SIM900D sending and receiving message using PIC16f84a

[dark_ages]

hi fellows...
we're on our final year in college and we've come up with an SMS based project. we need some help regarding on how to connect the SIM900D to the microcontroller and some codes in MPLAB IDE to controll the gsm modem.

any good help will be much appreciated....

 

[ckshivaram]

Search this forum... i have already repeated this procedure many times

 

[dark_ages]

i've search the forum but i found nothing. will you just answer it? pls. i really need it. tnx a lot.

 

[ckshivaram]

could you test it with hyperterminal all the commands properly

 

[dark_ages]

i haven't tried it yet...i have read some page about testing it with the hyperterminal but the gsm modem there is not the sim900d, its benQ i think and it has a serial port in order to connect to the computer.
In case of sim900d, it doesn't have any serial port.

How could I test it?

 

[seadolphine2000]

As I can see from this datasheet www.soselectronic.hu/a_info/resource/c/SIM900D.pdf
The module is has a UART interface, and SPI interface.
You can use any of these interfaces.

 

[ckshivaram]

simcom modems are all same and most of the AT commands are same....
you can test it with serial port and terminal and become aware of at commands and then start the program

 

[dark_ages]

sir....do you have any assembly codes in mplab there that can be used to enable the sim900 to text?to turn on?and to filter the messages that is received by the sim900?

 

[zula]

you will talk to sim900d with UART. so you have to implement uart module. then you will send AT commands.

by the way, if you design your custom board, just keep in mind the PWRKY pins for the wake up sim900d.

 

[dark_ages]

now were using mikroC for our project,
but when I use the command Usart_Init(9600), Usart_Read_Text(), or Usart_write, it only provides me with errors,
but when i coded UART1_Write,UART1_Init(9600), and any other commands, it is accepted.
is there any initialization to be done first before using Usart commands?

 

[seadolphine2000]

You have to include the library in your project. There is a panel with the libraries those can included in your project, you have to select the "USRAT" library.

 

[dark_ages]

I'll try it...tnx a lot.....
another problem that i have encountered is that when I code:
void main(){
while(1){
if(UART1_Read_Text=="System On"){
......................
................................
}
.
.
.
.
}
}
what should I COde?
can u please send me some examples of sending and receiving sms mikroC code....
just email it to sajo_christian@yahoo.com....tnx a lot.

 

[muwasif]

you can send AT command on usart port like



const unsigned char at[]= "AT\rAT+CMGF = 1\rAT+CSCA =\"+<message center #>\"\rAT+CMGS =\"<Mobile #>\"\;
char msg[] = {"Test Message"};
Usart_Init(9600);// baud rate
i=0;
do {
Usart_Write(at);
} while (at[i++]!=0);
i = 0;

do {
Usart_Write(msg);
} while (msg[i++]!=0);
i = 0;
Usart_Write('\x1A'); //Clt+Z

i = 0;

}