Problem connecting pic18f452 with wavecome modem through max232

[engshahrul]

sir i have the modem sending message to my handphone via the modem already......now i just need to adjust the code so that when i send sms to the modem, the mcu reads it and turns on the alarm.....i do not know how to do that......sir do u know any example code that i can use as refference?

This is related project, GSM Switch and this is GSM Lesson code.

 

[ckshivaram]

check this discussion...
https://www.edaboard.com/threads/210322/

 

[lifiq]

i have done this code for my project......when i send sms "ALARM" my buzzer will turn on and if the switches 1 and 2 are high it will notify me through sms "INTRUDER".... the intruder part works fine....but im not able to compile the ALARM part ...when i compile it says not enough parameters.....what am i doin wrong? i just want the pic to read sms from sms location 1 and if it reads ALARM then it will turn on the buzzer...here is my code pls help me guys...





#define intruder PORTB.f7
#define button_ON PORTB.f6
#define blockcar PORTD.f7
#define alarm PORTD.f6

void main()
{
trisb = 0xff; // SET PORTB AS INPUT
portd = 0x00; // SET INITIAL VALUE FOR PORTD
trisd = 0x00; // SET PORTD AS OUTPUT
UART1_Init(9600); // SYNCHRONIZE BAUDRATE WITH HANDPHONE
Delay_ms(100);
trisc.f7 = 1; // SET Rx DATA IN
trisc.f6 = 0; // SET Tx DATA OUT

while(1)
{
ON:
while(1)
{blockcar=0;
if(button_ON==0)
{
UART1_WRITE_TEXT("AT+CMGD=1,4");
UART1_WRITE(0X0D);
goto ON;
}
else if (button_ON==1)
{
UART1_WRITE_TEXT("AT+CMGR=1");
UART1_WRITE(0X0D);
UART1_Read_Text( "ALARM");
goto ALARM
}
else
{ goto INTRUDER;
}
}
ALARM:
while(1)
{alarm=1;
if (button_ON==0) // WAIT FOR USER INTERRUPT
{goto ON; // BACK TO START AFTER USER INTERRUPT
}
}
INTRUDER:
while(1)
{ if((button_ON==1)&&(intruder==1))
{
blockcar=1;
goto SSMS;
}
}
SSMS:
while(1)
{ UART1_Write_Text("AT+CMGS=");
UART1_Write(0x22); // "
UART1_Write_Text("+60125920540"); // My cellphone no here
UART1_Write(0x22); //"
UART1_Write(0x0D) ; //<CR> mean (Enter)
UART1_Write_Text("INTRUDER"); // my Text
UART1_Write(26); // Ctrl+Z
UART1_Write(0x0D); //<CR> mean (Enter)

goto USERINT; // GO TO BLOCKING CAR
}
USERINT:
while (1)
{ blockcar=1; // BLOCKING THE CAR
if (button_ON==0) // WAIT FOR USER INTERRUPT
{goto ON; // BACK TO START AFTER USER INTERRUPT
}
}
}
}

 

[ckshivaram]

you should not use so many while (1) loops in a program... its difficult to maintain the stack for them...

---------- Post added at 19:45 ---------- Previous post was at 19:33 ----------



you should send 0x0a and 0x0d in combination which is equivalent of "ENTER"... I dont see that..

---------- Post added at 19:46 ---------- Previous post was at 19:45 ----------

you have not set the message format of AT+CMGF ?????????????//

 

[lifiq]

i just need the main code for reading a specific sms message example alarm and then turning an output high. i do not want to change the code much because the sending sms to mobile part is fine............

does this code work
UART1_READ_TEXT("ALARM","OK",80);
alarm=1;

alarm is defined as ouput on pin d6;
DOES THIS MEAN WHEN THE PIC READS ALARM IN THE SMS MESSAGE IT WILL TURN ON

 

[engshahrul]

does this code work
UART1_READ_TEXT("ALARM","OK",80);
alarm=1;

It's not straight forward like that. Read the AT Command manual.

Your handphone send SMS, then GSM receive, PIC will receive AT+CMTI
Then PIC read the SMS by sending command AT+CMGR=1. 1 is SMS location, it also can be 2,3 or what any number.
But, what I do, I delete SMS location 1 at the beginning, so I always can read SMS location 1.

See this 2 example GSM Signboard and GSM Switch.

 

[lifiq]

ok then ill put AT+CMTI for pic to understand that a new message has arrived and then AT+cmgr=1 for the pic to read the message at location 1 but what code do i use for pic to understand let say the word "alarm" and then gives a high on its outputs?

 

[engshahrul]

ok then ill put AT+CMTI for pic to understand that a new message has arrived and then AT+cmgr=1 for the pic to read the message at location 1 but what code do i use for pic to understand let say the word "alarm" and then gives a high on its outputs?

Read the AT Command manual, when you send AT+CMGR=1, then what GSM Modem will reply.
This reply is the example: +CMGR: “REC UNREAD”,”0146290800”,”98/10/01,18:22:11+00”,<CR><LF>ABCdefGHI OK

Then you need to process this string.

 

[lifiq]

abang i need help in doing the string.......the examples u gave has none of those......i know when i give AT+CMGR=1 i will get the info as above.....i have already tested with hyperterminal......i have also tested my pic with hyperterminal.....at+cmgd and at+cmgr works but i do not know how to write the code for the pic to understand the alarm command from the sms message and give a high on it input.....tolong la abang im so close already

 

[engshahrul]

abang i need help in doing the string.......the examples u gave has none of those......i know when i give AT+CMGR=1 i will get the info as above.....i have already tested with hyperterminal......i have also tested my pic with hyperterminal.....at+cmgd and at+cmgr works but i do not know how to write the code for the pic to understand the alarm command from the sms message and give a high on it input.....tolong la abang im so close already

That you need to study all in my blog.