How to calculate the Instruction Cycle time?

Projects Programming
1

I need to make a delay of , for instance, 180ms with high accuracy. If I make a subroutine like this, how much micro second delay I have to subtract it? Thanks.

void delay_subroutine(long timedelay){
while (timedelay > 16383){
delayMicroseconds(16383);
timedelay = timedelay-16383;
}
delayMicroseconds(timedelay);
}

2

You can use timer library. It will be useful when you are trying to run call function exact time .
Else use MSTIMER liberay to get control over function.

3

Thanks, I use micros() function and it is kind of ok.

Cheers

4

If you have an Arduino with a ceramic resonator rather than a quartz crystal the
+/-0.3% accuracy of ceramic resonator itself will dwarf any fiddle factor in your
loop.

Having said that waiting for micros() is a reasonable approach - the largest source
of error is the jitter caused by the timer0 interrupt handler (assuming a perfect
crystal timebase).