Arduino analog read pin to frequency

[Craig_]

Hey Y3G,

Your questions are getting harder !

How do you know the input signal is at 200Hz? Do you know the accuracy of the Arduino's internal oscillator?

The FFT should be using all of the samples provided.

Feeding a simulated 200Hz signal into the FFT provides great results:

Regards,

[Y3G]

Ok,

Hope I don't being annoying on this...

So it is not the FFT for sure, but what does it say about the ARDUINO.vi?

Why does the Arduino not indicate the righ frequency input?

Is it because of the limited bit-resolution (10 bits)? The internal clock freq is some MHz...

Have you thought about ARDUINO.vi to sample faster than 5 kHz?

Any Soundcard can sample at least 44.1 kHz.  

Thanks,

Y3G

[Craig_]

I'm not sure about the arduino firmware at all.

All the Arduino toolkit does is send VISA commands to an Arduino. The firmware that you load onto it provides the communications API for those commands. I don't know why they chose 5kS/s acquisition rate but it's probably related to CPU and Serial bus limitations or even device compatibility.

It's pretty easy to spin your own Arduino firmware, and code it to respond to serial commands if you want more control of things.

At any rate you'll probably get more helpful responses if you post to the Arduino Community group here: https://decibel.ni.com/content/groups/labview-interface-for-arduino

Have a nice day!