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发表于 2021-12-15 15:21:45
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【花雕动手做】有趣好玩的音乐可视化系列小项目（10）---WS2812硬板屏
项目之三：六十四位闪动音乐频谱灯（8x8WS2812硬屏）
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（10）---WS2812硬板屏
- 项目之三：六十四位闪动音乐频谱灯（8x8WS2812硬屏）
- */
- #include "FastLED.h"
- #define OCTAVE 1 // // Group buckets into octaves (use the log output function LOG_OUT 1)
- #define OCT_NORM 0 // Don't normalise octave intensities by number of bins
- #define FHT_N 256 // set to 256 point fht
- #include <FHT.h> // include the library
- //int noise[] = {204,188,68,73,150,98,88,68}; // noise level determined by playing pink noise and seeing levels [trial and error]{204,188,68,73,150,98,88,68}
- // int noise[] = {204,190,108,85,65,65,55,60}; // noise for mega adk
- int noise[] = {204, 195, 100, 90, 85, 80, 75, 75}; // noise for NANO
- //int noise[] = {204,198,100,85,85,80,80,80};
- float noise_fact[] = {15, 7, 1.5, 1, 1.2, 1.4, 1.7, 3}; // noise level determined by playing pink noise and seeing levels [trial and error]{204,188,68,73,150,98,88,68}
- float noise_fact_adj[] = {15, 7, 1.5, 1, 1.2, 1.4, 1.7, 3}; // noise level determined by playing pink noise and seeing levels [trial and error]{204,188,68,73,150,98,88,68}
- #define LED_PIN 6
- #define LED_TYPE WS2812
- #define COLOR_ORDER GRB
- // Params for width and height
- const uint8_t kMatrixWidth = 8;
- const uint8_t kMatrixHeight = 8;//----------was 27
- //#define NUM_LEDS (kMatrixWidth * kMatrixHeight)
- #define NUM_LEDS 64
- CRGB leds[NUM_LEDS];
- int counter2 = 0;
- void setup() {
- Serial.begin(9600);
- delay(1000);
- FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
- FastLED.setBrightness (22);
- fill_solid(leds, NUM_LEDS, CRGB::Black);
- FastLED.show();
- // TIMSK0 = 0; // turn off timer0 for lower jitter
- ADCSRA = 0xe5; // set the adc to free running mode
- ADMUX = 0x40; // use adc0
- DIDR0 = 0x01; // turn off the digital input for adc0
- }
- void loop() {
- int prev_j[8];
- int beat = 0;
- int prev_oct_j;
- int counter = 0;
- int prev_beat = 0;
- int led_index = 0;
- int saturation = 0;
- int saturation_prev = 0;
- int brightness = 0;
- int brightness_prev = 0;
- while (1) { // reduces jitter
- cli(); // UDRE interrupt slows this way down on arduino1.0
- for (int i = 0 ; i < FHT_N ; i++) { // save 256 samples
- while (!(ADCSRA & 0x10)); // wait for adc to be ready
- ADCSRA = 0xf5; // restart adc
- byte m = ADCL; // fetch adc data
- byte j = ADCH;
- int k = (j << 8) | m; // form into an int
- k -= 0x0200; // form into a signed int
- k <<= 6; // form into a 16b signed int
- fht_input[i] = k; // put real data into bins
- }
- fht_window(); // window the data for better frequency response
- fht_reorder(); // reorder the data before doing the fht
- fht_run(); // process the data in the fht
- fht_mag_octave(); // take the output of the fht fht_mag_log()
- // every 50th loop, adjust the volume accourding to the value on A2 (Pot)
- if (counter >= 50) {
- ADMUX = 0x40 | (1 & 0x07); // set admux to look at Analogpin A1 - Master Volume
- while (!(ADCSRA & 0x10)); // wait for adc to be ready
- ADCSRA = 0xf5; // restart adc
- delay(10);
- while (!(ADCSRA & 0x10)); // wait for adc to be ready
- ADCSRA = 0xf5; // restart adc
- byte m = ADCL; // fetch adc data
- byte j = ADCH;
- int k = (j << 8) | m; // form into an int
- float master_volume = (k + 0.1) / 1000 + .75; // so the valu will be between ~0.5 and 1.---------------------+.75 was .5
- Serial.println (master_volume);
- for (int i = 1; i < 8; i++) {
- noise_fact_adj[i] = noise_fact[i] * master_volume;
- }
- ADMUX = 0x40 | (0 & 0x07); // set admux back to look at A0 analog pin (to read the microphone input
- counter = 0;
- }
- sei();
- counter++;
- // End of Fourier Transform code - output is stored in fht_oct_out[i].
- // i=0-7 frequency (octave) bins (don't use 0 or 1), fht_oct_out[1]= amplitude of frequency for bin 1
- // for loop a) removes background noise average and takes absolute value b) low / high pass filter as still very noisy
- // c) maps amplitude of octave to a colour between blue and red d) sets pixel colour to amplitude of each frequency (octave)
- for (int i = 1; i < 8; i++) { // goes through each octave. skip the first 1, which is not useful
- int j;
- j = (fht_oct_out[i] - noise[i]); // take the pink noise average level out, take the asbolute value to avoid negative numbers
- if (j < 10) {
- j = 0;
- }
- j = j * noise_fact_adj[i];
- if (j < 10) {
- j = 0;
- }
- else {
- j = j * noise_fact_adj[i];
- if (j > 180) {
- if (i >= 7) {
- beat += 2;
- }
- else {
- beat += 1;
- }
- }
- j = j / 30;
- j = j * 30; // (force it to more discrete values)
- }
- prev_j[i] = j;
- // Serial.print(j);
- // Serial.print(" ");
- // this fills in 11 LED's with interpolated values between each of the 8 OCT values
- if (i >= 2) {
- led_index = 2 * i - 3;
- prev_oct_j = (j + prev_j[i - 1]) / 2;
- saturation = constrain(j + 50, 0, 255); //-----------50 was 30
- saturation_prev = constrain(prev_oct_j + 50, 0, 255);
- brightness = constrain(j, 0, 255);
- brightness_prev = constrain(prev_oct_j, 0, 255);
- if (brightness == 255) {
- saturation = 50;
- brightness = 200;
- }
- if (brightness_prev == 255) {
- saturation_prev = 50;
- brightness_prev = 200;
- }
- for (uint8_t y = 0; y < kMatrixHeight; y++) {
- leds[XY(led_index - 1, y)] = CHSV(j + y * 30, saturation, brightness);
- if (i > 2) {
- prev_oct_j = (j + prev_j[i - 1]) / 2;
- leds[ XY(led_index - 2, y)] = CHSV(prev_oct_j + y * 30, saturation_prev, brightness_prev);
- }
- }
- }
- }
- if (beat >= 7) {
- fill_solid(leds, NUM_LEDS, CRGB::Gray);
- FastLED.setBrightness(200);
- }
- else {
- if (prev_beat != beat) {
- FastLED.setBrightness(40 + beat * beat * 5);
- prev_beat = beat;
- }
- }
- FastLED.show();
- if (beat) {
- counter2 += ((beat + 4) / 2 - 2);
- if (counter2 < 0) {
- counter2 = 1000;
- }
- if (beat > 3 && beat < 7) {
- FastLED.delay (20);
- }
- beat = 0;
- }
- // Serial.println();
- }
- }
- // Param for different pixel layouts
- const bool kMatrixSerpentineLayout = false;
- // Set 'kMatrixSerpentineLayout' to false if your pixels are
- // laid out all running the same way, like this:
- // Set 'kMatrixSerpentineLayout' to true if your pixels are
- // laid out back-and-forth, like this:
- uint16_t XY( uint8_t x, uint8_t y)
- {
- uint16_t i;
- if ( kMatrixSerpentineLayout == false) {
- i = (y * kMatrixWidth) + x;
- }
- if ( kMatrixSerpentineLayout == true) {
- if ( y & 0x01) {
- // Odd rows run backwards
- uint8_t reverseX = (kMatrixWidth - 1) - x;
- i = (y * kMatrixWidth) + reverseX;
- } else {
- // Even rows run forwards
- i = (y * kMatrixWidth) + x;
- }
- }
- i = (i + counter2) % NUM_LEDS;
- return i;
- }
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发表于 2021-12-12 18:17:35
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谢谢鼓励哦
