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Arduino-32band-audio-spectrum-visualizer-analyzer.ino
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Arduino-32band-audio-spectrum-visualizer-analyzer.ino
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/*
Copyright (c) 2019 Shajeeb TM
https://github.com/shajeebtm/Arduino-audio-spectrum-visualizer-analyzer/
https://create.arduino.cc/projecthub/Shajeeb/32-band-audio-spectrum-visualizer-analyzer-902f51
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <arduinoFFT.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#define SAMPLES 64 //Must be a power of 2
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW // Set display type so that MD_MAX72xx library treets it properly
#define MAX_DEVICES 4 // Total number display modules
#define CLK_PIN 13 // Clock pin to communicate with display
#define DATA_PIN 11 // Data pin to communicate with display
#define CS_PIN 10 // Control pin to communicate with display
#define xres 32 // Total number of columns in the display, must be <= SAMPLES/2
#define yres 8 // Total number of rows in the display
int MY_ARRAY[]={0, 128, 192, 224, 240, 248, 252, 254, 255}; // default = standard pattern
int MY_MODE_1[]={0, 128, 192, 224, 240, 248, 252, 254, 255}; // standard pattern
int MY_MODE_2[]={0, 128, 64, 32, 16, 8, 4, 2, 1}; // only peak pattern
int MY_MODE_3[]={0, 128, 192, 160, 144, 136, 132, 130, 129}; // only peak + bottom point
int MY_MODE_4[]={0, 128, 192, 160, 208, 232, 244, 250, 253}; // one gap in the top , 3rd light onwards
int MY_MODE_5[]={0, 1, 3, 7, 15, 31, 63, 127, 255}; // standard pattern, mirrored vertically
double vReal[SAMPLES];
double vImag[SAMPLES];
char data_avgs[xres];
int yvalue;
int displaycolumn , displayvalue;
int peaks[xres];
const int buttonPin = 5; // the number of the pushbutton pin
int state = HIGH; // the current reading from the input pin
int previousState = LOW; // the previous reading from the input pin
int displaymode = 1;
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers
MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES); // display object
arduinoFFT FFT = arduinoFFT(); // FFT object
void setup() {
ADCSRA = 0b11100101; // set ADC to free running mode and set pre-scalar to 32 (0xe5)
ADMUX = 0b00000000; // use pin A0 and external voltage reference
pinMode(buttonPin, INPUT);
mx.begin(); // initialize display
delay(50); // wait to get reference voltage stabilized
}
void loop() {
// ++ Sampling
for(int i=0; i<SAMPLES; i++)
{
while(!(ADCSRA & 0x10)); // wait for ADC to complete current conversion ie ADIF bit set
ADCSRA = 0b11110101 ; // clear ADIF bit so that ADC can do next operation (0xf5)
int value = ADC - 512 ; // Read from ADC and subtract DC offset caused value
vReal[i]= value/8; // Copy to bins after compressing
vImag[i] = 0;
}
// -- Sampling
// ++ FFT
FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
// -- FFT
// ++ re-arrange FFT result to match with no. of columns on display ( xres )
int step = (SAMPLES/2)/xres;
int c=0;
for(int i=0; i<(SAMPLES/2); i+=step)
{
data_avgs[c] = 0;
for (int k=0 ; k< step ; k++) {
data_avgs[c] = data_avgs[c] + vReal[i+k];
}
data_avgs[c] = data_avgs[c]/step;
c++;
}
// -- re-arrange FFT result to match with no. of columns on display ( xres )
// ++ send to display according measured value
for(int i=0; i<xres; i++)
{
data_avgs[i] = constrain(data_avgs[i],0,80); // set max & min values for buckets
data_avgs[i] = map(data_avgs[i], 0, 80, 0, yres); // remap averaged values to yres
yvalue=data_avgs[i];
peaks[i] = peaks[i]-1; // decay by one light
if (yvalue > peaks[i])
peaks[i] = yvalue ;
yvalue = peaks[i];
displayvalue=MY_ARRAY[yvalue];
displaycolumn=31-i;
mx.setColumn(displaycolumn, displayvalue); // for left to right
}
// -- send to display according measured value
displayModeChange (); // check if button pressed to change display mode
}
void displayModeChange() {
int reading = digitalRead(buttonPin);
if (reading == HIGH && previousState == LOW && millis() - lastDebounceTime > debounceDelay) // works only when pressed
{
switch (displaymode) {
case 1: // move from mode 1 to 2
displaymode = 2;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_2[i];
}
break;
case 2: // move from mode 2 to 3
displaymode = 3;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_3[i];
}
break;
case 3: // move from mode 3 to 4
displaymode = 4;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_4[i];
}
break;
case 4: // move from mode 4 to 5
displaymode = 5;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_5[i];
}
break;
case 5: // move from mode 5 to 1
displaymode = 1;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_1[i];
}
break;
}
lastDebounceTime = millis();
}
previousState = reading;
}