PWM using PIC18F

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  • March 13, 2015 at 2:41 pm #11037
    PN
    Participant

    I want to program PIC18F such that with push button 1 pressed, the relay/LED is on for 1 sec, off for 2 sec continuously unless button 2 pressed , in which relay/LED will be on for 2.5 sec and off for 5 sec. How to achieve this? I tried giving delay (as given below) but when i press RD1 it does not recognize. I want PIC to change timing whenever i press other button.

    while(1)
{
  if(PORTD.RD0==0)
  {
    PORTB.RB0=1;
    delay_ms(2500);
    PORTB.RB1=0;
    delay_ms(5000);
    if(PORTD.RD1==0)
    {
      //condition of while RD0 becomes false
      //start a different delay
    }
  }
}
    March 22, 2015 at 7:51 pm #11106
    Ligo George
    Keymaster

    You can program like this :

    .............
.............
TRISD.F0 = 1;
TRISD.F1 = 1;
.............
.............
while(1)
{
  while(PORTD.F0 == 0)
  {
     LATB.F0 = 1; // Use LAT register to write output in 18F
     Delay_ms(1000);
     LATB.F0 = 0;
     Delay_ms(2000);
  }
  
  while(PORTD.F1 == 0)
  {
    LATB.F0 = 1;
    Delay_ms(2500);
    LATB.F0 = 0;
    Delay_ms(5000);
  }
}
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