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i sure i m using 20Mhz crystal !!!
1 instruction = 4 clock cycle
time for 1 instruction=20 M/4 = 5 MHz
(unsigned long data) 5,000 x (my delay)1,000,000 = 5,000,000,000
5,000,000,000 / 5,000,000 cycles per second = 1000 seconds!
my calculation correct?
but result show is 5seconds???
void main()
{
unsigned long delay_time=5000;
for(;;)
{
if(SW1==0)
{
out=1;
delay(1000000);
out=0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
this delay(1000000) is around 5 seconds
i m using 20MHz crystal...
my project is moving a car in and out
SW1 ON = car moving out for 5 second then automatic stop
SW2 or sensor ON=car go in for 5 second then automatic stop
when sensor OFF car will go out for 5 second then automatic stop
<<problem is i just allow this car stop at outside just for 30 second then...
for example i switch on a LED for 5 second then turn off for 5 second.
i keep repeating this process. now i want the LED just can turn on in total time of total 30 second(total 6 time off my process just now), then the LED wont be light on after this 30 second.
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