150 lines
3.7 KiB
C++
150 lines
3.7 KiB
C++
#include <TinyGPS++.h>
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#include <SoftwareSerial.h>
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/*
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This sample code tracks satellite elevations using TinyGPSCustom objects.
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Satellite numbers and elevations are not normally tracked by TinyGPS++, but
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by using TinyGPSCustom we get around this.
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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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static const int MAX_SATELLITES = 40;
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static const int PAGE_LENGTH = 40;
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// The TinyGPS++ 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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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 satNumber[4]; // to be initialized later
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TinyGPSCustom elevation[4];
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bool anyChanges = false;
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unsigned long linecount = 0;
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struct
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{
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int elevation;
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bool active;
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} sats[MAX_SATELLITES];
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void setup()
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{
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Serial.begin(115200);
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ss.begin(GPSBaud);
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Serial.println(F("SatElevTracker.ino"));
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Serial.println(F("Displays GPS satellite elevations as they change"));
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Serial.print(F("Testing TinyGPS++ 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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{
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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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}
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}
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void loop()
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{
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// Dispatch incoming characters
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if (ss.available() > 0)
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{
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gps.encode(ss.read());
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if (totalGPGSVMessages.isUpdated())
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{
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for (int i=0; i<4; ++i)
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{
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int no = atoi(satNumber[i].value());
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if (no >= 1 && no <= MAX_SATELLITES)
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{
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int elev = atoi(elevation[i].value());
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sats[no-1].active = true;
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if (sats[no-1].elevation != elev)
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{
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sats[no-1].elevation = elev;
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anyChanges = true;
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}
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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 && anyChanges)
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{
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if (linecount++ % PAGE_LENGTH == 0)
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printHeader();
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TimePrint();
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for (int i=0; i<MAX_SATELLITES; ++i)
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{
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Serial.print(F(" "));
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if (sats[i].active)
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IntPrint(sats[i].elevation, 2);
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else
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Serial.print(F(" "));
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sats[i].active = false;
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}
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Serial.println();
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anyChanges = false;
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}
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}
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}
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}
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void IntPrint(int n, int len)
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{
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int digs = n < 0 ? 2 : 1;
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for (int i=10; i<=abs(n); i*=10)
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++digs;
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while (digs++ < len)
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Serial.print(F(" "));
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Serial.print(n);
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Serial.print(F(" "));
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}
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void TimePrint()
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{
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if (gps.time.isValid())
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{
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if (gps.time.hour() < 10)
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Serial.print(F("0"));
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Serial.print(gps.time.hour());
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Serial.print(F(":"));
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if (gps.time.minute() < 10)
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Serial.print(F("0"));
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Serial.print(gps.time.minute());
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Serial.print(F(":"));
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if (gps.time.second() < 10)
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Serial.print(F("0"));
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Serial.print(gps.time.second());
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Serial.print(F(" "));
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}
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else
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{
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Serial.print(F("(unknown)"));
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}
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}
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void printHeader()
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{
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Serial.println();
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Serial.print(F("Time "));
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for (int i=0; i<MAX_SATELLITES; ++i)
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{
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Serial.print(F(" "));
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IntPrint(i+1, 2);
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}
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Serial.println();
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Serial.print(F("---------"));
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for (int i=0; i<MAX_SATELLITES; ++i)
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Serial.print(F("----"));
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Serial.println();
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}
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