Simple measurement of an encoder?

[jeff_scharpf]

Sorry if this is redundant. I've searched here and the examples. I see several examples that measure quadature encoders and do period measurements, but I am wondering if there is some very simple logic to do the following:

Count the number of rising edges

Keep track of the time

At a specific time interval (user controlled) display the total counts

Reset the counts and the timer and start again.

I just want to know the number of pulses that I saw over xx microseconds.

For whatever reason I'm having a brain block lol. This should be very simple.

I'm using the FPGA of a cRIO and a 9411 card. It does have the quadature inputs connected but I don't think I need any more than one channel.

In the end I will be calculating velocity with a user defined time interval.

Jeff

[preston_johnson]

Have you looked at the shipping examples

c:\program files\national instruments\labview 8.2\examples\compactrio\fpga fundamentals\counters

Let us know if these work for you

[jeff_scharpf]

Perfect! I knew that there would be an example somewhere in there 🙂

Thanks!

Jeff