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Libraries \ NMEA

Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Class | NMEA
Name |

### gprmc_speed()

Examples |
    #include <nmea.h>

    // create a GPS data connection to GPRMC sentence type
    NMEA gps(GPRMC);

    void setup() {
      Serial1.begin(4800);
      pinMode(8, OUTPUT);
    }

    void loop() {
      if (Serial1.available() > 0 ) {
        // read incoming character from GPS
        char c = Serial1.read();

        // check if the character completes a valid GPS sentence
        if (gps.decode(c)) {
          // check if GPS positioning was active
          if (gps.gprmc_status() == 'A') {
            // read speed in kilometers-per-hour and set led accordingly
            if (gps.gprmc_speed(KMPH) > 50.0) {
              digitalWrite(8, HIGH);
            } else {
              digitalWrite(8, LOW);
            }
          }
        }
      }
    }
Description | Returns speed-over-ground of GPS. To get the speed in kilometers-per-hour, use gprmc_speed(KMPH). Possible units of speed are KMPH for kilometers-per-hour, MPS for meters-per-second, MPH for miles-per-hour, and KTS for Knots.
Syntax |
    gprmc_speed(unit)
Parameters |

unit | KMPH, MPS, MPH, or KTS

Returns | float
Usage | Application

Updated on July 07, 2011 11:11:11pm PDT