【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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