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How using a arduino in LabView to show the FFT of a sensor output voltage signal (NEED HELP)

I created code to show the FFT of an output signal of a sensor digitalized  by arduino. And it works fine but it works when I connect physically the sensor which is good. But I cannot prove how it works without it , I want someone to help me find a way to test my code with kind of signal generator VI that can be used to se how precise my code works. Yes it does work. 

 

This is the codeThis is the codeWhen I connect the sensor (+ arduino) it worsk showing the FFT in "real time"When I connect the sensor (+ arduino) it worsk showing the FFT in "real time"

By the way the code I use for the arduino is the following:

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

void loop() {
  Serial.println(analogRead(A0));
}

and the sensor I connect is a hall sensor and I move a magnet in a oscillatory way. please your help!! 

 

Need to find a way in code to prove that the VI works.And what is measuring is right. Any question or specific idea let me know. I tried everything but i find lots of problems related to incoherencies with the data type and among others.

 

 

 

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