本帖最后由 驴友花雕 于 2021-10-9 07:10 编辑
【花雕动手做】有趣好玩的音乐可视化系列小项目（05）---WS2812柱跳灯
项目之一：使用MAX9814的音乐反应简单柱跳灯
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（05）---WS2812柱跳灯
- 项目之一：使用MAX9814的音乐反应简单柱跳灯
- */
-
- #include <Adafruit_NeoPixel.h>
- #include <math.h>
- #define N_PIXELS 8
- #define MIC_PIN A0
- #define LED_PIN 6
- #define SAMPLE_WINDOW 5
- #define PEAK_HANG 24
- #define PEAK_FALL 4
- #define INPUT_FLOOR 10
- #define INPUT_CEILING 50
- byte peak = 16;
- unsigned int sample;
-
- byte Count = 0;
- byte HangCount = 0;
-
- Adafruit_NeoPixel strip = Adafruit_NeoPixel(N_PIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);
-
- void setup() {
- Serial.begin(9600);
- analogReference(EXTERNAL);
- strip.setBrightness(22);
- strip.show();
- strip.begin();
- }
-
- float fscale( float originalMin, float originalMax, float newBegin, float newEnd, float inputValue, float curve) {
-
- float OriginalRange = 0;
- float NewRange = 0;
- float zeroRefCurVal = 0;
- float normalizedCurVal = 0;
- float rangedValue = 0;
- boolean invFlag = 0;
-
- if (curve > 10) curve = 10;
- if (curve < -10) curve = -10;
-
- curve = (curve * -.1) ;
- curve = pow(10, curve);
-
- if (inputValue < originalMin) {
- inputValue = originalMin;
- }
- if (inputValue > originalMax) {
- inputValue = originalMax;
- }
-
- OriginalRange = originalMax - originalMin;
-
- if (newEnd > newBegin) {
- NewRange = newEnd - newBegin;
- }
- else
- {
- NewRange = newBegin - newEnd;
- invFlag = 1;
- }
-
- zeroRefCurVal = inputValue - originalMin;
- normalizedCurVal = zeroRefCurVal / OriginalRange; // normalize to 0 - 1 float
-
- Serial.print(OriginalRange, DEC);
- Serial.print(" ");
- Serial.print(NewRange, DEC);
- Serial.print(" ");
- Serial.println(zeroRefCurVal, DEC);
- Serial.println();
- delay(10);
-
- if (originalMin > originalMax ) {
- return 0;
- }
-
- if (invFlag == 0) {
- rangedValue = (pow(normalizedCurVal, curve) * NewRange) + newBegin;
- }
- else
- {
- rangedValue = newBegin - (pow(normalizedCurVal, curve) * NewRange);
- }
- return rangedValue;
- }
-
- void loop() {
- unsigned long startMillis = millis();
- float peakToPeak = 0;
-
- unsigned int signalMax = 0;
- unsigned int signalMin = 1023;
- unsigned int c, y;
-
- while (millis() - startMillis < SAMPLE_WINDOW)
- {
- sample = analogRead(MIC_PIN);
- if (sample < 1024)
- {
- if (sample > signalMax)
- {
- signalMax = sample;
- }
- else if (sample < signalMin)
- {
- signalMin = sample;
- }
- }
- }
- peakToPeak = signalMax - signalMin;
-
- for (int i = 0; i <= strip.numPixels() - 1; i++) {
- strip.setPixelColor(i, Wheel(map(i, 0, strip.numPixels() - 1, 30, 150)));
- }
-
- c = fscale(INPUT_FLOOR, INPUT_CEILING, strip.numPixels(), 0, peakToPeak, 2);
-
- if (c < peak) {
- peak = c;
- HangCount = 0;
- }
- if (c <= strip.numPixels()) {
- drawLine(strip.numPixels(), strip.numPixels() - c, strip.Color(0, 0, 0));
- }
-
- y = strip.numPixels() - peak;
- strip.setPixelColor(y - 1, Wheel(map(y, 0, strip.numPixels() - 1, 30, 150)));
- strip.show();
-
- if (HangCount > PEAK_HANG) {
- if (++Count >= PEAK_FALL) {
- peak++;
- Count = 0;
- }
- }
- else {
- HangCount++;
- }
- }
-
- void drawLine(uint8_t from, uint8_t to, uint32_t c) {
- uint8_t fromTemp;
- if (from > to) {
- fromTemp = from;
- from = to;
- to = fromTemp;
- }
- for (int i = from; i <= to; i++) {
- strip.setPixelColor(i, c);
- }
- }
-
- uint32_t Wheel(byte WheelPos) {
- if (WheelPos < 85) {
- return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
- }
- else if (WheelPos < 170) {
- WheelPos -= 85;
- return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
- }
- else {
- WheelPos -= 170;
- return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
- }
- }
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