help regarding sim300 receive sms+arduino uno

[kunal123]

hi,
can anyone suggest sample source code to display received sms by sim300 on serial port using arduino, please reply me asap.

thanks

 

[balucyber124]

hi ,
it is simple you will have receive buffer register right you can use that and display the text. use at+cmgr with index to read the data using gsm module


regards
bala krishna

 

[kunal123]

ya correct, but i unable to get new message notification, the AT+CNMI is command for new message notification but how i can use this command

 

[sathshya]

ya correct, but i unable to get new message notification, the AT+CNMI is command for new message notification but how i can use this command

hi kunal,
This is the simple example for receiving and read SMS.I hope that it will help you,


void switchModule(){
digitalWrite(onModulePin,HIGH);
delay(2000);
digitalWrite(onModulePin,LOW);
}

void setup(){

Serial.begin(115200); // UART baud rate
delay(2000);
pinMode(led, OUTPUT);
pinMode(onModulePin, OUTPUT);
switchModule(); // switches the module ON

for (int i=0;i < 5;i++){
delay(5000);
}

Serial.println("AT+CMGF=1"); // sets the SMS mode to text
delay(1000);
}

void loop(){


Serial.println("AT+CMGR=1"); //Reads the first SMS
Serial.flush();
for (x=0;x < 255;x++){
data[x]='\0';
}
x=0;
do{
while(Serial.available()==0);
data[x]=Serial.read();
x++;
if(data[x-1]==0x0D&&data[x-2]=='"'){
x=0;
}
}while(!(data[x-1]=='K'&&data[x-2]=='O'));

data[x-3]='\0'; //finish the string before the OK

Serial.println(data); //shows the message

delay(5000);

}

 

[kunal123]

hi sathshya,
u suggested code is not worked for me, i tryed on hyper terminal as follows
at
OK
at+csq
+CSQ: 99,99

OK
at+creg=1
OK
at+cmgf
+CREG: 1
=1
OK
at+cmgf=1
OK

+CMTI: "SM",21
at+cmgr=21
+CMGR: "REC UNREAD","+917738995895",,"12/10/05,17:14:24+22"
Hi

OK
if i send another message from cell phone to sim300 gsm module, module give me responce as
+CMTI: "SM",22
then read message at sim memory location 22

i have to do like above sequence