83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
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Reading two altitudes - Mean Sea Level and Ellipsode
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By: Nathan Seidle
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SparkFun Electronics
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Date: January 3rd, 2019
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License: MIT. See license file for more information but you can
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basically do whatever you want with this code.
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This example shows how to query a Ublox module for its lat/long/altitude.
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getAltitude() reports mm above ellipsode model of the globe. There are some
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instances where altitude above Mean Sea Level is better. This example shows how
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to use getAltitudeMSL(). The difference varies but is ~20m.
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Ellipsoid model: https://www.esri.com/news/arcuser/0703/geoid1of3.html
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Difference between Ellipsoid Model and Mean Sea Level: https://eos-gnss.com/elevation-for-beginners/
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Leave NMEA parsing behind. Now you can simply ask the module for the datums you want!
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Feel like supporting open source hardware?
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Buy a board from SparkFun!
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ZED-F9P RTK2: https://www.sparkfun.com/products/15136
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NEO-M8P RTK: https://www.sparkfun.com/products/15005
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SAM-M8Q: https://www.sparkfun.com/products/15106
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Hardware Connections:
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Plug a Qwiic cable into the GPS and a BlackBoard
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If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
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Open the serial monitor at 115200 baud to see the output
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*/
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#include <Wire.h> //Needed for I2C to GPS
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#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_u-blox_GNSS
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SFE_UBLOX_GPS myGPS;
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long lastTime = 0; //Tracks the passing of 2000ms (2 seconds)
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void setup()
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{
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Serial.begin(115200);
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while (!Serial); //Wait for user to open terminal
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Serial.println("SparkFun Ublox Example");
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Wire.begin();
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if (myGPS.begin() == false) //Connect to the Ublox module using Wire port
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{
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Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing."));
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while (1);
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}
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}
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void loop()
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{
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//Query module only every second. Doing it more often will just cause I2C traffic.
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//The module only responds when a new position is available
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if (millis() - lastTime > 1000)
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{
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lastTime = millis(); //Update the timer
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long latitude = myGPS.getLatitude();
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Serial.print(F("Lat: "));
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Serial.print(latitude);
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long longitude = myGPS.getLongitude();
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Serial.print(F(" Long: "));
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Serial.print(longitude);
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Serial.print(F(" (degrees * 10^-7)"));
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long altitude = myGPS.getAltitude();
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Serial.print(F(" Alt: "));
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Serial.print(altitude);
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Serial.print(F(" (mm)"));
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long altitudeMSL = myGPS.getAltitudeMSL();
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Serial.print(F(" AltMSL: "));
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Serial.print(altitudeMSL);
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Serial.print(F(" (mm)"));
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Serial.println();
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}
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}
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