Parallax GPS module with SX/B

Ben_08

I have some questions about parsing out some data from the Parallax GPS module string. For testing purposes i am currently only worried about obtaining the speed parameter from the ASCII string. I need some help with writing the code for parsing speed out of the string. Any suggestions would be beneficial.

Chet

The manual gives example programs to get the speed (and other) information. Download it at : http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/GPSManualV1.1.pdf

This is the a snip that gets it: (BS2 version - debug has to be replaced with a serial out...)

Get_Speed:
SEROUT Sio, Baud, [noparse][[/noparse]"!GPS", GetSpeed]
SERIN Sio, Baud, 3000, No_Response, [noparse][[/noparse]speed.HIGHBYTE, speed.LOWBYTE]
DEBUG MoveTo, FieldLen, 15, DEC (speed / 10), ".", DEC1 (speed // 10), " Knots "
' convert speed from knots to MPH
workVal = speed + (speed ** $2699) ' 1 knot = 1.1507771555 MPH
DEBUG " ( ", DEC (workVal / 10), ".", DEC1 (workVal // 10), " MPH ) "
RETURN

There are also several examples in the SX forum.· do a quick search

Regards

Chet

Post Edited (Chet) : 5/1/2009 8:03:11 PM GMT

RS_Jim

Ben
Check out the Nuts and Volts Articles posted on downloads section of Paralax Website. There is an article entitled "Hacking the Parallax GPS" that gives a wealth of information about the Gps and how to parse the NEMA strings.
RS_Jim