Receiving sms with GSM modem and Pic16f887

[emufambirwi]

Hello

I have an A6 AI Thinker GSM Modem board. I have connected it to a pic16f887 and I can send an sms from it when certain conditions have been met in the PIC.
Now I want to use the same modem for controlling the turning on of an LED upon receiving the message 'ON' or 'OFF'. What is the logic for receiving the sms and comparing the received message to 'ON' or 'OFF' and acting accordingly? I am using MikroC for the compiler.

 

[Nigel Goodwin]

You can set the modem so that it sends the received text directly out the serial port (rather than storing it on the SIMM card), it's easiest to do that, and then just check the incoming text for the specific message you're looking for.

You might find this site of help?

https://circuitdigest.com/microcontroller-projects/gsm-interfacing-with-pic16f877a

 

[emufambirwi]

Ok thanks Nigel. Let me try that

 

[emufambirwi]

If anyone is interested I was able to achieve this.

 

[Diver300]

If anyone is interested I was able to achieve this.

You can post your code and results which would be more interesting that just saying it worked.

 

[emufambirwi]

You can post your code and results which would be more interesting that just saying it worked.

Here it is

char incchar;
char incoming[80];
char *result;              // command string search result
int i = 0;

void main() {
     PORTB = 0;
     TRISB = 0;              //RB0 input for interrupt
     PORTD = 0;
     TRISD = 0;                 //PORTD all output
     ANCON0 = 0x00;       // Configure PORTC pins as digital
     ANCON1 = 0x00;       // Configure PORTC pins as digital
     ANCON2 = 0x00;       // Configure PORTC pins as digital

  UART1_Init(9600);               // Initialize UART module at 9600 bps
  Delay_ms(100);                  // Wait for UART module to stabilize
  Delay_ms(2000);
  UART1_Write_Text("ATE0\r\n");   // AT command for Echo OFF
  Delay_ms(1000);
  UART1_Write_Text("AT\r\n");       // test GSM Modem
  Delay_ms(1000);
  UART1_Write_Text("AT+CMGF = 1\r\n");  //convert Sim900 module to text mode
  Delay_ms(1000);
  UART1_Write_Text("AT+CNMI=1,2,0,0,0\r\n"); // setup receiving (now important at this stage)
  Delay_ms(1000);
 

while (1) {                     // Endless loop
    if (UART1_Data_Ready()) {     // If data is received,
    for (i= 0; i < 80; i++)   {
      incchar = UART1_Read();     // read the received data,
      incoming[i]  = incchar;
      }
    if (result = strstr (incoming, "ON"));          // search for string "ON" in incoming and save it in result
    if (memcmp("ON", result, 2) == 0)
    
               {
                         PORTB.F0 = 0x01;

                         PORTB.F1 =0x01;
               }
    if (result = strstr (incoming, "OFF"));          // search for string "OFF" in incoming and save it in result
    if (memcmp("OFF", result, 3) == 0)
             {
                         PORTB.F0 =0x00;
                         PORTB.F1 =0x00;
              }

    }
    }
    }