GPS Receiver Module

GPS receivers are generally used in smartphones, fleet management system, military etc. for tracking or finding location. Global Positioning System (GPS) is a satellite-based system that uses satellites and ground stations to measure and compute its position on Earth.GPS is also known as Navigation System with Time and Ranging (NAVSTAR) GPS.

GPS receiver module gives output in standard (National Marine Electronics Association) NMEA string format. It provides output serially on Tx pin with default 9600 Baud rate.

This NMEA string output from GPS receiver contains different parameters separated by commas like longitude, latitude, altitude, time etc. Each string starts with ‘$’ and ends with carriage return/line feed sequence.

E.g. 

$GPGGA, 184241.000, 1829.9639,N, 07347.6174, E, 1, 05, 2.1, 607.1, M,-64.7, M, ,0000*7C

 

gps module

Pin Description of GPS Module

  • VCC: Power Supply 3.3 – 6 V
  • GND: Ground
  • TX: Transmit data serially which gives information about location, time etc.
  • RX: Receive Data serially. It is required when we want to configure GPS module.

Check GPS receiver module

After connection GPS receiver open any serial moniter at 9600 baud rate. The terminal will show data coming from GPS receiver module.

E.g. $GPGGA, 184241.000, 1829.9639,N, 07347.6174, E, 1, 05, 2.1, 607.1, M,-64.7, M, ,0000*7C

In the above string, the NMEA string starting with “$GPGGA” is most popularly used. It provides us Time, Longitude, Latitude and Altitude along with directions. This information is helpful to find Time and Location.

Name Example Units Description
Message ID $GPGGA GGA Protocol Header
UTC Time 184241.000 hhmmss.sss
Latitude 1829.9639 ddmm.mmmm
N/S Indicator N N=North, S=South
Longitude 07347.6174 dddmm.mmmm
E/W Indicator E E=East, W=West
Position Fix Indicator 1 Fix GPS SPS mode
Satellites Used 05 Range 0 to 12
HDOP 2.1 Horizontal Dilution of Precision
MSL Altitude 607.1 Meters Mean Sea Level
Units M Meters
Geoid Separation 64.7 Meters
Units M Meters
Age of Diff. Corr. - Null field if DGPS is not used
Diff. Ref Station ID 0000
Checksum *7C
Carriage return Line Feed <CR><LF> End of message transmission

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