hi unable to receive & turn on & off relay using pic16f876a plz help me

[aviraje8]

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Code C - [expand]
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unsigned char sms_in[90];
bit flag;
unsigned int i=0;
void interrupt()
 {
  if (PIR1.RCIF==1)
  {
    if (UART1_Data_Ready())
   {
    sms_in[i] = UART1_Read();
 
    if(sms_in[i]=='K')
    {
   flag=1;
    }
    i++;
   }
 
  }
}
 
 
 
 
 
void main()
{
     INTCON.GIE = 1;
     INTCON.PEIE = 1;
     PIE1.RCIE=1;
 
     TRISC5_bit = 0;
     UART1_Init(9600);
     Delay_ms(500);
 
while(1)
{
 
if(flag==1)
     {
    char q=5;
    if(sms_in[q]=='O'&& sms_in[q+1]=='N'&& sms_in[q+2]=='1')
    {
     RC5_bit=1;
     UART1_Write(0X0D);
     UART1_Write(0X0A);
     flag=0;
      i=0;
    }
 
    else if(sms_in[q]=='O'&& sms_in[q+1]=='F'&& sms_in[q+2]=='F')
    {
     RC5_bit=0;
     UART1_Write(0X0D);
     UART1_Write(0X0A);
     flag=0;
      i=0;
    }
 
    }
   }
}

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[Pulsetronics]

Your code is Ok. I think its an Hardware Fault, Upload your circuit.

 

[shaiko]

I hope you're using a buffer and not trying to toggle the relay directly with an MCU gpio.
Post you circuit and the data sheet of the relay...

 

[aviraje8]

hi i am using sim900
if i receive SMS ON the relay should be ON
if i receive SMS OFF the relay should be OFF