I’m wanting to hook up an anemometer to the RIO digital input as a counter, and am wondering if the frequency will be too high for the RIO to accurately count.
Each revolution opens and closes a digital contact 2-4 times, so an RPM of 100 works out to once every maybe 200ms. Is that too fast for the digital counter in the RIO?
Should be fine - counter points are good for 10kHz.
Hi Loren, according to the spec published inside the groov RIO, Discrete Counter inputs can handle up to 10 KHz so you should be fine!
This is similar to a project I did several years ago. I used an Anemometer from https://texaselectronics.com/products/wind-speed-direction/tv-114-wind-speed.html
I used a standard DC input with an EB1 brain and set up the input for frequency measurement, then all I had to do was divide the frequency by a constant to find MPH. Even at 20 pulses per revolution I never had any issues. The OPTO 22 equipment worked like a champ, granted I did this with SNAP instead of EPIC RIO, so your situation could be different.