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Markdem
Joined: 24 Jun 2005
Posts: 206
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| Quick timer program problem |
 Posted: Fri Sep 23, 2005 8:14 am |
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Hi All, i am tring to write a very simple timer program, but am having some problems. It is ment to turn on a relay when i press and hold a buttion, and the delay the turnoff but some time (2 seconds in this example). This all works ok, however, if i repress the buttion within the timout priod it will not delay when i let go again. It will just stay on as long as i hold the buttion, but will turn off as soon as i let go. If i let the relay turn off before pushing the buttion, it will work OK.
My code is below
Thank you for your help
Mark
| Code: |
#include <12F629.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOCPD, NOPROTECT, NOMCLR, NOPUT, BROWNOUT
void main() {
OUTPUT_low(pin_A0); //make sure blower is off
while(1)
{
while (input(pin_A2)); //Wait untill buttion is pressed
{
output_low(pin_a0);
}
while (!input(pin_A2)); //turn blower on if buttion is pressed
{
output_high(pin_a0);
delay_ms(2000);
}
}
}
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Fri Sep 23, 2005 8:37 am |
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You put ';' after the while statements. This is what your code actually looks like:
| Code: | #include <12F629.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOCPD, NOPROTECT, NOMCLR, NOPUT, BROWNOUT
void main() {
output_low(pin_A0); //make sure blower is off
while(1)
{
while (input(pin_A2)); //Wait untill buttion is pressed
output_low(pin_a0);
while (!input(pin_A2)); //turn blower on if buttion is pressed
output_high(pin_a0);
delay_ms(2000);
}
}
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This is what you probably want
| Code: | #include <12F629.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOCPD, NOPROTECT, NOMCLR, NOPUT, BROWNOUT
void main() {
while(1)
{
// Blower off
output_low(pin_a0);
// Wait until button is pressed
while (input(pin_A2));
// Blower on
output_high(pin_a0);
// 2 second delay after button release
while (delaycount < 2000)
{
delay_ms(1);
// Keep delaying until button is released
if (!input(pin_A2))
delaycount = 0
else
delaycount++;
}
}
}
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