PIC16f877A Sending SMS (AT commands) to Siemens C55

hello all, im new user in this forum

i want to explain my problems

first of all i learn AT commands and tested them with hyperterminal, i connected my siemens c55 to laptop with data-cable then i send commands. finally i send sms to my own mobilephone. But after write these command in C compiler my system didnt work. i want to share my proteus shematic and c code, could u help me pls!

C code is:

sorry i forgot to say someting what my project about, laser security system. microcontroller's 2.pin is my logic 1 and logic 0 input. At alarm level it is logic 1 and RED LED burning, in this position pic will send sms.

if it will only sends sms then make a function that will send the AT command for sending via serial...

example command

AT+CMGS="<mobile number here>" <ENTER command>
> <type your msg here><cntrl+Z command to send sms>

post your code here so that someone will help you..

Change line 23 to

unsigned char CMGS[]="AT+CMGS=\"+919123456789\"\r";

Replace +91923456789 with you number with country code
den add next line as

unsigned char SMS[]="Intrusion Detected";

Den replace lines 66 and 67 with this code

puts(CMGS);
delay_ms(500); // not checking the response
puts(SMS);
delay_ms(1);
putchar(0x1A); 

im not have a problem with AT commands, i send sms from siemens c55's memory and it's command is AT+CMSS=1 so my problem is, i cannot send my commands to mobile phone. There is no problem with sms sending, problem is serial communication pic to siemens c55 with C program.

@ galapacos
ru sending AT commands using Proteus compim model
if yes then remove max232 and connect compim directly to the pic pin
connect compin tx pin with pic tx pin in proetus only not in real
connect compin rx pin with pic rx pin in proetus only not in real

hi majoka, i want to send AT commands pic to compim. yea i try it with compim but i didn't find a solution. please look, this my compim connection. i can't simulate this project :S sometimes virtual terminal opens, sometimes don't. firstly i want to see "AT" at virtual terminal to understand that my c program is true or false. look at the red box which i paint, is there any problem with crystal because there are grey nodes?

ok ok i see the "AT" at virtual terminal it was wrong connection between 16f877 and virtual terminal pic's TX pin must go to virtual terminal's RX pin after that the phone will send "OK" then pic will send "AT+CMSS=1" (send 1.SMS on C55's memory).I will try this at breadboard thx

connect pic tx to compim tx and pic rx to compim rx
now compim is ok
now connect pic tx pin with rx pin of hyper terminal to see the results
u can use many virtual terminals and use it only to see data that in or out from compim
do not click on cross symbol on terminal window in this way next time terminal will not come
then u has to delete last one and drag a new

yea i saw the "AT"