Counting number of turns

[tr6scott]

Originally Posted by Tem1514 Mentor

If you have been around since Logomotion the line tracking sensors will work to give you a simple rotation feedback for a 'slow moving' shaft.

I guess that depends on your definition of slow... Our frisbee shooter wheel ran at 3600 RPM direct coupled to CIM, with essentially the same photoeye from Banner as the AB line trackers. We also had three reflectors per revolution, to increase the "encoder" ticks. The cRio handles these speeds without issue.

http://www.chiefdelphi.com/forums/sh...d.php?t=105965

Edit: found the line tracker part number was/is 42EF-D1MNAK-A2 looking up the data sheet from AB shows a 1ms response time. For round numbers, say you only want to push it to 1 Rev per 5ms that still gets you to 12,000 RPM range.
We accurately recorded 5000rpm with 3 pulses per rev last year using the encoder class, last year with the banner sensor.