Here it is, but I must say its not very elegant, its an amalgamation of the Micro Beat Detection from Stephan Schultz (GitHub - Steppschuh/Micro-Beat-Detection: Beat detection using microphone input on microcontrollers) with some more sound detection modes added by me. Again, sorry for the sphagetti:
#define LOG_OUT 1 // use the log output function
#define FHT_N 128 // amount of bins to use
#include <SoftwareSerial.h>
#include <FHT.h> // include the library
#include <Adafruit_NeoPixel.h>
#define FreqLog // use log scale for FHT frequencies
#define FreqGainFactorBits 0
#define FreqSerialBinary
#define VolumeGainFactorBits 0
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
#define PIN 6
#define NUMPIXELS 14
//Bluetooth
SoftwareSerial BTserial(2, 3); // RX | TX
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
//number for deciding sound detection mode
char mode = '0';
float sensitivity=0.23;
bool firstTime = true;
int sensorValue1;
int sensorValue2;
int sensorValue3;
int nSamples = 150;
int values[150];
int valuesIndex=0;
float suma = 0;
int media = 0;
float threshhold;
int maxValue;
int minValue;
float restaIntensidad = 0.2;
int rojo = 255;
int verde = 255;
int azul = 255;
int rojoActual=0;
int verdeActual=0;
int azulActual =0;
//BT
// Set to true if you want to use the FHT 128 channel analyser to visualize
// the detected frequencies. Will disable beat detection.
const bool LOG_FREQUENCY_DATA = false;
// Set to true if the light should be based on detected beats instead
// of detected amplitudes.
const bool PERFORM_BEAT_DETECTION = false;
const int SOUND_REFERENCE_PIN = 8; // D8
const int HAT_LIGHTS_PIN = 9; // D9
const int HAT_LIGHTS_LOW_PIN = 11; // D11
const int HAT_LIGHTS_HIGH_PIN = 12; // D12
const int HAT_LIGHTS_PULSE_PIN = 13; // D13
const int LIGHT_PULSE_DELAY = 10000;
const int LIGHT_PULSE_DURATION = 2000;
const int LIGHT_FADE_OUT_DURATION = 200; // good value range is [100:1000]
const float MINIMUM_LIGHT_INTENSITY = 0; // in range [0:1]
const float MAXIMUM_LIGHT_INTENSITY = 1; // in range [0:1]
const int MAXIMUM_SIGNAL_VALUE = 1024;
const int OVERALL_FREQUENCY_RANGE_START = 2; // should be 0, but first 2 bands produce too much noise
const int OVERALL_FREQUENCY_RANGE_END = FHT_N / 2;
const int OVERALL_FREQUENCY_RANGE = OVERALL_FREQUENCY_RANGE_END - OVERALL_FREQUENCY_RANGE_START;
const int FIRST_FREQUENCY_RANGE_START = 2;
const int FIRST_FREQUENCY_RANGE_END = 4;
const int FIRST_FREQUENCY_RANGE = FIRST_FREQUENCY_RANGE_END - FIRST_FREQUENCY_RANGE_START;
const int SECOND_FREQUENCY_RANGE_START = 2;
const int SECOND_FREQUENCY_RANGE_END = 6;
const int SECOND_FREQUENCY_RANGE = SECOND_FREQUENCY_RANGE_END - SECOND_FREQUENCY_RANGE_START;
const int MAXIMUM_BEATS_PER_MINUTE = 200;
const int MINIMUM_DELAY_BETWEEN_BEATS = 60000L / MAXIMUM_BEATS_PER_MINUTE;
const int SINGLE_BEAT_DURATION = 100; // good value range is [50:150]
const int FREQUENCY_MAGNITUDE_SAMPLES = 5; // good value range is [5:15]
int frequencyMagnitudeSampleIndex = 0;
int currentOverallFrequencyMagnitude = 0;
int totalOverallFrequencyMagnitude = 0;
int averageOverallFrequencyMagnitude = 0;
int overallFrequencyMagnitudeVariance = 0;
byte overallFrequencyMagnitudes[FREQUENCY_MAGNITUDE_SAMPLES];
int currentFirstFrequencyMagnitude = 0;
int totalFirstFrequencyMagnitude = 0;
int averageFirstFrequencyMagnitude = 0;
int firstFrequencyMagnitudeVariance = 0;
byte firstFrequencyMagnitudes[FREQUENCY_MAGNITUDE_SAMPLES];
int currentSecondFrequencyMagnitude = 0;
int totalSecondFrequencyMagnitude = 0;
int averageSecondFrequencyMagnitude = 0;
int secondFrequencyMagnitudeVariance = 0;
byte secondFrequencyMagnitudes[FREQUENCY_MAGNITUDE_SAMPLES];
int currentSignal = 0;
int totalSignal = 0;
int averageSignal = 0;
int signalVariance = 0;
byte signals[FREQUENCY_MAGNITUDE_SAMPLES];
long lastBeatTimestamp = 0;
long durationSinceLastBeat = 0;
float beatProbability = 0;
float beatProbabilityThreshold = 0.5;
long lightIntensityBumpTimestamp = 0;
float lightIntensityBumpValue = 0;
float lightIntensityValue = 0;
long lastPulseTimestamp = 0;
void setup() {
pixels.begin();
for(int i = 0; i < nSamples; i++){
values[i]=390;
}
Serial.begin(9600);
Serial.println("Arduino is ready");
// HC-05 default serial speed for commincation mode is 9600
BTserial.begin(9600);
}
/**
* Analog to Digital Conversion needs to be configured to free running mode
* in order to read the sound sensor values at a high frequency.
*
* See: http://maxembedded.com/2011/06/the-adc-of-the-avr/
*/
void setupADC() {
ADCSRA = 0xe0+7; // "ADC Enable", "ADC Start Conversion", "ADC Auto Trigger Enable" and divider.
ADMUX = 0x0; // use adc0. Use ARef pin for analog reference (same as analogReference(EXTERNAL)).
ADMUX |= 0x40; // Use Vcc for analog reference.
DIDR0 = 0x01; // turn off the digital input for adc0
}
void loop() {
//El modo cero estara activo hasta que se cambie, indicando que se necesita conectar la app BT
readBT();
switch(mode){
case '0':
btSearchMode();
break;
case '1':
pulsatingMode();
break;
case '2':
onMode();
break;
case '3':
offMode();
break;
case '4':
audioDetectionMode();
break;
case '5':
beatDetectionMode();
break;
default:
Serial.println("Unregistered mode");
break;
}
}
//Funcion encargada de apagar todas las luces del dispositivo
void offMode(){
pixels.setPixelColor(0, pixels.Color(0,0,0));
pixels.show();
}
//Funcion encargada de encender todas las luces del dispositivo
void onMode(){
pixels.setPixelColor(0, pixels.Color(rojo, verde, azul));
pixels.show();
}
//Funcion encargada de crear un patron pulsante. Sera en modo neutro del dispositivo
void pulsatingMode(){
float restaRojo = restaIntensidad*rojo;
float restaVerde = restaIntensidad*verde;
float restaAzul = restaIntensidad*azul;
while(rojoActual>restaRojo&&verdeActual>restaVerde&&azulActual>restaAzul){
rojoActual=rojo;
azulActual=azul;
verdeActual=verde;
if(rojoActual< restaRojo){
rojoActual=0;
}
else{
rojoActual-=restaRojo;
}
if(verdeActual<restaVerde){
verdeActual=0;
}
else{
verdeActual-=restaVerde;
}
if(azulActual<restaAzul){
azulActual=0;
}
else{
azulActual-=restaAzul;
}
pixels.setPixelColor(0, pixels.Color(rojoActual, verdeActual, azulActual));
pixels.show();
delay(20);
}
while(rojoActual<(rojo-restaRojo)&&verdeActual<(verde-restaVerde)&&azulActual<(azul-restaAzul)){
if(rojoActual<(rojo-restaRojo)){
rojoActual+=restaRojo;
}
if(verdeActual<(verde-restaVerde)){
verdeActual+=restaVerde;
}
if(azulActual<(azul-restaAzul)){
azulActual+=restaAzul;
}
pixels.setPixelColor(0, pixels.Color(rojoActual, verdeActual, azulActual));
pixels.show();
delay(20);
}
}
//Funcion encargada de crear un patron intermitente en las luces del dispositivo indicando la necesidad de conectar BT
void btSearchMode(){
pixels.setPixelColor(0, pixels.Color(40, 40, 255));
pixels.show();
delay(150);
pixels.setPixelColor(0, pixels.Color(0,0,0));
pixels.show();
delay(100);
pixels.setPixelColor(0, pixels.Color(40, 40, 255));
pixels.show();
delay(400);
pixels.setPixelColor(0, pixels.Color(0,0,0));
pixels.show();
delay(1000);
}
//Funcion encargada de leer los comandos Bluetooth y cambiar los parametros segun:
void readBT(){
String lectura;
char opcion = 'o';
// Keep reading from HC-05 and send to Arduino Serial Monitor
if(BTserial.available()>0){
lectura = BTserial.readString();
Serial.println(lectura);
opcion=lectura.charAt(0);
Serial.print("La opcion elegida es ");
Serial.println( opcion);
switch(opcion){
case 'm':
Serial.print("Entering case ");
Serial.println("m");
char nmode=lectura.charAt(1);
Serial.println("Nuevo modo: "+nmode);
mode = nmode;
break;
case 'v':
Serial.print("Entering case ");
Serial.println("v");
String nVel = lectura.substring(1,7);
restaIntensidad= nVel.toFloat();
Serial.print("Nueva velocidad: ");
Serial.println(restaIntensidad);
break;
case 's':
Serial.print("Entering case ");
Serial.println("s");
String nSens = lectura.substring(1,6);
sensitivity= nSens.toFloat();
Serial.print("Nueva sensitividad: ");
Serial.println(sensitivity);
break;
case 'c':
Serial.print("Entering case ");
Serial.println("c");
String nrojo = lectura.substring(1,4);
String nverde = lectura.substring(4,7);
String nazul = lectura.substring(7,10);
rojo = nrojo.toInt();
verde = nverde.toInt();
azul = nazul.toInt();
Serial.println("Nuevo color: "+nrojo+" "+nverde+" "+nazul);
break;
default:
Serial.print("Entering case ");
Serial.println("default");
Serial.println("Opcion desconocida: "+opcion);
break;
}
lectura = "";
BTserial.flush();
}
}
void beatDetectionMode(){
if(firstTime){
setupADC();
pinMode(LED_BUILTIN, OUTPUT);
pinMode(HAT_LIGHTS_PIN, OUTPUT);
pinMode(HAT_LIGHTS_LOW_PIN, OUTPUT);
pinMode(HAT_LIGHTS_HIGH_PIN, OUTPUT);
pinMode(HAT_LIGHTS_PULSE_PIN, OUTPUT);
pinMode(SOUND_REFERENCE_PIN, OUTPUT);
digitalWrite(HAT_LIGHTS_PIN, HIGH);
digitalWrite(SOUND_REFERENCE_PIN, HIGH);
analogWrite(HAT_LIGHTS_LOW_PIN, 255 * MINIMUM_LIGHT_INTENSITY);
analogWrite(HAT_LIGHTS_HIGH_PIN, 255 * MAXIMUM_LIGHT_INTENSITY);
for (int i = 0; i < FREQUENCY_MAGNITUDE_SAMPLES; i++) {
overallFrequencyMagnitudes[i] = 0;
firstFrequencyMagnitudes[i] = 0;
secondFrequencyMagnitudes[i] = 0;
signals[i] = 0;
}
firstTime=false;
}
if (LOG_FREQUENCY_DATA) {
readAudioSamples();
getFrequencyData();
logFrequencyData();
} else {
Serial.print(String(millis()));
readAudioSamples();
if (PERFORM_BEAT_DETECTION) {
getFrequencyData();
processFrequencyData();
updateBeatProbability();
updateLightIntensityBasedOnBeats();
} else {
updateLightIntensityBasedOnAmplitudes();
}
updateLights();
Serial.println("");
}
}
void audioDetectionMode(){
sensorValue1 = analogRead(A0);
sensorValue2 = analogRead(A1);
sensorValue3 = analogRead(A2);
values[valuesIndex]=(sensorValue1+sensorValue2+sensorValue3)/3;
for(int i = 0; i < nSamples; i++){
suma+=values[i];
//Estos ifs se encargan de encontrar el maximo y el minimo para poder calcular el limite de activación
if(values[i]>maxValue){
maxValue=values[i];
}
if(values[i]<minValue){
minValue=values[i];
}
}
media = suma/nSamples;
//Esta linea calcula el limite de activación
threshhold = (maxValue-minValue)*sensitivity;
if(values[valuesIndex]>media+threshhold||values[valuesIndex]<media-threshhold){
rojoActual= rojo;
verdeActual= verde;
azulActual=azul;
}
else{
float restaRojo = restaIntensidad*rojo;
float restaVerde = restaIntensidad*verde;
float restaAzul = restaIntensidad*azul;
if(rojoActual< restaRojo){
rojoActual=0;
}
else{
rojoActual-=restaRojo;
}
if(verdeActual<restaVerde){
verdeActual=0;
}
else{
verdeActual-=restaVerde;
}
if(azulActual<restaAzul){
azulActual=0;
}
else{
azulActual-=restaAzul;
}
}
pixels.setPixelColor(0, pixels.Color(rojoActual, verdeActual, azulActual));
pixels.show();
valuesIndex=(valuesIndex+1)%(nSamples);
maxValue = 0;
minValue = 1000;
suma=0;
}
/**
* Will read the sound sensor values from pin A0.
*/
void readAudioSamples() {
long currentAverage = 0;
long currentMaximum = 0;
long currentMinimum = MAXIMUM_SIGNAL_VALUE;
for (int i = 0; i < FHT_N; i++) { // save 256 samples
while (!(ADCSRA & /*0x10*/_BV(ADIF))); // wait for adc to be ready (ADIF)
sbi(ADCSRA, ADIF); // restart adc
byte m = ADCL; // fetch adc data
byte j = ADCH;
int k = ((int) j << 8) | m; // form into an int
currentMinimum = min(currentMinimum, k);
currentMaximum = max(currentMaximum, k);
currentAverage += k;
k -= 0x0200; // form into a signed int
k <<= 6; // form into a 16b signed int
k <<= FreqGainFactorBits;
fht_input[i] = k; // put real data into bins
}
currentAverage /= FHT_N;
int signalDelta = currentMaximum - currentAverage;
currentSignal = currentAverage + (2 * signalDelta);
constrain(currentSignal, 0, currentMaximum);
processHistoryValues(
signals,
frequencyMagnitudeSampleIndex,
currentSignal,
totalSignal,
averageSignal,
signalVariance
);
//logValue("A", (float) currentAverage / MAXIMUM_SIGNAL_VALUE, 10);
//logValue("M", (float) currentMaximum / MAXIMUM_SIGNAL_VALUE, 10);
logValue("S", (float) currentSignal / MAXIMUM_SIGNAL_VALUE, 20);
}
/**
* Will run the Fast Hartley Transform to convert the time domain signals
* to the frequency domain.
*
* See: http://wiki.openmusiclabs.com/wiki/ArduinoFHT
*/
void getFrequencyData() {
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_log(); // get the magnitude of each bin in the FHT
}
void logFrequencyData() {
#ifdef FreqSerialBinary
// print as binary
Serial.write(255); // send a start byte
Serial.write(fht_log_out, FHT_N / 2); // send out the data
#else
// print as text
for (int i = 0; i < FHT_N / 2; i++) {
Serial.print(fht_log_out[i]);
Serial.print(',');
}
#endif
}
/**
* Will extract insightful features from the frequency data in order
* to perform the beat detection.
*/
void processFrequencyData() {
// each of the methods below will:
// - get the current frequency magnitude
// - add the current magnitude to the history
// - update relevant features
processOverallFrequencyMagnitude();
processFirstFrequencyMagnitude();
processSecondFrequencyMagnitude();
// prepare the magnitude sample index for the next update
frequencyMagnitudeSampleIndex += 1;
if (frequencyMagnitudeSampleIndex >= FREQUENCY_MAGNITUDE_SAMPLES) {
frequencyMagnitudeSampleIndex = 0; // wrap the index
}
}
void processOverallFrequencyMagnitude() {
currentOverallFrequencyMagnitude = getFrequencyMagnitude(
fht_log_out,
OVERALL_FREQUENCY_RANGE_START,
OVERALL_FREQUENCY_RANGE_END
);
processHistoryValues(
overallFrequencyMagnitudes,
frequencyMagnitudeSampleIndex,
currentOverallFrequencyMagnitude,
totalOverallFrequencyMagnitude,
averageOverallFrequencyMagnitude,
overallFrequencyMagnitudeVariance
);
}
void processFirstFrequencyMagnitude() {
currentFirstFrequencyMagnitude = getFrequencyMagnitude(
fht_log_out,
FIRST_FREQUENCY_RANGE_START,
FIRST_FREQUENCY_RANGE_END
);
processHistoryValues(
firstFrequencyMagnitudes,
frequencyMagnitudeSampleIndex,
currentFirstFrequencyMagnitude,
totalFirstFrequencyMagnitude,
averageFirstFrequencyMagnitude,
firstFrequencyMagnitudeVariance
);
}
void processSecondFrequencyMagnitude() {
currentSecondFrequencyMagnitude = getFrequencyMagnitude(
fht_log_out,
SECOND_FREQUENCY_RANGE_START,
SECOND_FREQUENCY_RANGE_END
);
processHistoryValues(
secondFrequencyMagnitudes,
frequencyMagnitudeSampleIndex,
currentSecondFrequencyMagnitude,
totalSecondFrequencyMagnitude,
averageSecondFrequencyMagnitude,
secondFrequencyMagnitudeVariance
);
}
byte getFrequencyMagnitude(byte frequencies[], const int startIndex, const int endIndex) {
int total = 0;
int average = 0;
int maximum = 0;
int minimum = MAXIMUM_SIGNAL_VALUE;
int current;
for (int i = startIndex; i < endIndex; i++) {
current = frequencies[i];
total += current;
maximum = max(maximum, current);
minimum = min(minimum, current);
}
average = total / (endIndex - startIndex);
int value = average;
//int value = maximum - average;
//logValue("F", (float) value / 128, 10);
return value;
}
void processHistoryValues(byte history[], int &historyIndex, int ¤t, int &total, int &average, int &variance) {
total -= history[historyIndex]; // subtract the oldest history value from the total
total += (byte) current; // add the current value to the total
history[historyIndex] = current; // add the current value to the history
average = total / FREQUENCY_MAGNITUDE_SAMPLES;
// update the variance of frequency magnitudes
long squaredDifferenceSum = 0;
for (int i = 0; i < FREQUENCY_MAGNITUDE_SAMPLES; i++) {
squaredDifferenceSum += pow(history[i] - average, 2);
}
variance = (double) squaredDifferenceSum / FREQUENCY_MAGNITUDE_SAMPLES;
}
/**
* Will update the beat probability, a value between 0 and 1
* indicating how likely it is that there's a beat right now.
*/
void updateBeatProbability() {
beatProbability = 1;
beatProbability *= calculateSignalChangeFactor();
beatProbability *= calculateMagnitudeChangeFactor();
beatProbability *= calculateVarianceFactor();
beatProbability *= calculateRecencyFactor();
if (beatProbability >= beatProbabilityThreshold) {
lastBeatTimestamp = millis();
durationSinceLastBeat = 0;
}
logValue("B", beatProbability, 5);
}
/**
* Will calculate a value in range [0:2] based on the magnitude changes of
* different frequency bands.
* Low values are indicating a low beat probability.
*/
float calculateSignalChangeFactor() {
float aboveAverageSignalFactor;
if (averageSignal < 75 || currentSignal < 150) {
aboveAverageSignalFactor = 0;
} else {
aboveAverageSignalFactor = ((float) currentSignal / averageSignal);
aboveAverageSignalFactor = constrain(aboveAverageSignalFactor, 0, 2);
}
//logValue("SC", (float) currentSignal / 512, 10);
//logValue("SA", (float) averageSignal / 512, 10);
logValue("SF", aboveAverageSignalFactor / 2, 2);
return aboveAverageSignalFactor;
}
/**
* Will calculate a value in range [0:1] based on the magnitude changes of
* different frequency bands.
* Low values are indicating a low beat probability.
*/
float calculateMagnitudeChangeFactor() {
float changeThresholdFactor = 1.1;
if (durationSinceLastBeat < 750) {
// attempt to not miss consecutive beats
changeThresholdFactor *= 0.95;
} else if (durationSinceLastBeat > 1000) {
// reduce false-positives
changeThresholdFactor *= 1.05;
}
// current overall magnitude is higher than the average, probably
// because the signal is mainly noise
float aboveAverageOverallMagnitudeFactor = ((float) currentOverallFrequencyMagnitude / averageOverallFrequencyMagnitude);
aboveAverageOverallMagnitudeFactor -= 1.05;
aboveAverageOverallMagnitudeFactor *= 10;
aboveAverageOverallMagnitudeFactor = constrain(aboveAverageOverallMagnitudeFactor, 0, 1);
// current magnitude is higher than the average, probably
// because the there's a beat right now
float aboveAverageFirstMagnitudeFactor = ((float) currentFirstFrequencyMagnitude / averageFirstFrequencyMagnitude);
aboveAverageOverallMagnitudeFactor -= 0.1;
aboveAverageFirstMagnitudeFactor *= 1.5;
aboveAverageFirstMagnitudeFactor = pow(aboveAverageFirstMagnitudeFactor, 3);
aboveAverageFirstMagnitudeFactor /= 3;
aboveAverageFirstMagnitudeFactor -= 1.25;
aboveAverageFirstMagnitudeFactor = constrain(aboveAverageFirstMagnitudeFactor, 0, 1);
float aboveAverageSecondMagnitudeFactor = ((float) currentSecondFrequencyMagnitude / averageSecondFrequencyMagnitude);
aboveAverageSecondMagnitudeFactor -= 1.01;
aboveAverageSecondMagnitudeFactor *= 10;
aboveAverageSecondMagnitudeFactor = constrain(aboveAverageSecondMagnitudeFactor, 0, 1);
float magnitudeChangeFactor = aboveAverageFirstMagnitudeFactor;
if (magnitudeChangeFactor > 0.15) {
magnitudeChangeFactor = max(aboveAverageFirstMagnitudeFactor, aboveAverageSecondMagnitudeFactor);
}
if (magnitudeChangeFactor < 0.5 && aboveAverageOverallMagnitudeFactor > 0.5) {
// there's no bass related beat, but the overall magnitude changed significantly
magnitudeChangeFactor = max(magnitudeChangeFactor, aboveAverageOverallMagnitudeFactor);
} else {
// this is here to avoid treating signal noise as beats
//magnitudeChangeFactor *= 1 - aboveAverageOverallMagnitudeFactor;
}
//float maximumMagnitude = 128; //128;
//logValue("CO", (currentOverallFrequencyMagnitude - averageOverallFrequencyMagnitude) / maximumMagnitude, 5);
//logValue("C1", (currentFirstFrequencyMagnitude - averageFirstFrequencyMagnitude) / maximumMagnitude, 5);
//logValue("C2", (currentSecondFrequencyMagnitude - averageSecondFrequencyMagnitude) / maximumMagnitude, 5);
//logValue("CO", (currentOverallFrequencyMagnitude) / maximumMagnitude, 10);
//logValue("C1", (currentFirstFrequencyMagnitude) / maximumMagnitude, 10);
//logValue("C2", (currentSecondFrequencyMagnitude) / maximumMagnitude, 10);
logValue("AO", aboveAverageOverallMagnitudeFactor, 2);
logValue("A1", aboveAverageFirstMagnitudeFactor, 10);
logValue("A2", aboveAverageSecondMagnitudeFactor, 10);
//logValue("A1|2", max(aboveAverageFirstMagnitudeFactor, aboveAverageSecondMagnitudeFactor), 1);
logValue("M", magnitudeChangeFactor, 1);
return magnitudeChangeFactor;
}
/**
* Will calculate a value in range [0:1] based on variance in the first and second
* frequency band over time. The variance will be high if the magnitude of bass
* frequencies changed in the last few milliseconds.
* Low values are indicating a low beat probability.
*/
float calculateVarianceFactor() {
// a beat also requires a high variance in recent frequency magnitudes
float firstVarianceFactor = ((float) (firstFrequencyMagnitudeVariance - 50) / 20) - 1;
firstVarianceFactor = constrain(firstVarianceFactor, 0, 1);
float secondVarianceFactor = ((float) (secondFrequencyMagnitudeVariance - 50) / 20) - 1;
secondVarianceFactor = constrain(secondVarianceFactor, 0, 1);
float varianceFactor = max(firstVarianceFactor, secondVarianceFactor);
logValue("V", varianceFactor, 1);
return varianceFactor;
}
/**
* Will calculate a value in range [0:1] based on the recency of the last detected beat.
* Low values are indicating a low beat probability.
*/
float calculateRecencyFactor() {
float recencyFactor = 1;
durationSinceLastBeat = millis() - lastBeatTimestamp;
int referenceDuration = MINIMUM_DELAY_BETWEEN_BEATS - SINGLE_BEAT_DURATION;
recencyFactor = 1 - ((float) referenceDuration / durationSinceLastBeat);
recencyFactor = constrain(recencyFactor, 0, 1);
//logValue("R", recencyFactor, 5);
return recencyFactor;
}
/**
* Will update the light intensity bump based on the recency of detected beats.
*/
void updateLightIntensityBasedOnBeats() {
float intensity = 1 - ((float) durationSinceLastBeat / LIGHT_FADE_OUT_DURATION);
intensity = constrain(intensity, 0, 1);
if (intensity > lightIntensityValue) {
lightIntensityBumpValue = intensity;
lightIntensityBumpTimestamp = millis();
}
}
/**
* Will update the light intensity bump based on measured amplitudes.
*/
void updateLightIntensityBasedOnAmplitudes() {
float intensity;
if (averageSignal < 1 || currentSignal < 1) {
intensity = 0;
} else {
intensity = (float) (currentSignal - averageSignal) / MAXIMUM_SIGNAL_VALUE;
intensity *= pow(intensity, 3);
if (intensity < 0.1) {
intensity = 0;
} else {
intensity -= 0.1;
intensity = pow(1 + intensity, 3) - 1;
intensity = constrain(intensity, 0, 1);
}
}
logValue("I", intensity, 10);
if (intensity > lightIntensityValue) {
lightIntensityBumpValue = intensity;
lightIntensityBumpTimestamp = millis();
}
}
/**
* Will update the hat lights based on the last light intensity bumps.
*/
void updateLights() {
long durationSinceLastBump = millis() - lightIntensityBumpTimestamp;
float fadeFactor = 1 - ((float) durationSinceLastBump / LIGHT_FADE_OUT_DURATION);
fadeFactor = constrain(fadeFactor, 0, 1);
lightIntensityValue = lightIntensityBumpValue * fadeFactor;
lightIntensityValue = constrain(lightIntensityValue, 0, 1);
logValue("L", lightIntensityValue, 20);
// scale the intensity to be in range of maximum and minimum
float scaledLightIntensity = MINIMUM_LIGHT_INTENSITY + (lightIntensityValue * (MAXIMUM_LIGHT_INTENSITY - MINIMUM_LIGHT_INTENSITY));
int pinValue = 255 * scaledLightIntensity;
int rojoActual = rojo * scaledLightIntensity;
int verdeActual = verde * scaledLightIntensity;
int azulActual = azul * scaledLightIntensity;
pixels.setPixelColor(0, pixels.Color(rojoActual, verdeActual, azulActual));
pixels.show();
analogWrite(HAT_LIGHTS_PIN, pinValue);
// also use the builtin LED, for debugging when no lights are connected
if (scaledLightIntensity > MAXIMUM_LIGHT_INTENSITY - ((MAXIMUM_LIGHT_INTENSITY - MINIMUM_LIGHT_INTENSITY) / 4)) {
digitalWrite(LED_BUILTIN, HIGH);
} else {
digitalWrite(LED_BUILTIN, LOW);
}
// update the pulse signal
long durationSincePulse = millis() - lastPulseTimestamp;
fadeFactor = ((float) durationSincePulse / (LIGHT_PULSE_DURATION * 2));
if (durationSincePulse >= LIGHT_PULSE_DURATION) {
fadeFactor = 1 - fadeFactor;
}
fadeFactor *= 2;
fadeFactor = constrain(fadeFactor, 0, 1);
// scale the intensity to be in range of maximum and minimum
scaledLightIntensity = MINIMUM_LIGHT_INTENSITY + (fadeFactor * (MAXIMUM_LIGHT_INTENSITY - MINIMUM_LIGHT_INTENSITY));
//logValue("P", scaledLightIntensity, 10);
pinValue = 255 * scaledLightIntensity;
analogWrite(HAT_LIGHTS_PULSE_PIN, pinValue);
if (durationSincePulse >= LIGHT_PULSE_DELAY) {
lastPulseTimestamp = millis();
}
}
/**
* Converts the specified value into an ASCII-art progressbar
* with the specified length.
*/
String toProgressBar(float value, const int length) {
int amount = max(0, min(length, value * length));
String progressBar = "[";
for (int i = 0; i < amount; i++) {
progressBar += "=";
}
for (int i = 0; i < length - amount; i++) {
progressBar += " ";
}
progressBar += "]";
return progressBar;
}
void logValue(String name, boolean value) {
logValue(name, value ? 1.0 : 0.0, 1);
}
void logValue(String name, float value) {
logValue(name, value, 10);
}
void logValue(String name, float value, int length) {
Serial.print(" | " + name + ": " + toProgressBar(value, length));
}
