[SOLVED] On and off pwm wave at output of pic controller using single button

[RONY11]

On and off pwm wave at output of pic controller using single button

i connected other 2 button for increment and decrement
but when i push off button then pwm must start after push same on/off button

 

[ogulcan123]

On and off pwm wave at output of pic controller using single button

i connected other 2 button for increment and decrement
but when i push off button then pwm must start after push same on/off button

Hi,

Are you using assembly language? Can you share the corresponding code? I believe it is a software problem.

Ogulcan

 

[RONY11]

while(1)
  {
    if(KEY_1==1  && i<1000)
    {
    
        i=i+20;
    
    }
     
    else if(KEY_2==1 && i>0)
    {
        i=i-20;
    
    }    
    
    else if(KEY_3==1)
        
    {
        i=800;
    }
    else if( KEY_4==1 )
    {
        
        while(1)
        {
         j=1;
        i=0;
        PWM1_Duty(i);
        
        }
       
    }
        
       WHEN I PRESS KEY_4  DUTY CYCLE GO TO 0 AND PROGRAMME REMAIN IN THAT WHILE LOOP....TELL ME PLS HOW TO GET OUT FROM THAT SMALL WHILE LOOP WHEN I PRESS SAME KEY_4...........THIS IS FOR ON AND OFF PWM OUTPUT USING SAME KEY_4 
        
        
        
        
        
    PWM1_Duty(i);
    __delay_ms(100);
  
  }

 

[KlausST]

Hi,

I recommend to generate the PWM with the built in hardware. It generates fixed and clean timing for your PWM without processing power.
So your program just needs to check key status.

This solves your problem doing multiple timing critical tasks at once.

Klaus

 

[FvM]

I recommend to generate the PWM with the built in hardware

I presume the latest code already does with statement pwm1_duty().

First step should be to remove the inappropriate inner while(1) loop. Secondly implement a toggle variable which changes between 1 and 0 on consecutive KEY_4 presses.