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alvinlollo
2026-09-25 10:48:51 +10:00
commit b90beea8ae
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libraries/Adafruit_Zero_FFT_Library/examples/normalized/normalized.ino
+50
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@@ -0,0 +1,50 @@
/* This example shows how to calculate an FFT an normalize it.
*
* The signal.h file constains a 200hz sine wave mixed with a weaker 800hz sine wave.
* The signal was generated at a sample rate of 8000hz.
*/
#include "Adafruit_ZeroFFT.h"
#include "signal.h"
//the signal in signal.h has 2048 values. Set this to a value from 16 to 2048.
//this must be a power of 2
#define DATA_SIZE 1024
//the sample rate
#define FS 8000
//this array will hold the normalized data
float normalized[DATA_SIZE/2];
// the setup routine runs once when you press reset:
void setup() {
Serial.begin(115200);
while(!Serial); //wait for serial to be ready
//run the FFT
ZeroFFT(signal, DATA_SIZE);
//get the maximum value
float maxVal = 0;
//data is only meaningful up to sample rate/2, discard the other half
for(int i=0; i<DATA_SIZE/2; i++) if(signal[i] > maxVal) maxVal = signal[i];
//normalize to the maximum returned value
for(int i=0; i<DATA_SIZE/2; i++)
normalized[i] = (float)signal[i] / maxVal;
for(int i=0; i<DATA_SIZE/2; i++){
//print the frequency
Serial.print(FFT_BIN(i, FS, DATA_SIZE));
Serial.print(" Hz: ");
//print the corresponding FFT output
Serial.println(normalized[i]);
}
}
void loop() {
//don't even do anything
}
libraries/Adafruit_Zero_FFT_Library/examples/normalized/signal.h
+214
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@@ -0,0 +1,214 @@
#ifndef _SIGNAL_H
#define _SIGNAL_H
#include "Adafruit_ZeroFFT.h"
q15_t signal[] = {
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};
#endif