gsm sms and call .ino

//EDISON SCIENCE CORNER
//www.esclabs.in



#include <SoftwareSerial.h> 
SoftwareSerial GSM(11, 10); //SIM800 Tx & Rx is connected to Arduino 

char phone_no[]="+919074213906"; //your number with country code


#define bt_C  A1 // Button2 Pin A1 use for sos
#define bt_S  A0



void setup(){

Serial.begin(9600);
GSM.begin(9600);   

pinMode(bt_C, INPUT_PULLUP);
pinMode(bt_S, INPUT_PULLUP);


  
Serial.println("Initializing....");
initModule("AT","OK",1000);                //Once the handshake test is successful, it will back to OK
initModule("ATE1","OK",1000);              //this command is used for enabling echo
initModule("AT+CPIN?","READY",1000);       //this command is used to check whether SIM card is inserted in GSM Module or not
initModule("AT+CMGF=1","OK",1000);         //Configuring TEXT mode
initModule("AT+CNMI=2,2,0,0,0","OK",1000); //Decides how newly arrived SMS messages should be handled  
Serial.println("Initialized Successfully"); 

}

void loop(){


if(digitalRead (bt_C) == 0)
{
  callUp(phone_no);
  delay(1000);
}

if(digitalRead (bt_S) == 0)
{
 sendSMS(phone_no,"emergency alert");;
  delay(500);
}

delay(5);
}



void sendSMS(char *number, char *msg){
GSM.print("AT+CMGS=\"");GSM.print(number);
GSM.println("\"\r\n"); 
delay(500);
GSM.println(msg); 
delay(500);
GSM.write(byte(26)); 
delay(500);  
}

void callUp(char *number)
{
GSM.print("ATD + "); 
GSM.print(number); 
GSM.println(";"); 
delay(20000);       
GSM.println("ATH"); 
delay(100);  
}


void initModule(String cmd, char *res, int t){
while(1){
    Serial.println(cmd);
    GSM.println(cmd);
    delay(100);
    while(GSM.available()>0){
       if(GSM.find(res)){
        Serial.println(res);
        delay(t);
        return;
       }else{Serial.println("Error");}}
    delay(t);
  }
}