PIC16F877A PUSH BUTTON - electroSome

Tagged: 16F877A, PIC, Push Button, Switch

This topic has 3 replies, 2 voices, and was last updated 9 years, 10 months ago by Ligo George.

Viewing 4 posts - 1 through 4 (of 4 total)

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January 27, 2015 at 3:17 pm #10616
namratha
Participant
hi am working on pic16f877a , have interfaced pushbutton . If the button is pressed once value will increment by 1 . But, if I press down and hold for long time value should increment fastely . Below is the code for button and am using XC8 complier.
```
void main()
{
  int oldstate;
  oldstate = 0;
  while(1)
  {
    if(RA4 == 1)              // switch
    {
      oldstate = 1;           // update flag
    }
    if(oldstate &&(RA4 == 0))
    {
      val++;
      if(val > 10)
      {
        val = 1;
      }
      oldstate = 0;            // update flag
    }
  }
}
```
January 27, 2015 at 5:21 pm #10622
Ligo George
Keymaster
Hello, use like this
```
if(button pressed)
{
  __delay_ms(250);
  if(still button pressed)
  {
    //Increment variable here
  }
}
```
This will work for single press and long press.
January 27, 2015 at 5:52 pm #10623

namratha
Participant

Thanks George.., will try it out …

January 28, 2015 at 10:40 am #10626
Ligo George
Keymaster
If you want fast incrementing, use like this.
```
if(button pressed)
{
  __delay_ms(250);
  while(still button pressed)
  {
    //Increment variable here
  }
}
```
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