1  // SPDX-FileCopyrightText: 2019 Anne Barela for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  // Test code for Adafruit GPS modules using MTK driver
 6  // such as www.adafruit.com/products/660 (discontinued)
 7  // For new use see www.adafruit.com/products/746 (needs different code)
 8  // help support open source hardware & software! -adafruit
 9  
10  #include <SoftwareSerial.h>
11  SoftwareSerial mySerial(2, 3);
12  
13  // Connect the GPS Power pin to 3.3V
14  // Connect the GPS Ground pin to ground
15  // Connect the GPS VBAT pin to 3.3V if no battery is used
16  // Connect the GPS TX (transmit) pin to Digital 2
17  // Connect the GPS RX (receive) pin to Digital 3
18  // For 3.3V only modules such as the UP501, connect a 10K
19  // resistor between digital 3 and GPS RX and a 10K resistor 
20  // from GPS RX to ground.
21  
22  // different commands to set the update rate from once a second (1 Hz) to 10 times a second (10Hz)
23  #define PMTK_SET_NMEA_UPDATE_1HZ  "$PMTK220,1000*1F"
24  #define PMTK_SET_NMEA_UPDATE_5HZ  "$PMTK220,200*2C"
25  #define PMTK_SET_NMEA_UPDATE_10HZ "$PMTK220,100*2F"
26  
27  // turn on only the second sentence (GPRMC)
28  #define PMTK_SET_NMEA_OUTPUT_RMCONLY "$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29"
29  // turn on ALL THE DATA
30  #define PMTK_SET_NMEA_OUTPUT_ALLDATA "$PMTK314,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
31  
32  // to generate your own sentences, check out the MTK command datasheet and use a checksum calculator
33  // such as the awesome http://www.hhhh.org/wiml/proj/nmeaxor.html
34  
35  void setup()  
36  {
37    Serial.begin(57600);
38    Serial.println("Adafruit MTK3329 NMEA test!");
39  
40    // 9600 NMEA is the default baud rate
41    mySerial.begin(9600);
42    
43    // uncomment this line to turn on only the "minimum recommended" data for high update rates!
44    //mySerial.println(PMTK_SET_NMEA_OUTPUT_RMCONLY);
45  
46    // uncomment this line to turn on all the available data - for 9600 baud you'll want 1 Hz rate
47    mySerial.println(PMTK_SET_NMEA_OUTPUT_ALLDATA);
48    
49    // Set the update rate
50    // 1 Hz update rate
51    mySerial.println(PMTK_SET_NMEA_UPDATE_1HZ);
52    // 5 Hz update rate- for 9600 baud you'll have to set the output to RMC only (see above)
53    //mySerial.println(PMTK_SET_NMEA_UPDATE_5HZ);
54    // 10 Hz update rate - for 9600 baud you'll have to set the output to RMC only (see above)
55    //mySerial.println(PMTK_SET_NMEA_UPDATE_10HZ);
56  
57  }
58  
59  void loop()                     // run over and over again
60  {
61  
62    if (mySerial.available()) {
63        Serial.print((char)mySerial.read());
64    }
65    if (Serial.available()) {
66        mySerial.print((char)Serial.read());
67    }
68  }