Digital Tach on an FPGA

[mittleiderj]

I am trying to implement a simple digital tach onto a machine. Its a proximity switch and a disk with several holes. I want to verify the disk is rotating and don't care (at least for the moment) how fast. I'm using a digital input on my 9074 FPGA and simply want to check for the digital transition over a set time period. Can someone please show me where I can find a sample vi that will accomplish this? Or does someone have a vi they could share?

Thanks

[Andrew_E · Accepted solution]

Hello,

Here is a DevZone with a link to example code for decoding Tachometer signals. Its using Analog Signals, but it shouldn't be hard to change it from analog signals to digital signals. Someone else on the forums may have implemented this with digital however.

Also check out the following Discussion forum.

Regards,

Andrew

Message Edited by Andrew_E on 07-17-2009 11:50 AM

[mittleiderj]

Thanks Andrew_E this looks like it will work. I appreciate the help.