Using a PA1010 GPS sensor from Adafruit.
My code is as follows:
// Test code for Adafruit GPS That Support Using I2C
//
// This code shows how to parse data from the I2C GPS
//
// Pick one up today at the Adafruit electronics shop
// and help support open source hardware & software! -ada
#include <Adafruit_GPS.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Connect to the GPS on the hardware I2C port
Adafruit_GPS GPS(&Wire);
// set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4); // set the LCD address to 0x27 for a 20 chars and 4 line display
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO false
uint32_t timer = millis();
void setup()
{
//while (!Serial); // uncomment to have the sketch wait until Serial is ready
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
Serial.begin(9600);
Serial.println("Adafruit I2C GPS library basic test!");
//Initialize LCD
lcd.init();
lcd.init();
lcd.backlight();
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
GPS.begin(0x10); // The I2C address to use is 0x10
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
// the parser doesn't care about other sentences at this time
// Set the update rate
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
// For the parsing code to work nicely and have time to sort thru the data, and
// print it out we don't suggest using anything higher than 1 Hz
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
delay(1000);
// Ask for firmware version
GPS.println(PMTK_Q_RELEASE);
}
void loop() // run over and over again
{
// read data from the GPS in the 'main loop'
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) Serial.print(c);
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trying to print out data
Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
}
// approximately every 2 seconds or so, print out the current stats
if (millis() - timer > 2000) {
timer = millis(); // reset the timer
Serial.print("\nTime: ");
if (GPS.hour < 10) {
Serial.print('0');
}
Serial.print(GPS.hour, DEC); Serial.print(':');
if (GPS.minute < 10) {
Serial.print('0');
}
Serial.print(GPS.minute, DEC); Serial.print(':');
if (GPS.seconds < 10) {
Serial.print('0');
}
Serial.print(GPS.seconds, DEC); Serial.print('.');
if (GPS.milliseconds < 10) {
Serial.print("00");
} else if (GPS.milliseconds > 9 && GPS.milliseconds < 100) {
Serial.print("0");
}
Serial.println(GPS.milliseconds);
Serial.print("Date: ");
Serial.print(GPS.day, DEC); Serial.print('/');
Serial.print(GPS.month, DEC); Serial.print("/20");
Serial.println(GPS.year, DEC);
Serial.print("Fix: "); Serial.print((int)GPS.fix);
Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
if (GPS.fix) {
Serial.print("Location: ");
Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
Serial.print(", ");
Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
Serial.print("Speed (knots): "); Serial.println(GPS.speed);
Serial.print("Angle: "); Serial.println(GPS.angle);
Serial.print("Altitude: "); Serial.println(GPS.altitude);
Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
// LCD Data
lcd.clear();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print(" LAT: ");
lcd.print(GPS.latitude, 4);
lcd.print(GPS.lat);
lcd.setCursor(0, 1);
lcd.print(" LON: ");
lcd.print(GPS.longitude, 4);
lcd.print(GPS.lon);
lcd.setCursor(0, 2);
lcd.print("Altitude: "); lcd.print(GPS.altitude * 3.28084); lcd.print(" Ft.");
lcd.setCursor(0, 3);
lcd.print("Satellites: "); lcd.print((int)GPS.satellites);
}
}
}
}
I have tried a few things with the code but the problem with the display persist. I have even tried a different LCD which I know to be good. The above code yields:
Rather than "LON" I am getting ".ON" so I tried to modify the code:
// LCD Data
lcd.clear();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(" LAT: ");
lcd.print(GPS.latitude, 4);
lcd.print(GPS.lat);
lcd.setCursor(0,1);
lcd.print(" LON: ");
lcd.print(GPS.longitude, 4);
lcd.print(GPS.lon);
lcd.setCursor(0,2);
lcd.print("Altitude: "); lcd.print(GPS.altitude*3.28084);lcd.print(" Ft.");
lcd.setCursor(0,3);
lcd.print("Satellites: "); lcd.print((int)GPS.satellites);
I keep getting what looks to be a decimal point preceding the data. I even tried starting the line one character in but I get pretty much the same. A few times after a reset things worked but it quickly reverts back to what we see here. The data is accurate enough. During the day I get 6 or 7 satellites and after dark I get as many as 13. The serial monitor data looks fine:
Anyone familiar with this quirk? I can't figure it out.
Thank You
Ron
