somewhere else and not in the snippet posted here.

w8an

Can you give us an example of what the value of gps.longitude looks like before the atoi and ToStr methods are applied to it?

Does this value contain all the information you want to extract?

I'm not sure if your GPS is supplying USB or RS-232 data. Have you hooked it to a PC and monitored the data stream to ensure it is sending what you expect?

Cluso99

GPS normally output in text strings according to NMEA definitions. BTW, you have shown the same for lat & lon which is highly unusual. You should also have E/W and N/S

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