项目代码
- // Copyright (c) 2019 Shajeeb TM
- // HAZI TECH
- // Updated by Hasitha Jayasundara
- // Visit my YouTube Channel - http://www.youtube.com/c/HAZITECH?sub_confirmation=1
-
- #include <arduinoFFT.h>
- #include <MD_MAX72xx.h>
- #include <SPI.h>
- #include <EEPROM.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 audio_response = 20; // put a value between 10 and 80. Smaller the number, higher the audio response
-
- 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
-
- double vReal[SAMPLES];
- double vImag[SAMPLES];
- char data_avgs[xres];
-
- int yvalue;
- int displaycolumn , displayvalue;
- int peaks[xres];
- const int buttonPin = 6; // 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;
- 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() {
- EEPROM.update(1,1); //(memory address, value), RUN THIS FOR THE FIRST TIME
- displaymode = EEPROM.read(1);
- 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,audio_response); // set max & min values for buckets
- data_avgs[i] = map(data_avgs[i], 0, audio_response, 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
-
- int reading = digitalRead(buttonPin);
- if (reading == LOW)
- {
- switch (displaymode)
- {
- case 1: // move from mode 1 to 2
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_2[i];
- }
- break;
- case 2: // move from mode 2 to 3
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_3[i];
- }
- break;
- case 3: // move from mode 3 to 4
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_4[i];
- }
- break;
- case 4: // move from mode 4 to 1
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_1[i];
- }
- break;
- }
- }
- }
-
- 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;
- EEPROM.update(1,2);
- 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;
- EEPROM.update(1,3);
- 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;
- EEPROM.update(1,4);
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_4[i];
- }
- break;
- case 4: // move from mode 4 to 1
- displaymode = 1;
- EEPROM.update(1,1);
- for (int i=0 ; i<=8 ; i++ ) {
- MY_ARRAY[i]=MY_MODE_1[i];
- }
- break;
- }
- lastDebounceTime = millis();
- }
- previousState = reading;
- }
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