RPM on digital input line?

[JMBacker]

I'm writing a vi that reads various frequencies.  I'm reading from a USB-6229 board which says it has hardware timed digital I/O.  I've used both of my counter inputs, and I need to take more RPM readings.  I'm trying to figure out how to use my Digital Input lines to read frequency/RPM.  I found an example (attachment) that works for me using an analog input, but I need it to use the digital input, all my analog inputs are tied up.  I've tried modifying it to fit, but can't seem to figure it out.  Can anyone help?

I can get it to work at high frequencies (attachment #2) but it won't read at lower frequencies due to not enough samples to determine a frequency.  If I try to increase the samples, I get an onboard device memory overflow error, # -200010.  How can I collect more samples?  Or maybe I'm just going about this completely wrong?

Thanks for any help...

[JB]

Duplicate post !

[Brooks_C]

This is a duplicate post. Please refer to this link for further information.

In order to maintain the forums in an orderly manner and to keep problem solutions and information in a consolidated fashion easily searchable by customers, duplicate posts are often linked. Best of luck in future applications.