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General => Technical support => Topic started by: gillecaluim on May 31, 2015, 05:11:57 PM

Title: using digital input to measure AC voltage frequency
Post by: gillecaluim on May 31, 2015, 05:11:57 PM

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?

Title: Re:using digital input to measure AC voltage frequency
Post by: garysdickinson on June 01, 2015, 11:13:05 AM

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.