simple question arduino code

Projects Programming
1

Hello
I'm trying to output a signal for a certain time: 0.5 milliseconds
I'm using the arduino. I output in pin_9, when the pin_12 is HIGH
pin_9 is HIGH for only 0.5 milliseconds

when I use the time delay with 1 ms, it outputs correctly
but if I use a time delay below 1 ms (that is the my case)
it outputs only for a few MICRO seconds......

do you know why it happens?
thanks

2

You cannot delay() with fractional values.

Use delayMicroseconds(500) instead.