Converting milliseconds to frequency

[Andy Wood]

With my millisecond values are integers, I don't expect 100% accuracy. Using PBP, how do I get from say, 16mS to 62Hz ?

Scott

Time and Frequency are reciprocal, so you can use a constant (in this case 1000) and divide you mS value into it. For example:

1000 / 16mS = 62Hz.

Or if you had 40mS -

1000 / 40mS = 25Hz etc.

You are probably kicking yourself right about now

Regards,

Andy

[Kamikaze47]

That would work, but that kind of division in PBP would take up a lot more processing time than the IF...THEN statements above.

[RussMartin]

I may not be understanding something here.

For the basic math, I would have said:

rpm=60000/z

where z is in milliseconds.

That would work, but that kind of division in PBP would take up a lot more processing time than the IF...THEN statements above.

My question is: Why would doing that single division take longer than going through multiple IF...THEN statements (40-something of them in the example) until one is found where the condition is satisfied?

Thanks to whomever clarifies this for me!

[chips123]

Thanks Andy.....kick, kick, kick...
And Russ...equally good insight. I'll kick myself once for you too.
Almost too obvious, I have been away from math for too long.

Kamikaze...I tried your solution and ran into an exceeded address 3fff, if I remember correctly. I got sidetracked and have not investigated that further yet.

Appreciate the input.
Scott