Hi everyone, i'm new with arduino and Audio Visualizer. I'd like to create a LED show with the song Highway to hell. I'd like to create 2 different effect using FFT (Or any other similar libraries). In a first moment i've tried with MSGEQ7, but every chip was faulty, so now I must virtualize everything.
The effects are:
- Create a "rainbow VU Meter effect", which doesn't really work with the volume, but only when some instruments are playing.
- Power on all the LED When a Range of Frequency reach a minimum value. It's hard to explain, so I'm going to explain with Highway to hell. In the first seconds, we can hear only the guitar, which surely has a Specific Frequency(so the led turns on in time with the instrument). When another instrument comes, I'd like that the light continues following only the guitar.
I understand that this won't be really accurate, but I'm wondering if this is possible.
When I look for the VU METER effect with FFT, everyone uses a matrix of led, but I only want to power on one string.
For better understanding, this is MSGEQ7 datasheet
In the end, I want to emulate the MSGEQ7 to make a light effect. The audio comes from DFMini Player pins DAC_R/L
For the moment, I'm using this code which works correctly, but as I said, is a matrix and I'm not understanding how to manipulate It to make it works with 1 single led String. Moreover, i don't know how to choose only one instrument from this code.
Source of the code
#include <arduinoFFT.h>
#include <FastLED.h>
#define SAMPLES 64 // Must be a power of 2
#define MIC_IN A0 // Use A0 for mic input
#define LED_PIN 2 // Data pin to LEDS
#define NUM_LEDS 49
#define BRIGHTNESS 150 // LED information
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
#define BUTTON_PIN 3
#define xres 7 // Total number of columns in the display
#define yres 7 // Total number of rows in the display
double vReal[SAMPLES];
double vImag[SAMPLES];
int Intensity[xres] = { }; // initialize Frequency Intensity to zero
int Displacement = 1;
CRGB leds[NUM_LEDS]; // Create LED Object
arduinoFFT FFT = arduinoFFT(); // Create FFT object
void setup() {
pinMode(MIC_IN, INPUT);
Serial.begin(115200);
//Serial.begin(9600); //Initialize Serial
delay(3000); // power-up safety delay
FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip ); //Initialize LED strips
FastLED.setBrightness(BRIGHTNESS);
}
void loop() {
Visualizer();
}
void Visualizer(){
//Collect Samples
getSamples();
//Update Display
displayUpdate();
FastLED.show();
}
void getSamples(){
for(int i = 0; i < SAMPLES; i++){
vReal[i] = analogRead(MIC_IN);
Serial.println(vReal[i]);
vImag[i] = 0;
}
//FFT
FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
//Update Intensity Array
for(int i = 2; i < (xres*Displacement)+2; i+=Displacement){
vReal[i] = constrain(vReal[i],0 ,2047); // set max value for input data
vReal[i] = map(vReal[i], 0, 2047, 0, yres); // map data to fit our display
Intensity[(i/Displacement)-2] --; // Decrease displayed value
if (vReal[i] > Intensity[(i/Displacement)-2]) // Match displayed value to measured value
Intensity[(i/Displacement)-2] = vReal[i];
}
}
void displayUpdate(){
int color = 0;
for(int i = 0; i < xres; i++){
for(int j = 0; j < yres; j++){
if(j <= Intensity[i]){ // Light everything within the intensity range
if(j%2 == 0){
leds[(xres*(j+1))-i-1] = CHSV(color, 255, BRIGHTNESS);
}
else{
leds[(xres*j)+i] = CHSV(color, 255, BRIGHTNESS);
}
}
else{ // Everything outside the range goes dark
if(j%2 == 0){
leds[(xres*(j+1))-i-1] = CHSV(color, 255, 0);
}
else{
leds[(xres*j)+i] = CHSV(color, 255, 0);
}
}
}
color += 255/xres; // Increment the Hue to get the Rainbow
}
}
It's not that simple... Most instruments, and the human voice, cover most of the frequency range. Even when playing one note, there are harmonics & overtones and that's what makes a guitar sound different from a piano and it's why every singer sounds different.