Hello, Monday, November 24, 2008, 1:08:45, Peter Putnam wrote:
P> Greetings, P> For those interested in a very simple means of determining if the NMEA P> data stream from a GPS receiver contains valid fix data, I offer P> design details for a "Valid Fix" detector that runs in a Microchip P> 12F629, an 8-pin DIP device. P> No other components are required if the GPS receiver provides CMOS P> output levels: P> http://www.ni6e.com/time/GPS_Valid_Fix.html P> Regards, P> Peter Looks like your firmware will need some correction, as there is a lot of NMEA variations... Below is examples of GPRMC sentences from several different GPS receivers. You'll need to pick character after second comma, not by particular offset, to be compatible. uBlox LEA4A (firmware 4): $GPRMC,214541.00,A,5558.55936,N,03709.54595,E,1.116,104.33,120107,,,A*6A Trimble Pathfinder Pro XR $GPRMC,050945.00,A,3504.227794,N,13545.810149,E,000.0,57.1,140302,6.5,W,A*12 Garmin GPS III Plus $GPRMC,031655,A,3404.456,N,13531.788,E,000.0,360.0,110101,006.8,W*6D Garmin GPSMAP 76S $GPRMC,040014,A,4242.0410,N,14134.2795,E,1.4,51.0,010802,8.0,W,A*35 Blue Logger GPS (Something from Japan) $GPRMC,021803.751,A,3501.5666,N,13546.9457,E,0.00,212.31,110604,,*07 uBlox SBR-LS (firmware 3.01) $GPRMC,051250.00,A,5558.55523,N,03709.54211,E,1.177,229.34,080705,,,A*6E GlobalSat BT-338 (SiRF) $GPRMC,100643.000,A,5522.9036,N,03710.1282,E,0.16,119.11,200507,,*0D -- Best regards, Yuri mailto:[EMAIL PROTECTED] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
