Using the Garmin 16x HVS GPS with Arduino

Question

I want to use a Garmin 16x HVS gps receiver with a Leonardo Arduino board. Basically I would solder a db9 connector to the serial comport input and output. I want to control the output from the gps receiver. I want to compare the most recent gps string with the one before and if the position has not change by 50 feet(programmeable 0 to 100 feet) the gps string would not be sent through the output serial port. How would I code this?

screamingtiger · Answer

So I assume you know how to hook it up to the GPS.

Please see TinyGPS++ for Arduino.

https://github.com/mikalhart/TinyGPSPlus/releases/tag/v0.94b

Inside you will find examples on how to read from the serial, using such things as Serial.begin(9600) or the baud rate you want to use.

The NMEA sentences are parsed for you, and it gives you coordinates and other information. You can check a flag when each time the coordinates are updated. There is a function called "DistanceBetween" that takes two set of coordinates and computes the distance between them using an arclength method, which they refer to as the "Great Circle Problem".

There are also a set of NMEA commands you can send that GPS. Please see http://www.gpsinformation.org/dale/nmea.htm for more information. The hard part will just be determining what baud rate it defaults to.

Go have a look and come back if you want more examples. If you like my answer, please mark it helpful and/or correct.

Thanks!