I am using a SIM900A GSM module and a NEO-6m GPS module. I want to send the location via the GSM module when the GSM module receives a message.
My code is working when I am receiving and sending any message with the help of the GSM module, but it is not working when I join the two, i.e. GPS and GSM modules.
Here is my code for the two.
#include <SoftwareSerial.h>
// GPS
#include <TinyGPS.h>
// GSM
SoftwareSerial SIM900A(9, 10);
SoftwareSerial mySerial(5, 6);
TinyGPS gps;
void setup() {
Serial.begin(9600);
SIM900A.begin(9600);
SIM900A.println("AT+CNMI=2,2,0,0,0");
mySerial.begin(9600);
delay(1000);
}
void loop() {
bool newdata = false;
String buffer = readSIM900A();
if(SIM900A.available() > 0)
Serial.println(SIM900A.read());
if (buffer.startsWith("\r\n+CMT: ")) {
// printing the number
Serial.println(buffer.substring(9, 22));
// Remove first 51 characters
// buffer.remove(0, 51);
int len = buffer.length();
// printing message
Serial.println(buffer.substring(51, len-2));
if (buffer.substring(51, len-2) == "location") {
Serial.println("Sending location");
// GPS
if (mySerial.available()) {
char c = mySerial.read();
if (gps.encode(c)) {
newdata = true;
}
}
if (newdata) {
long int lat, lon;
unsigned long age, age1, date, time, chars;
gps.get_position(&lat, &lon, &age);
gps.get_datetime(&date, &time, &age);
Serial.print("Lat/Long(10^-5 deg): ");
Serial.print(lat);
Serial.print(", ");
Serial.print(lon);
Serial.print(" Fix age: ");
Serial.print(age); Serial.println("ms.");
Serial.print("Date(ddmmyy): "); Serial.print(date);
Serial.print(" Time(hhmmsscc): ");
Serial.print(time);
Serial.print(" Fix age: "); Serial.print(age);
Serial.println("ms.");
Serial.print("Alt(cm): "); Serial.print(gps.altitude());
Serial.print(" Speed(mps): "); Serial.print(gps.f_speed_mps());
// setting GSM module
SIM900A.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(1000); // Delay of 1000 milli seconds or 1 second
// sending location from which code word had come
SIM900A.println("AT+CMGS=\"" + buffer.substring(9, 22) + "\"\r");
// Replace x with mobile number
Serial.println("AT+CMGS=\"" + buffer.substring(9, 22) + "\"\r");
delay(1000);
SIM900A.print("Lat/Long(10^-5 deg): ");
SIM900A.print(lat);
SIM900A.print(", ");
SIM900A.print(lon);
SIM900A.print(" Fix age: ");
SIM900A.print(age); SIM900A.println("ms.");
SIM900A.print("Date(ddmmyy): "); SIM900A.print(date);
SIM900A.print(" Time(hhmmsscc): ");
SIM900A.print(time);
SIM900A.print(" Fix age: "); SIM900A.print(age);
SIM900A.println("ms.");
SIM900A.print("Alt(cm): "); SIM900A.print(gps.altitude());
SIM900A.print(" Speed(mps): "); SIM900A.print(gps.f_speed_mps());
SIM900A.println((char)26);// ASCII code of CTRL+Z
delay(1000);
}
}
}
delay(100);
}
String readSIM900A() {
String buffer;
while (SIM900A.available()) {
char c = SIM900A.read();
buffer.concat(c);
delay(10);
}
return buffer;
}
Above is my final code when the GPS and GSM modules are handled together. They are working totally fine when they are handled separately.
Connections:
Connected Tx, Rx pin of SIM900A to 9, 10 of Arduino Nano respectively, and Tx, Rx of GPS module to 5, 6 respectively. And I also made ground common with Arduino.
#include <NeoSWSerial.h>
//#include <SoftwareSerial.h>
#include <AltSoftSerial.h>
// GPS
#include <TinyGPS.h>
// GSM
static const int RXPin = 8, TXPin = 9;
AltSoftSerial SIM900A(RXPin, TXPin);
NeoSWSerial mySerial(5, 6);
TinyGPS gps;
void setup()
{
Serial.begin(9600);
SIM900A.begin(9600);
SIM900A.println("AT+CNMI=2,2,0,0,0");
mySerial.begin(9600);
delay(1000);
}
void loop()
{
bool newdata = false;
String buffer = readSIM900A();
if(SIM900A.available() > 0)
Serial.println(SIM900A.read());
if (buffer.startsWith("\r\n+CMT: "))
{
// printing the number
Serial.println(buffer.substring(9, 22));
// Remove first 51 characters
// buffer.remove(0, 51);
int len = buffer.length();
// Remove \r\n from tail
// buffer.remove(len - 2, 2);
// printing message
Serial.println(buffer.substring(51, len-2));
if (buffer.substring(51, len-2) == "location")
{
Serial.println("Sending location");
// GPS
if (mySerial.available())
{
char c = mySerial.read();
if (gps.encode(c))
{
newdata = true;
}
}
if (newdata)
{
long int lat, lon;
unsigned long age, age1, date, time, chars;
gps.get_position(&lat, &lon, &age);
gps.get_datetime(&date, &time, &age);
Serial.print("Lat/Long(10^-5 deg): ");
Serial.print(lat);
Serial.print(", ");
Serial.print(lon);
Serial.print(" Fix age: ");
Serial.print(age); Serial.println("ms.");
Serial.print("Date(ddmmyy): "); Serial.print(date); Serial.print("
Time(hhmmsscc): ");
Serial.print(time);
Serial.print(" Fix age: "); Serial.print(age);
Serial.println("ms.");
Serial.print("Alt(cm): "); Serial.print(gps.altitude());
Serial.print(" Speed(mps): "); Serial.print(gps.f_speed_mps());
// setting GSM module
SIM900A.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(1000); // Delay of 1000 milli seconds or 1 second
// sending location from which code word had come
SIM900A.println("AT+CMGS=\"" + buffer.substring(9, 22) + "\"\r"); //
Replace x with mobile number
Serial.println("AT+CMGS=\"" + buffer.substring(9, 22) + "\"\r");
delay(1000);
SIM900A.print("Lat/Long(10^-5 deg): ");
SIM900A.print(lat);
SIM900A.print(", ");
SIM900A.print(lon);
SIM900A.print(" Fix age: ");
SIM900A.print(age); SIM900A.println("ms.");
SIM900A.print("Date(ddmmyy): "); SIM900A.print(date);
SIM900A.print(" Time(hhmmsscc): ");
SIM900A.print(time);
SIM900A.print(" Fix age: "); SIM900A.print(age);
SIM900A.println("ms.");
SIM900A.print("Alt(cm): "); SIM900A.print(gps.altitude());
SIM900A.print(" Speed(mps): "); SIM900A.print(gps.f_speed_mps());
SIM900A.println((char)26);// ASCII code of CTRL+Z
delay(1000);
}
}
}
delay(100);
}
String readSIM900A()
{
String buffer;
while (SIM900A.available())
{
char c = SIM900A.read();
buffer.concat(c);
delay(10);
}
return buffer;
}
P.S : I have changed the pins for GSM and rest part is same. Except adding AltSoftSerial it is a library same as SoftwareSerial (Download it from manage libraries and it requires pins 8 and 9). Don't change pin number in sketch change the connections.