【花雕动手做】有趣好玩的音乐可视化项目（11）---WS2812幻彩LED灯带
实验程序四：MegunoLink音乐反应式24颗LED灯带
- /*
- 【花雕动手做】有趣好玩的音乐可视化项目（11）---WS2812幻彩LED灯带
- 实验程序四：MegunoLink音乐反应式24颗LED灯带
- */
-
- #include<FastLED.h>
- #include<MegunoLink.h>
- #include<Filter.h>
-
- // define necessary parameters
- #define N_PIXELS 24
- #define MIC_PIN A0
- #define LED_PIN D6 // labeled "D6" on the board
- // the following parameters can be tweaked according to your audio levels
- #define NOISE 50
- #define TOP (N_PIXELS+2) // allow the max level to be slightly off scale
- #define LED_TYPE WS2811
- #define BRIGHTNESS 18 // a little dim for recording purposes
- #define COLOR_ORDER GRB
-
- // declare the LED array
- CRGB leds[N_PIXELS];
-
- // define the variables needed for the audio levels
- int lvl = 0, minLvl = 0, maxLvl = 600; // tweak the min and max as needed
-
- // instantiate the filter class for smoothing the raw audio signal
- ExponentialFilter<long> ADCFilter(5,0);
-
- void setup() {
- // put your setup code here, to run once:
- Serial.begin(115200);
- // initialize the LED object
- FastLED.addLeds<LED_TYPE,LED_PIN,COLOR_ORDER>(leds,N_PIXELS).setCorrection(TypicalLEDStrip);
- FastLED.setBrightness(BRIGHTNESS);
- }
-
- void loop() {
- // put your main code here, to run repeatedly:
- // read the audio signal and filter it
- int n, height;
- n = analogRead(MIC_PIN);
- // remove the MX9614 bias of 1.25VDC
- n = abs(1023 - n);
- // hard limit noise/hum
- n = (n <= NOISE) ? 0 : abs(n - NOISE);
- // apply the exponential filter to smooth the raw signal
- ADCFilter.Filter(n);
- lvl = ADCFilter.Current();
- // // plot the raw versus filtered signals
- // Serial.print(n);
- // Serial.print(" ");
- // Serial.println(lvl);
- // calculate the number of pixels as a percentage of the range
- // TO-DO: can be done dynamically by using a running average of min/max audio levels
- height = TOP * (lvl - minLvl) / (long)(maxLvl - minLvl);
- if(height < 0L) height = 0;
- else if(height > TOP) height = TOP;
- // turn the LEDs corresponding to the level on/off
- for(uint8_t i = 0; i < N_PIXELS; i++) {
- // turn off LEDs above the current level
- if(i >= height) leds[i] = CRGB(0,0,0);
- // otherwise, turn them on!
- else leds[i] = Wheel( map( i, 0, N_PIXELS-1, 30, 150 ) );
- }
- FastLED.show();
- }
-
- CRGB Wheel(byte WheelPos) {
- // return a color value based on an input value between 0 and 255
- if(WheelPos < 85)
- return CRGB(WheelPos * 3, 255 - WheelPos * 3, 0);
- else if(WheelPos < 170) {
- WheelPos -= 85;
- return CRGB(255 - WheelPos * 3, 0, WheelPos * 3);
- } else {
- WheelPos -= 170;
- return CRGB(0, WheelPos * 3, 255 - WheelPos * 3);
- }
- }
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