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140 lines
4.3 KiB
140 lines
4.3 KiB
#include <TinyGPSPlus.h>
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#include <SoftwareSerial.h>
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/*
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This sample code demonstrates how to use an array of TinyGPSCustom objects
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to monitor all the visible satellites.
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Satellite numbers, elevation, azimuth, and signal-to-noise ratio are not
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normally tracked by TinyGPSPlus, but by using TinyGPSCustom we get around this.
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The simple code also demonstrates how to use arrays of TinyGPSCustom objects,
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each monitoring a different field of the $GPGSV sentence.
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It requires the use of SoftwareSerial, and assumes that you have a
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4800-baud serial GPS device hooked up on pins 4(RX) and 3(TX).
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*/
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static const int RXPin = 4, TXPin = 3;
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static const uint32_t GPSBaud = 4800;
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// The TinyGPSPlus object
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TinyGPSPlus gps;
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// The serial connection to the GPS device
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SoftwareSerial ss(RXPin, TXPin);
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/*
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From http://aprs.gids.nl/nmea/:
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$GPGSV
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GPS Satellites in view
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eg. $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
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$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74
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$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D
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1 = Total number of messages of this type in this cycle
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2 = Message number
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3 = Total number of SVs in view
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4 = SV PRN number
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5 = Elevation in degrees, 90 maximum
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6 = Azimuth, degrees from true north, 000 to 359
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7 = SNR, 00-99 dB (null when not tracking)
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8-11 = Information about second SV, same as field 4-7
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12-15= Information about third SV, same as field 4-7
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16-19= Information about fourth SV, same as field 4-7
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*/
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static const int MAX_SATELLITES = 40;
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TinyGPSCustom totalGPGSVMessages(gps, "GPGSV", 1); // $GPGSV sentence, first element
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TinyGPSCustom messageNumber(gps, "GPGSV", 2); // $GPGSV sentence, second element
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TinyGPSCustom satsInView(gps, "GPGSV", 3); // $GPGSV sentence, third element
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TinyGPSCustom satNumber[4]; // to be initialized later
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TinyGPSCustom elevation[4];
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TinyGPSCustom azimuth[4];
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TinyGPSCustom snr[4];
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struct {
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bool active;
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int elevation;
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int azimuth;
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int snr;
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} sats[MAX_SATELLITES];
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void setup() {
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Serial.begin(115200);
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ss.begin(GPSBaud);
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Serial.println(F("SatelliteTracker.ino"));
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Serial.println(F("Monitoring satellite location and signal strength using TinyGPSCustom"));
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Serial.print(F("Testing TinyGPSPlus library v. ")); Serial.println(TinyGPSPlus::libraryVersion());
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Serial.println(F("by Mikal Hart"));
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Serial.println();
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// Initialize all the uninitialized TinyGPSCustom objects
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for (int i=0; i<4; ++i) {
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satNumber[i].begin(gps, "GPGSV", 4 + 4 * i); // offsets 4, 8, 12, 16
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elevation[i].begin(gps, "GPGSV", 5 + 4 * i); // offsets 5, 9, 13, 17
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azimuth[i].begin( gps, "GPGSV", 6 + 4 * i); // offsets 6, 10, 14, 18
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snr[i].begin( gps, "GPGSV", 7 + 4 * i); // offsets 7, 11, 15, 19
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}
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}
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void loop() {
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// Dispatch incoming characters
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if (ss.available() > 0) {
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gps.encode(ss.read());
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if (totalGPGSVMessages.isUpdated()) {
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for (int i=0; i<4; ++i) {
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int no = atoi(satNumber[i].value());
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// Serial.print(F("SatNumber is ")); Serial.println(no);
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if (no >= 1 && no <= MAX_SATELLITES) {
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sats[no-1].elevation = atoi(elevation[i].value());
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sats[no-1].azimuth = atoi(azimuth[i].value());
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sats[no-1].snr = atoi(snr[i].value());
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sats[no-1].active = true;
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}
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}
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int totalMessages = atoi(totalGPGSVMessages.value());
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int currentMessage = atoi(messageNumber.value());
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if (totalMessages == currentMessage) {
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Serial.print(F("Sats=")); Serial.print(gps.satellites.value());
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Serial.print(F(" Nums="));
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for (int i=0; i<MAX_SATELLITES; ++i) {
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if (sats[i].active) {
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Serial.print(i+1);
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Serial.print(F(" "));
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}
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}
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Serial.print(F(" Elevation="));
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for (int i=0; i<MAX_SATELLITES; ++i) {
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if (sats[i].active) {
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Serial.print(sats[i].elevation);
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Serial.print(F(" "));
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}
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}
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Serial.print(F(" Azimuth="));
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for (int i=0; i<MAX_SATELLITES; ++i) {
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if (sats[i].active) {
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Serial.print(sats[i].azimuth);
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Serial.print(F(" "));
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}
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}
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Serial.print(F(" SNR="));
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for (int i=0; i<MAX_SATELLITES; ++i) {
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if (sats[i].active) {
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Serial.print(sats[i].snr);
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Serial.print(F(" "));
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}
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}
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Serial.println();
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for (int i=0; i<MAX_SATELLITES; ++i) {
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sats[i].active = false;
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}
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}
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}
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}
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}
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