How to Display Latitude and Longitude on an LCD Using Tracking Kit (GPRS + GPS)
Difficulty Level: Beginner -
1. Introduction
This tutorial allows the user to view the GPS position, latitude and longitude, in a LCD display.
Ingredients:
-
- 1 x Tracking Kit (GPRS + GPS):
- 1x Platform
- 1x GPRS+GPS Quadband Module (SIM908)
- 1x GPRS antenna
- 1x GPS antenna
- 1x LCD
- 1x Potentiometer
- 1x Breadboard
- 1x External power supply
- 1x Programming cable
- Jumper Wires
Preparation Time: 30 minutes
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NOTE: Depending on the platform chosen to develop the project, the ingredients and the schematics shown in this tutorial can vary.
This project can be developed with Arduino or Intel Galileo. It is also compatible with Raspberry Pi using the Raspberry Pi to Arduino shields connection bridge.
For further information about the GPRS+GPS (SIM908) Shield, consult the main tutorial.
Step 1: Connection
Connect the GPRS and GPS antenna to the shield and then, connect the shield to the Arduino or to Raspberry Pi connection bridge. Connect the LCD display and the potentiometer in the breadboard as you can see in the next diagram.
Connect two wires, red and black, to the two long rows on the side of the breadboard to provide access to the VCC supply (5V in Arduino and 3.3V in Raspberry Pi) and ground. Connect left terminal of the potentiometer to VCC and the right terminal to GND. Connect the central leg of the potentiometer to the third pin of the LCD display. Follow the wire color diagram to connect all LCD pins.
WARNING: In Raspberry Pi, GPIO voltage levels are 3.3 V and are not 5 V tolerant. There is no over-voltage protection on the board. Digital inputs use a 3V3 logic level and are not tolerant of 5V levels, such as you might find on a 5V powered Arduino.
Extreme caution when working with GPIO, you may damage your Raspberry Pi, your equipment and potentially yourself and others. Doing so is at your own risk!
Step 2: The Code
Arduino:
Code:
/*
* GPRS+GPS Quadband Module (SIM908)
*
* Copyright (C) Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* a
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Version: 1.0
* Design: David GascĂłn
* Implementation: Victor Boria
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 6, 5, 4, 3);
//Enter here you data
const char pin_number[] = "****"; // Write the pin number of the SIM card
int onModulePin = 2;
char aux_string[30];
int8_t answer;
int flag = 0;
char frame[200];
char latitude[15];
char longitude[15];
char altitude[6];
char date[16];
char time[7];
char satellites[3];
char speedOTG[10];
char course[10];
void setup() {
lcd.begin(16, 2); // set up the number of columns and rows on the LCD
pinMode(onModulePin, OUTPUT);
Serial.begin(115200);
Serial.println("Starting...");// Print a message to serial monitor
lcd.print("Starting..."); // Print a message to the LCD.
power_on(); // Powering the module
delay(5000);
//sets the PIN code
sprintf(aux_string, "AT+CPIN=%s", pin_number);
sendATcommand(aux_string, "OK", 2000);
delay(3000);
Serial.println("Connecting to the network...");
lcd.setCursor(0, 0);
lcd.print("Connecting to ");
lcd.setCursor(0, 1); // set the cursor to column 0, line 1
lcd.print("the network "); // print to the second line
//Check network registration
while ( (sendATcommand("AT+CREG?", "+CREG: 0,1", 1000) ||
sendATcommand("AT+CREG?", "+CREG: 0,5", 1000)) == 0 );
sendATcommand("AT+CLIP=1", "OK", 1000);
while ( start_GPS() == 0);
Serial.println("Connected to the network!!");
lcd.clear(); // clear the LCD
lcd.setCursor(0, 0); // set the cursor to column 0, line 0
lcd.print("Connected to ");
lcd.setCursor(0, 1);
// print to the second line
lcd.print("the network! ");
delay(1000);
while (Serial.available() != 0)
{
Serial.read();
}
}
void loop() {
get_GPS();
delay(500);
Serial.print("Latitude: ");
Serial.print(latitude);
Serial.print(" / Longitude: ");
Serial.println(longitude);
lcd.setCursor(0, 0);
lcd.print("Lat:");
lcd.setCursor(4, 0);
lcd.print(latitude);
lcd.setCursor(0, 1);
lcd.print("Lon:");
lcd.setCursor(4, 1);
lcd.print(longitude);
delay(1000);
}
/************************************************************************
**** Definition of functions ****
************************************************************************/
void power_on() {
uint8_t answer = 0;
// checks if the module is started
answer = sendATcommand("AT", "OK", 2000);
if (answer == 0)
{
// power on pulse
digitalWrite(onModulePin, HIGH);
delay(3000);
digitalWrite(onModulePin, LOW);
// waits for an answer from the module
while (answer == 0) { // Send AT every two seconds and wait for the answer
answer = sendATcommand("AT", "OK", 2000);
}
}
}
int8_t sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout) {
uint8_t x = 0, answer = 0;
char response[100];
unsigned long previous;
memset(response, '\0', 100); // Initialice the string
delay(100);
while ( Serial.available() > 0) Serial.read(); // Clean the input buffer
if (ATcommand[0] != '\0')
{
Serial.println(ATcommand); // Send the AT command
}
x = 0;
previous = millis();
// this loop waits for the answer
do {
if (Serial.available() != 0) { // if there are data in the UART input buffer, reads it and checks for the asnwer
response[x] = Serial.read();
//Serial.print(response[x]);
x++;
if (strstr(response, expected_answer) != NULL) // check if the desired answer (OK) is in the response of the module
{
answer = 1;
}
}
}
while ((answer == 0) && ((millis() - previous) < timeout)); // Waits for the asnwer with time out
return answer;
}
int8_t start_GPS() {
unsigned long previous;
previous = millis();
// starts the GPS
sendATcommand("AT+CGPSPWR=1", "OK", 2000);
sendATcommand("AT+CGPSRST=0", "OK", 2000);
// waits for fix GPS
while (( (sendATcommand("AT+CGPSSTATUS?", "2D Fix", 5000) ||
sendATcommand("AT+CGPSSTATUS?", "3D Fix", 5000)) == 0 ) &&
((millis() - previous) < 90000));
if ((millis() - previous) < 90000)
{
return 1;
}
else
{
return 0;
}
}
int8_t get_GPS() {
int8_t counter, answer;
long previous;
// First get the NMEA string
// Clean the input buffer
while ( Serial.available() > 0) Serial.read();
// request Basic string
sendATcommand("AT+CGPSINF=0", "AT+CGPSINF=0\r\n\r\n", 2000);
counter = 0;
answer = 0;
memset(frame, '\0', 100); // Initialize the string
previous = millis();
// this loop waits for the NMEA string
do {
if (Serial.available() != 0) {
frame[counter] = Serial.read();
counter++;
// check if the desired answer is in the response of the module
if (strstr(frame, "OK") != NULL)
{
answer = 1;
}
}
// Waits for the asnwer with time out
}
while ((answer == 0) && ((millis() - previous) < 2000));
frame[counter - 3] = '\0';
// Parses the string
strtok(frame, ",");
strcpy(longitude, strtok(NULL, ",")); // Gets longitude
strcpy(latitude, strtok(NULL, ",")); // Gets latitude
strcpy(altitude, strtok(NULL, ".")); // Gets altitude
strtok(NULL, ",");
strcpy(date, strtok(NULL, ".")); // Gets date
strtok(NULL, ",");
strtok(NULL, ",");
strcpy(satellites, strtok(NULL, ",")); // Gets satellites
strcpy(speedOTG, strtok(NULL, ",")); // Gets speed over ground. Unit is knots.
strcpy(course, strtok(NULL, "\r")); // Gets course
convert2Degrees(latitude);
convert2Degrees(longitude);
return answer;
}
/* convert2Degrees ( input ) - performs the conversion from input
* parameters in DD°MM.mmm’ notation to DD.dddddd° notation.
*
* Sign '+' is set for positive latitudes/longitudes (North, East)
* Sign '-' is set for negative latitudes/longitudes (South, West)
*
*/
int8_t convert2Degrees(char* input) {
float deg;
float minutes;
boolean neg = false;
//auxiliar variable
char aux[10];
if (input[0] == '-')
{
neg = true;
strcpy(aux, strtok(input + 1, "."));
}
else
{
strcpy(aux, strtok(input, "."));
}
// convert string to integer and add it to final float variable
deg = atof(aux);
strcpy(aux, strtok(NULL, '\0'));
minutes = atof(aux);
minutes /= 1000000;
if (deg < 100)
{
minutes += deg;
deg = 0;
}
else
{
minutes += int(deg) % 100;
deg = int(deg) / 100;
}
// add minutes to degrees
deg = deg + minutes / 60;
if (neg == true)
{
deg *= -1.0;
}
neg = false;
if ( deg < 0 ) {
neg = true;
deg *= -1;
}
float numeroFloat = deg;
int parteEntera[10];
int cifra;
long numero = (long)numeroFloat;
int size = 0;
while (1) {
size = size + 1;
cifra = numero % 10;
numero = numero / 10;
parteEntera[size - 1] = cifra;
if (numero == 0) {
break;
}
}
int indice = 0;
if ( neg ) {
indice++;
input[0] = '-';
}
for (int i = size - 1; i >= 0; i--)
{
input[indice] = parteEntera[i] + '0';
indice++;
}
input[indice] = '.';
indice++;
numeroFloat = (numeroFloat - (int)numeroFloat);
for (int i = 1; i <= 6 ; i++)
{
numeroFloat = numeroFloat * 10;
cifra = (long)numeroFloat;
numeroFloat = numeroFloat - cifra;
input[indice] = char(cifra) + 48;
indice++;
}
input[indice] = '\0';
}
Raspberry Pi:
Code:
/*
* GPRS+GPS Quadband Module (SIM908)
*
* Copyright (C) Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* a
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Version: 1.0
* Design: David GascĂłn
* Implementation: Marcos MartĂnez
*/
//Include arduPi library
#include "arduPi.h"
int8_t sendATcommand(const char* ATcommand, const char* expected_answer, unsigned int timeout);
void power_on();
int8_t start_GPS();
int8_t get_GPS();
int8_t convert2Degrees(char* input);
//Enter here you data
const char pin_number[] = "****"; // Write the pin number of the SIM card
int onModulePin = 2;
char aux_string[30];
int8_t answer;
int flag = 0;
char frame[200];
char latitude[15];
char longitude[15];
char altitude[6];
char date[16];
char satellites[3];
char speedOTG[10];
char course[10];
void setup() {
pinMode(onModulePin, OUTPUT);
Serial.begin(115200);
printf("Starting...\n");// Print a message to serial monitor
power_on(); // Powering the module
delay(5000);
//sets the PIN code
sprintf(aux_string, "AT+CPIN=%s", pin_number);
sendATcommand(aux_string, "OK", 2000);
delay(3000);
printf("Connecting to the network...\n");
//Check network registration
while ( (sendATcommand("AT+CREG?", "+CREG: 0,1", 1000) ||
sendATcommand("AT+CREG?", "+CREG: 0,5", 1000)) == 0 );
sendATcommand("AT+CLIP=1", "OK", 1000);
while ( start_GPS() == 0);
printf("Connected to the network!!\n");
delay(1000);
while (Serial.available() != 0)
{
Serial.read();
}
}
void loop() {
get_GPS();
delay(500);
printf("Latitude: %s",latitude);
printf(" / Longitude: %s\n",longitude);
delay(1000);
}
/************************************************************************
**** Definition of functions ****
************************************************************************/
void power_on() {
uint8_t answer = 0;
// checks if the module is started
answer = sendATcommand("AT", "OK", 2000);
if (answer == 0)
{
// power on pulse
digitalWrite(onModulePin, HIGH);
delay(3000);
digitalWrite(onModulePin, LOW);
// waits for an answer from the module
while (answer == 0) { // Send AT every two seconds and wait for the answer
answer = sendATcommand("AT", "OK", 2000);
}
}
}
int8_t sendATcommand(const char* ATcommand, const char* expected_answer, unsigned int timeout){
uint8_t x=0, answer=0;
char response[100];
unsigned long previous;
memset(response, '\0', 100); // Initialize the string
delay(100);
while( Serial.available() > 0) Serial.read(); // Clean the input buffer
Serial.println(ATcommand); // Send the AT command
x = 0;
previous = millis();
// this loop waits for the answer
do{
if(Serial.available() != 0){
// if there are data in the UART input buffer, reads it and checks for the asnwer
response[x] = Serial.read();
printf("%c",response[x]);
x++;
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer) != NULL)
{
printf("\n");
answer = 1;
}
}
}
// Waits for the asnwer with time out
while((answer == 0) && ((millis() - previous) < timeout));
return answer;
}
int8_t start_GPS() {
unsigned long previous;
previous = millis();
// starts the GPS
sendATcommand("AT+CGPSPWR=1", "OK", 2000);
sendATcommand("AT+CGPSRST=0", "OK", 2000);
// waits for fix GPS
while (( (sendATcommand("AT+CGPSSTATUS?", "2D Fix", 5000) ||
sendATcommand("AT+CGPSSTATUS?", "3D Fix", 5000)) == 0 ) &&
((millis() - previous) < 90000));
if ((millis() - previous) < 90000)
{
return 1;
}
else
{
return 0;
}
}
int8_t get_GPS() {
int8_t answer,counter;
long previous;
// First get the NMEA string
// Clean the input buffer
while ( Serial.available() > 0) Serial.read();
delay(100);
// request Basic string
sendATcommand("AT+CGPSINF=0", "AT+CGPSINF=0\r\n\r\n", 2000);
counter = 0;
answer = 0;
memset(frame, '\0', 200); // Initialize the string
previous = millis();
// this loop waits for the NMEA string
do {
if (Serial.available() != 0) {
frame[counter] = Serial.read();
counter++;
// check if the desired answer is in the response of the module
if (strstr(frame, "OK") != NULL)
{
answer = 1;
}
}
// Waits for the asnwer with time out
}
while ((answer == 0) && ((millis() - previous) < 2000));
frame[counter - 3] = '\0';
// Parses the string
strtok(frame, ",");
strcpy(longitude, strtok(NULL, ",")); // Gets longitude
strcpy(latitude, strtok(NULL, ",")); // Gets latitude
strcpy(altitude, strtok(NULL, ".")); // Gets altitude
strtok(NULL, ",");
strcpy(date, strtok(NULL, ".")); // Gets date
strtok(NULL, ",");
strtok(NULL, ",");
strcpy(satellites, strtok(NULL, ",")); // Gets satellites
strcpy(speedOTG, strtok(NULL, ",")); // Gets speed over ground. Unit is knots.
strcpy(course, strtok(NULL, "\r")); // Gets course
convert2Degrees(latitude);
convert2Degrees(longitude);
return answer;
}
/* convert2Degrees ( input ) - performs the conversion from input
* parameters in DD°MM.mmm’ notation to DD.dddddd° notation.
*
* Sign '+' is set for positive latitudes/longitudes (North, East)
* Sign '-' is set for negative latitudes/longitudes (South, West)
*
*/
int8_t convert2Degrees(char* input) {
float deg;
float minutes;
boolean neg = false;
//auxiliar variable
char aux[10];
memset(aux, '\0', sizeof(aux));
if (input[0] == '-')
{
neg = true;
strncpy(aux, input+1, strchr(input, '.') - input - 1);
}
else
{
strncpy(aux, input, strchr(input, '.') - input );
}
// convert string to integer and add it to final float variable
deg = atof(aux);
memset(aux, '\0', sizeof(aux));
strncpy(aux, strchr(input, '.')+1, strlen(input) - (strchr(input, '.') - input) + 1);
minutes = atof(aux);
minutes /= 1000000;
if (deg < 100)
{
minutes += deg;
deg = 0;
}
else
{
minutes += int(deg) % 100;
deg = int(deg) / 100;
}
// add minutes to degrees
deg = deg + minutes / 60;
if (neg == true)
{
deg *= -1.0;
}
neg = false;
if ( deg < 0 ) {
neg = true;
deg *= -1;
}
float numeroFloat = deg;
int parteEntera[10];
int cifra;
long numero = (long)numeroFloat;
int size = 0;
while (1) {
size = size + 1;
cifra = numero % 10;
numero = numero / 10;
parteEntera[size - 1] = cifra;
if (numero == 0) {
break;
}
}
int indice = 0;
if ( neg ) {
indice++;
input[0] = '-';
}
for (int i = size - 1; i >= 0; i--)
{
input[indice] = parteEntera[i] + '0';
indice++;
}
input[indice] = '.';
indice++;
numeroFloat = (numeroFloat - (int)numeroFloat);
for (int i = 1; i <= 6 ; i++)
{
numeroFloat = numeroFloat * 10;
cifra = (long)numeroFloat;
numeroFloat = numeroFloat - cifra;
input[indice] = char(cifra) + 48;
indice++;
}
input[indice] = '\0';
}
int main (){
setup();
while(1){
loop();
}
return (0);
}
Intel Galileo:
Code:
/*
* GPRS+GPS Quadband Module (SIM908)
*
* Copyright (C) Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* a
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Version: 1.0
* Design: David GascĂłn
* Implementation: Jorge Casanova, Luis MartĂn
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 6, 5, 4, 3);
//Enter here you data
const char pin_number[] = "****"; // Write the pin number of the SIM card
int onModulePin = 2;
char aux_string[30];
int8_t answer;
int flag = 0;
char frame[200];
char latitude[15];
char longitude[15];
char altitude[6];
char date[16];
char satellites[3];
char speedOTG[10];
char course[10];
void setup() {
lcd.begin(16, 2); // set up the number of columns and rows on the LCD
pinMode(onModulePin, OUTPUT);
Serial.begin(115200);
Serial1.begin(115200);
Serial.println("Starting...");// Print a message to serial monitor
lcd.print("Starting..."); // Print a message to the LCD.
power_on(); // Powering the module
delay(5000);
//sets the PIN code
sprintf(aux_string, "AT+CPIN=%s", pin_number);
sendATcommand(aux_string, "OK", 2000);
delay(3000);
Serial.println(" ");
Serial.println("Connecting to the network...");
lcd.setCursor(0, 0);
lcd.print("Connecting to ");
lcd.setCursor(0, 1); // set the cursor to column 0, line 1
lcd.print("the network "); // print to the second line
//Check network registration
while ( (sendATcommand("AT+CREG?", "+CREG: 0,1", 1000) ||
sendATcommand("AT+CREG?", "+CREG: 0,5", 1000)) == 0 );
sendATcommand("AT+CLIP=1", "OK", 1000);
while ( start_GPS() == 0);
Serial.println("Connected to the network!!");
lcd.clear(); // clear the LCD
lcd.setCursor(0, 0); // set the cursor to column 0, line 0
lcd.print("Connected to ");
lcd.setCursor(0, 1);
// print to the second line
lcd.print("the network! ");
delay(1000);
while (Serial1.available() != 0)
{
Serial1.read();
}
}
void loop() {
get_GPS();
delay(500);
Serial.print("Latitude: ");
Serial.print(latitude);
Serial.print(" / Longitude: ");
Serial.println(longitude);
lcd.setCursor(0, 0);
lcd.print("Lat:");
lcd.setCursor(4, 0);
lcd.print(latitude);
lcd.setCursor(0, 1);
lcd.print("Lon:");
lcd.setCursor(4, 1);
lcd.print(longitude);
delay(1000);
}
/************************************************************************
**** Definition of functions ****
************************************************************************/
void power_on() {
uint8_t answer = 0;
// checks if the module is started
answer = sendATcommand("AT", "OK", 2000);
if (answer == 0)
{
// power on pulse
digitalWrite(onModulePin, HIGH);
delay(3000);
digitalWrite(onModulePin, LOW);
// waits for an answer from the module
while (answer == 0) { // Send AT every two seconds and wait for the answer
answer = sendATcommand("AT", "OK", 2000);
}
}
}
int8_t sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout) {
uint8_t x = 0, answer = 0;
char response[100];
unsigned long previous;
memset(response, '\0', 100); // Initialice the string
delay(100);
while ( Serial1.available() > 0) Serial1.read(); // Clean the input buffer
if (ATcommand[0] != '\0')
{
Serial1.println(ATcommand); // Send the AT command
}
x = 0;
previous = millis();
// this loop waits for the answer
do {
if (Serial1.available() != 0) { // if there are data in the UART input buffer, reads it and checks for the asnwer
response[x] = Serial1.read();
Serial.print(response[x]);
x++;
if (strstr(response, expected_answer) != NULL) // check if the desired answer (OK) is in the response of the module
{
answer = 1;
}
}
}
while ((answer == 0) && ((millis() - previous) < timeout)); // Waits for the asnwer with time out
return answer;
}
int8_t start_GPS() {
unsigned long previous;
previous = millis();
// starts the GPS
sendATcommand("AT+CGPSPWR=1", "OK", 2000);
sendATcommand("AT+CGPSRST=0", "OK", 2000);
// waits for fix GPS
while (( (sendATcommand("AT+CGPSSTATUS?", "2D Fix", 5000) ||
sendATcommand("AT+CGPSSTATUS?", "3D Fix", 5000)) == 0 ) &&
((millis() - previous) < 90000));
if ((millis() - previous) < 90000)
{
return 1;
}
else
{
return 0;
}
}
int8_t get_GPS() {
int8_t counter, answer;
long previous;
// First get the NMEA string
// Clean the input buffer
while ( Serial1.available() > 0) Serial1.read();
// request Basic string
sendATcommand("AT+CGPSINF=0", "AT+CGPSINF=0\r\n\r\n", 2000);
counter = 0;
answer = 0;
memset(frame, '\0', 100); // Initialize the string
previous = millis();
// this loop waits for the NMEA string
do {
if (Serial1.available() != 0) {
frame[counter] = Serial1.read();
counter++;
// check if the desired answer is in the response of the module
if (strstr(frame, "OK") != NULL)
{
answer = 1;
}
}
// Waits for the asnwer with time out
}
while ((answer == 0) && ((millis() - previous) < 2000));
frame[counter - 3] = '\0';
// Parses the string
strtok(frame, ",");
strcpy(longitude, strtok(NULL, ",")); // Gets longitude
strcpy(latitude, strtok(NULL, ",")); // Gets latitude
strcpy(altitude, strtok(NULL, ".")); // Gets altitude
strtok(NULL, ",");
strcpy(date, strtok(NULL, ".")); // Gets date
strtok(NULL, ",");
strtok(NULL, ",");
strcpy(satellites, strtok(NULL, ",")); // Gets satellites
strcpy(speedOTG, strtok(NULL, ",")); // Gets speed over ground. Unit is knots.
strcpy(course, strtok(NULL, "\r")); // Gets course
convert2Degrees(latitude);
convert2Degrees(longitude);
return answer;
}
/* convert2Degrees ( input ) - performs the conversion from input
* parameters in DD°MM.mmm’ notation to DD.dddddd° notation.
*
* Sign '+' is set for positive latitudes/longitudes (North, East)
* Sign '-' is set for negative latitudes/longitudes (South, West)
*
*/
int8_t convert2Degrees(char* input) {
float deg;
float minutes;
boolean neg = false;
//auxiliar variable
char aux[10];
if (input[0] == '-')
{
neg = true;
strcpy(aux, strtok(input + 1, "."));
}
else
{
strcpy(aux, strtok(input, "."));
}
// convert string to integer and add it to final float variable
deg = atof(aux);
strcpy(aux, strtok(NULL, "\0"));
minutes = atof(aux);
minutes /= 1000000;
if (deg < 100)
{
minutes += deg;
deg = 0;
}
else
{
minutes += int(deg) % 100;
deg = int(deg) / 100;
}
// add minutes to degrees
deg = deg + minutes / 60;
if (neg == true)
{
deg *= -1.0;
}
neg = false;
if ( deg < 0 ) {
neg = true;
deg *= -1;
}
float numeroFloat = deg;
int parteEntera[10];
int cifra;
long numero = (long)numeroFloat;
int size = 0;
while (1) {
size = size + 1;
cifra = numero % 10;
numero = numero / 10;
parteEntera[size - 1] = cifra;
if (numero == 0) {
break;
}
}
int indice = 0;
if ( neg ) {
indice++;
input[0] = '-';
}
for (int i = size - 1; i >= 0; i--)
{
input[indice] = parteEntera[i] + '0';
indice++;
}
input[indice] = '.';
indice++;
numeroFloat = (numeroFloat - (int)numeroFloat);
for (int i = 1; i <= 6 ; i++)
{
numeroFloat = numeroFloat * 10;
cifra = (long)numeroFloat;
numeroFloat = numeroFloat - cifra;
input[indice] = char(cifra) + 48;
indice++;
}
input[indice] = '\0';
}
Links and Documentation
Related Tutorials
- Geolocation Tracker (GPRS + GPS) with SIM908 over Arduino and Raspberry Pi
- How to Make a Call with Push Buttons Using Tracking Kit (GPRS + GPS)
- How to Send a Temperature Emergency SMS Using Tracking Kit (GPRS + GPS)
- How to Control a Servo with Text Messages Using Tracking Kit (GPRS + GPS)
- How to Display Latitude and Longitude on an LCD Using Tracking Kit (GPRS + GPS)
Datasheets and Manuals
If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.
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