Watch Video Demonstration Carefully Till End -- Control LED'S Using Arduino with SIM800L DTMF and SMS feature
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SCHEMATIC DIAGRAM:
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FINAL SOFTWARE CODE:
#include <SoftwareSerial.h>
// defining communicationion pins for Software Serial
# define GSM_RX 7 // Connect TX of GSM module
# define GSM_TX 6 // Connect RX of GSM module
// Defining interfacing pins for Relay board
# define RELAY_1 A0
# define RELAY_2 A1
SoftwareSerial gsm_board(GSM_RX,GSM_TX);
boolean call_flag=0, relay_flag=0;
int i=0,j=0,x=-1;
char n[3];
void gsm_initilaize();// used to inilitize the gsm and chk all its parameters
void relay(); // used to control relay outputs.
void setup()
{
// put your setup code here, to run once:
gsm_board.begin(9600);
Serial.begin(9600);
pinMode(RELAY_1,OUTPUT);
pinMode(RELAY_2,OUTPUT);
digitalWrite(RELAY_1,LOW);
digitalWrite(RELAY_2,LOW);
gsm_initilaize();
}
//////////////////////////////setup ends/////////////////////////////
/////////////////////loop begins///////////////////////////
void loop()
{
String gsm_data; // to hold incomming communication from GSM module
while(gsm_board.available())
{
char c=gsm_board.read();
gsm_data+=c;
delay(10);
} //read serial data and store it to gsm_data STRING instance;
if(!call_flag) // if call is not in connected, checking for ring
{
x=gsm_data.indexOf("RING");
if(x>-1)
{
delay(5000);
gsm_board.println("ATA");
call_flag=1;
}
} // ring test over, call flag high if sim rings
if(call_flag) // if call is connected
{
x=gsm_data.indexOf("DTMF"); //checkinh dtmf and storing approprietly
if(x>-1)
{
n[j]=gsm_data[x+6];
Serial.println(n[j]);
j++;
}
x=gsm_data.indexOf("NO CARRIER"); // Checking whether call is still connected or not
if(x>-1)
{
gsm_board.println("ATH");
relay_flag=1;
call_flag=0;
j=0;
}
}
if(relay_flag) // If a call was resently disconnected, changing relay states accordingly
{
relay();
}
}
//////////////////////////////loop ends/////////////////////////////
/////////////////////gsm inilitize begins///////////////////////////
void gsm_initilaize()
{
boolean gsm_Ready=1;
Serial.println("initializing GSM module");
while(gsm_Ready>0)
{
gsm_board.println("AT");
Serial.println("AT");
while(gsm_board.available())
{
if(gsm_board.find("OK")>0)
gsm_Ready=0;
}
delay(2000);
}
Serial.println("AT READY");
// GSM MODULE REPLIED 'OK' TO 'AT' INPUT, INDICAING THE MODULE IS OK AND FUNCTIONING
boolean ntw_Ready=1;
Serial.println("finding network");
while(ntw_Ready>0)
{
gsm_board.println("AT+CPIN?");
Serial.println("AT+CPIN?");
while(gsm_board.available())
{
if(gsm_board.find("+CPIN: READY")>0)
ntw_Ready=0;
}
delay(2000);
}
Serial.println("NTW READY");
// GSM MODULE REPLIED '+CPIN:READY' TO 'AT+CPIN?' INPUT, INDICAING THE NETWORK IS OK AND FUNCTIONING
boolean DTMF_Ready=1;
Serial.println("turning DTMF ON");
while(DTMF_Ready>0)
{
gsm_board.println("AT+DDET=1");
Serial.println("AT+DDET=1");
while(gsm_board.available())
{
if(gsm_board.find("OK")>0)
DTMF_Ready=0;
}
delay(2000);
}
Serial.println("DTMF READY");// GSM MODULE REPLIED '+OK' TO 'AT+DDET=1?' INPUT, INDICAING THE DTMF IS ON;
}
//////////////////////////////gsm inilitization ends/////////////////////////////
/////////////////////relay begins///////////////////////////
void relay()
{
if(n[0]=='1') // if RELAY_1 was selected
{
if(n[1]=='1')
{
digitalWrite(RELAY_1,HIGH); //relay 1 on
Serial.println("RELAY 1 ON");
}
else if(n[1]=='2')
{
digitalWrite(RELAY_1,LOW);// relay 1 off
Serial.println("RELAY 1 OFF");
}
}
else if(n[0]=='2') // if RELAY_2 was selected
{
if(n[1]=='1')
{
digitalWrite(RELAY_2,HIGH); // realy 2 on
Serial.println("RELAY 2 ON");
}
else if(n[1]=='2')
{
digitalWrite(RELAY_2,LOW); // relay 2 off
Serial.println("RELAY 2 OFF");
}
}
relay_flag=0;
}
/////////////////////relay ends///////////////////////////
