using digital input to measure AC voltage frequency

[gillecaluim]

I'm trying to use a Nano to measure the heat generation by a solar water capture system.  I was going to use the two AC inputs for input/output temperatures and have a paddle wheel flowmeter which generates a triangle wave 3VAC output where the frequency is linearly related to flow rate.
Can I directly connect the flowmeter output to one of the digital inputs to measure the frequency or do I need to do some signal conditioning?

[garysdickinson]

The Nano-10 digital inputs cannot directly handle a 3 VAC input.  You will need some signal conditioning to convert this signal to something that the PLC can handle.

If you can provide a link to the data sheet for this sensor, I might be able to help you figure out what it will take to get this flow sensor working with the PLC.

Gary D___kinson
Substitute "ick" for "___" and you'll get my family name.