【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
项目之二:多档arduinoFFT浮点32段频谱仪
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
项目之二:多档arduinoFFT浮点32段频谱仪
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>
#define SAMPLES 64
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 4
#define CLK_PIN 13
#define DATA_PIN 11
#define CS_PIN 10
#define xres 32
#define yres 8
int MY_ARRAY[] = {0, 128, 192, 224, 240, 248, 252, 254, 255};
int MY_MODE_1[] = {0, 128, 192, 224, 240, 248, 252, 254, 255};
int MY_MODE_2[] = {0, 128, 64, 32, 16, 8, 4, 2, 1};
int MY_MODE_3[] = {0, 128, 192, 160, 144, 136, 132, 130, 129};
int MY_MODE_4[] = {0, 128, 192, 160, 208, 232, 244, 250, 253};
int MY_MODE_5[] = {0, 1, 3, 7, 15, 31, 63, 127, 255};
double vReal[SAMPLES];
double vImag[SAMPLES];
char data_avgs[xres];
int yvalue;
int displaycolumn , displayvalue;
int peaks[xres];
const int buttonPin = 2;
int state = HIGH;
int previousState = LOW;
int displaymode = 1;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
arduinoFFT FFT = arduinoFFT();
void setup() {
ADCSRA = 0b11100101;
ADMUX = 0b00000000;
pinMode(buttonPin, INPUT);
mx.begin();
delay(50);
}
void loop() {
// ++ Sampling
for (int i = 0; i < SAMPLES; i++)
{
while (!(ADCSRA & 0x10));
ADCSRA = 0b11110101 ;
int value = ADC - 512 ;
vReal[i] = value / 8;
vImag[i] = 0;
}
FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
int step = (SAMPLES / 2) / xres;
int c = 0;
for (int i = 0; i < (SAMPLES / 2); i += step)
{
data_avgs[c] = 0;
for (int k = 0 ; k < step ; k++) {
data_avgs[c] = data_avgs[c] + vReal[i + k];
}
data_avgs[c] = data_avgs[c] / step;
c++;
}
for (int i = 0; i < xres; i++)
{
data_avgs[i] = constrain(data_avgs[i], 0, 80);
data_avgs[i] = map(data_avgs[i], 0, 80, 0, yres);
yvalue = data_avgs[i];
peaks[i] = peaks[i] - 1;
if (yvalue > peaks[i])
peaks[i] = yvalue ;
yvalue = peaks[i];
displayvalue = MY_ARRAY[yvalue];
displaycolumn = 15 - i;
mx.setColumn(displaycolumn, displayvalue);
}
displayModeChange ();
}
void displayModeChange() {
int reading = digitalRead(buttonPin);
if (reading == HIGH && previousState == LOW && millis() - lastDebounceTime > debounceDelay)
{
switch (displaymode) {
case 1:
displaymode = 2;
for (int i = 0 ; i <= 8 ; i++ ) {
MY_ARRAY[i] = MY_MODE_2[i];
}
break;
case 2:
displaymode = 3;
for (int i = 0 ; i <= 8 ; i++ ) {
MY_ARRAY[i] = MY_MODE_3[i];
}
break;
case 3:
displaymode = 4;
for (int i = 0 ; i <= 8 ; i++ ) {
MY_ARRAY[i] = MY_MODE_4[i];
}
break;
case 4:
displaymode = 5;
for (int i = 0 ; i <= 8 ; i++ ) {
MY_ARRAY[i] = MY_MODE_5[i];
}
break;
case 5:
displaymode = 1;
for (int i = 0 ; i <= 8 ; i++ ) {
MY_ARRAY[i] = MY_MODE_1[i];
}
break;
}
lastDebounceTime = millis();
}
previousState = reading;
}
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