mahmood Elnasser wrote:
-------------------------------

Lets do some maths:
15,000 rpm = 2500 rps assuming you are getting 1 pulse per revolution.


Are you sure?

My maths teacher told me that 15000/60=250....



someone must be wrong here ;-)

If I am right then at 1 pulse per rev, you get 250 pulses per second... That's a frequency of 250 Hz...

(see also Steve's posts...)

It's not the microcontroller that is not properly dimensioned... (I think)
regards
Patrick