#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code
AudioPlaySdWav playSdWav1; //xy=97,241
AudioFilterBiquad highBand; //xy=386,184
AudioFilterBiquad midBand; //xy=386,226
AudioFilterBiquad lowBand; //xy=387,268
AudioSynthWaveformDc gainH; //xy=410,52
AudioSynthWaveformDc gainM; //xy=416,97
AudioSynthWaveformDc gainL; //xy=420,138
AudioEffectMultiply multH; //xy=619,113
AudioEffectMultiply multM; //xy=621,152
AudioEffectMultiply multL; //xy=623,190
AudioMixer4 mixer; //xy=831,158
AudioOutputI2S audioOutput; //xy=1012,158
AudioConnection patchCord1(playSdWav1, 0, highBand, 0);
AudioConnection patchCord2(playSdWav1, 0, midBand, 0);
AudioConnection patchCord3(playSdWav1, 0, lowBand, 0);
AudioConnection patchCord4(highBand, 0, multH, 1);
AudioConnection patchCord5(midBand, 0, multM, 1);
AudioConnection patchCord6(lowBand, 0, multL, 1);
AudioConnection patchCord7(gainH, 0, multH, 0);
AudioConnection patchCord8(gainM, 0, multM, 0);
AudioConnection patchCord9(gainL, 0, multL, 0);
AudioConnection patchCord10(multH, 0, mixer, 2);
AudioConnection patchCord11(multM, 0, mixer, 1);
AudioConnection patchCord12(multL, 0, mixer, 0);
AudioConnection patchCord13(mixer, 0, audioOutput, 0);
AudioConnection patchCord14(mixer, 0, audioOutput, 1);
AudioControlSGTL5000 sgtl5000_1; //xy=1030,215
// GUItool: end automatically generated code
// Constants for band indices
#define LOW_BAND 0
#define MID_BAND 1
#define HIGH_BAND 2
// Define pin numbers
const int potPin = A0; // Potentiometer pin
const int buttonPin = 2; // Push button pin
int currentBand = LOW_BAND; // Start with adjusting the low band
bool lastButtonState = LOW; // Last state of the button
bool buttonPressed = false; // Flag for button press
void setup() {
// Initialize serial communication for debugging (optional)
Serial.begin(9600);
while (!Serial); // Wait for Serial monitor to open
pinMode(buttonPin, INPUT_PULLUP); // Set button pin as input with pullup
// Allocate memory for audio processing
AudioMemory(12);
// Enable and configure audio codec
sgtl5000_1.enable();
sgtl5000_1.volume(0.5);
if (!(SD.begin(BUILTIN_SDCARD))) {
// stop here, but print a message repetitively
while (1) {
Serial.println("Unable to access the SD card");
delay(500);
}
}
// Setup EQ filters
setupEQBands();
// Set initial gains for each band (in dB)
setBandGain(LOW_BAND, 0.0); // 0 dB
setBandGain(MID_BAND, 0.0); // 0 dB
setBandGain(HIGH_BAND, 0.0); // 0 dB
mixer.gain(0, 2.0f);
mixer.gain(1, 2.0f); // add 6dB of gain that multiplier can't do
mixer.gain(2, 2.0f);
const char * filename = "ATMOSPHERE.wav";
playSdWav1.play(filename);
}
void loop() {
static int lastPotValue = 0;
int potValue = analogRead(potPin);
if (potValue != lastPotValue){
float gainValue = map(potValue, 0, 1023, -26.1, 6.0);
Serial.printf("db: %f \n", gainValue);
setBandGain(currentBand, gainValue);
lastPotValue = potValue;
}
// Check if the button is pressed
bool buttonState = digitalRead(buttonPin);
if (buttonState == LOW && lastButtonState == HIGH && !buttonPressed) {
// Button press detected, toggle the band
currentBand = (currentBand + 1) % 3; // Cycle through 0, 1, 2
buttonPressed = true; // Set flag to avoid multiple toggles
Serial.print("Switched to band: ");
Serial.println(currentBand);
}
// Reset button pressed flag when button is released
if (buttonState == HIGH && lastButtonState == LOW) {
buttonPressed = false;
}
// Save the current button state for the next loop
lastButtonState = buttonState;
delay(100); // Adjust as needed
}
void setupEQBands() {
// Configure low band
lowBand.setLowpass(0, 100, 0.707); // Butterworth filter
// Configure mid band
midBand.setBandpass(0, 1000, 1.0); // Q=1.0 covers approx. 1 octave
// Configure high band
highBand.setHighpass(0, 13000, 0.707); // Butterworth filter
}
void setBandGain(uint8_t band, float dB) {
float transTime = 10.0f; // gain transition time in milliseconds
// Constrain dB value between -infinity (-60 dB for practical purposes) and +6 dB
if (dB < -26.0) dB = -26.0; // no point, this is caught later!
if (dB > 6.0) dB = 6.0;
// Convert dB to linear gain
float linearGain;
if (dB <= -26.0) {
linearGain = 0.0; // Practically silence
} else {
linearGain = pow(10.0, dB / 20.0);
}
linearGain /= 2; // mixer is set to gain of 2.0 (linear)
// Set gain on mixer
switch (band)
{
case 0: gainL.amplitude(linearGain,transTime); break;
case 1: gainM.amplitude(linearGain,transTime); break;
case 2: gainH.amplitude(linearGain,transTime); break;
}
}
First stage is quad input for the two channels
