【花雕动手做】有趣好玩的音乐可视化系列小项目(08)---四位32段点阵屏
项目之三:红绿色32段级联频谱点阵屏灯(FFT算法)
实验开源代码
/*
【花雕动手做】有趣好玩的音乐可视化系列小项目(08)---四位32段点阵屏
项目之三:红绿色32段级联频谱点阵屏灯(FFT算法)
接脚连线:MAX9814 接A0
MAX7219 UNO
VCC →→→→→ 5V
GND →→→→→ GND
DIN →→→→→ D11(数据,数据接收引脚)
CS →→→→→ D10(负载,命令接收引脚)
CLK →→→→→ D13(时钟,时钟引脚)
*/
#include <arduinoFFT.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
MD_MAX72XX disp = MD_MAX72XX(MD_MAX72XX::FC16_HW, 10, 1);
arduinoFFT FFT = arduinoFFT();
double realComponent[64];
double imagComponent[64];
int spectralHeight[] = {0b00000000, 0b10000000, 0b11000000,
0b11100000, 0b11110000, 0b11111000,
0b11111100, 0b11111110, 0b11111111
};
int index, c, value;
void setup()
{
disp.begin();
Serial.begin(9600);
}
void loop()
{
int sensitivity = map(analogRead(A0), 0, 1023, 50, 100);
Serial.println (analogRead(A0));
for (int i = 0; i < 64; i++)
{
realComponent[i] = analogRead(A7) / sensitivity;
imagComponent[i] = 0;
}
FFT.Windowing(realComponent, 64, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
FFT.Compute(realComponent, imagComponent, 64, FFT_FORWARD);
FFT.ComplexToMagnitude(realComponent, imagComponent, 64);
for (int i = 0; i < 32; i++)
{
realComponent[i] = constrain(realComponent[i], 0, 80);
realComponent[i] = map(realComponent[i], 0, 80, 0, 8);
index = realComponent[i];
value = spectralHeight[index];
c = 31 - i;
disp.setColumn(c, value);
}
}
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