Interfacing the GPS shield with the Arduino UNO board

1// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
2//
3//  This code shows how to listen to the GPS module in an interrupt
4// which allows  the program to have more 'freedom' - just parse
5// when a new NMEA sentence is  available! Then access data when
6// desired.
7//
8// Tested and works great  with the Adafruit Ultimate GPS module
9// using MTK33x9 chipset
10//    ------>  http://www.adafruit.com/products/746
11// Pick one up today at the Adafruit electronics  shop
12// and help support open source hardware & software! -ada
13
14#include  <Adafruit_GPS.h>
15#include <SoftwareSerial.h>
16
17// Connect the GPS Power  pin to 5V
18// Connect the GPS Ground pin to ground
19// Connect the GPS TX (transmit)  pin to Digital 8
20// Connect the GPS RX (receive) pin to Digital 7
21
22// you  can change the pin numbers to match your wiring:
23SoftwareSerial mySerial(8, 7);
24Adafruit_GPS  GPS(&mySerial);
25
26// Set GPSECHO to 'false' to turn off echoing the GPS data  to the Serial console
27// Set to 'true' if you want to debug and listen to the  raw GPS sentences
28#define GPSECHO  true
29
30void setup()
31{
32
33  //  connect at 115200 so we can read the GPS fast enough and echo without dropping chars
34  // also spit it out
35  Serial.begin(115200);
36  delay(5000);
37  Serial.println("Adafruit  GPS library basic test!");
38
39  // 9600 NMEA is the default baud rate for Adafruit  MTK GPS's- some use 4800
40  GPS.begin(9600);
41
42  // uncomment this line to  turn on RMC (recommended minimum) and GGA (fix data) including altitude
43  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
44  // uncomment this line to turn on only the "minimum recommended" data
45  //GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
46  // For parsing data, we don't suggest using anything but either RMC only or RMC+GGA  since
47  // the parser doesn't care about other sentences at this time
48
49  // Set the update rate
50  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1  Hz update rate
51  // For the parsing code to work nicely and have time to sort  thru the data, and
52  // print it out we don't suggest using anything higher than  1 Hz
53
54  // Request updates on antenna status, comment out to keep quiet
55  GPS.sendCommand(PGCMD_ANTENNA);
56
57  delay(1000);
58  // Ask for firmware  version
59  mySerial.println(PMTK_Q_RELEASE);
60}
61
62uint32_t timer = millis();
63void  loop()                     // run over and over again
64{
65  char c = GPS.read();
66  // if you want to debug, this is a good time to do it!
67  if ((c) && (GPSECHO))
68    Serial.write(c);
69
70  // if a sentence is received, we can check the checksum,  parse it...
71  if (GPS.newNMEAreceived()) {
72    // a tricky thing here is if  we print the NMEA sentence, or data
73    // we end up not listening and catching  other sentences!
74    // so be very wary if using OUTPUT_ALLDATA and trytng to  print out data
75    //Serial.println(GPS.lastNMEA());   // this also sets the  newNMEAreceived() flag to false
76
77    if (!GPS.parse(GPS.lastNMEA()))   //  this also sets the newNMEAreceived() flag to false
78      return;  // we can fail  to parse a sentence in which case we should just wait for another
79  }
80
81  // if millis() or timer wraps around, we'll just reset it
82  if (timer > millis())  timer = millis();
83
84  // approximately every 2 seconds or so, print out the  current stats
85  if (millis() - timer > 2000) {
86    timer = millis(); // reset  the timer
87
88    Serial.print("\
89Time: ");
90    if (GPS.hour < 10) { Serial.print('0');  }
91    Serial.print(GPS.hour, DEC); Serial.print(':');
92    if (GPS.minute <  10) { Serial.print('0'); }
93    Serial.print(GPS.minute, DEC); Serial.print(':');
94    if (GPS.seconds < 10) { Serial.print('0'); }
95    Serial.print(GPS.seconds,  DEC); Serial.print('.');
96    if (GPS.milliseconds < 10) {
97      Serial.print("00");
98    } else if (GPS.milliseconds > 9 && GPS.milliseconds < 100) {
99      Serial.print("0");
100    }
101    Serial.println(GPS.milliseconds);
102    Serial.print("Date: ");
103    Serial.print(GPS.day, DEC); Serial.print('/');
104    Serial.print(GPS.month,  DEC); Serial.print("/20");
105    Serial.println(GPS.year, DEC);
106    Serial.print("Fix:  "); Serial.print((int)GPS.fix);
107    Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
108    if (GPS.fix) {
109      Serial.print("Location: ");
110      Serial.print(GPS.latitude,  4); Serial.print(GPS.lat);
111      Serial.print(", ");
112      Serial.print(GPS.longitude,  4); Serial.println(GPS.lon);
113
114      Serial.print("Speed (knots): "); Serial.println(GPS.speed);
115      Serial.print("Angle: "); Serial.println(GPS.angle);
116      Serial.print("Altitude:  "); Serial.println(GPS.altitude);
117      Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
118    }
119  }
120}
121