【Arduino 动手做】32（线性）/11（伪对数）频谱分析仪
该项目基于 Shajeeb 的项目，使用 Arduino 制作音频（音乐）频谱分析仪/可视化器。这是我第一次尝试搭建Arduino项目。我对任何与音频项目相关的内容都很感兴趣。我找到了Shajeeb的音频可视化工具，尝试让显示屏上的刻度有所不同。有点像对数函数，但我只是在Excel里创建了一些（对数/指数）表格，然后在项目代码中手动实现了数据映射。
添加/修改更改显示的按钮：单条（线性刻度显示/双条-伪对数）。
希望你喜欢它，享受构建。
【Arduino 动手做】32（线性）/11（伪对数）波段音频频...
项目代码// Modified code by Christian Suryanto, from (c) 2019 Shajeeb TM
// HAZI TECH
// Updated by Christian Suryanto
//
#include <arduinoFFT.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <EEPROM.h>
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW // Set display typeso thatMD_MAX72xx library treets it properly
#define CLK_PIN 13 // Clock pin to communicate with display
#define DATA_PIN11 // Data pin to communicate with display
#define CS_PIN 10 // Control pin to communicate with display
#define SAMPLES 64 // Must be a power of 2
#define MAX_DEVICES4 // Total number display modules
#definexres 32 // Total number ofcolumns in the display, must be <= SAMPLES/2
#defineyres 8 // Total number ofrows in the display
#define PREV 0xFF02FD // address is FFA25D but 0x is added because this is how the arduino is told that it is HEXADECIMAL.
#define NEXT 0xFFC23D // control stop code
#define PWR 0xFFA25D // control Power
int audio_response = 35; // put a value between 10 and 80. Smaller the number, higher the audio response
double vReal;
//double vReal2;
double vImag;
char data_avgs;
int yvalue;
int displaycolumn , displayvalue;
int peaks;
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
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
bool EQ_ON = true; // set to false to disable eq
byte eq1 = {40, 45, 50, 60, 65, 70, 75, 95,
110, 110, 110, 110, 110, 110, 110, 110,
130, 130, 130, 130, 130, 130, 130, 130,
145, 155, 170, 180, 215, 220, 245, 255
};
byte eq2 = {40, 70, 75, 110, 110, 140, 145, 220, 220, 230, 250};
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);
//displaymode = 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
mx.control(MD_MAX72XX::INTENSITY, 0); // set LED intensity
delay(50); // wait to get reference voltage stabilized
}
void loop() {
// ++ Sampling
int numData;
double rSum;
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
value = value / 8;
vReal= value; // Copy to bins after compressing
vImag = 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
int step = (SAMPLES)/xres;
// re-mapping data - Customize by Christian Suryanto ///
switch (displaymode)
{
case 1 :
{
numData = 32;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal)/2;
}
break;
case 2 :
{
numData = 11;
data_avgs = (vReal + vReal)/2;
data_avgs = (vReal + vReal + vReal + vReal) / 4;
data_avgs = ( vReal + vReal + vReal + vReal + vReal + vReal)/6;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal)/6;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal)/6;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal)/8;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal)/8;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal)/6;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal)/8;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal)/10;
data_avgs = (vReal + vReal + vReal + vReal + vReal + vReal + vReal + vReal)/8;
}
break;
}
// re-mapping data - Customize by Christian Suryanto ///
for(int i=0; i<numData; i++)
{
data_avgs = data_avgs / 2;
if (EQ_ON)
switch (displaymode)
{
case 1 : data_avgs = (data_avgs) * (float)(eq1) / 100; //apply eq filter
break;
case 2 : data_avgs = (data_avgs) * (float)(eq2) / 100; //apply eq filter
break;
}
data_avgs = constrain(data_avgs,0,audio_response); // set max & min values for buckets
data_avgs = map(data_avgs, 0, audio_response, 0, yres); // remap averaged values to yres
yvalue=data_avgs;
peaks = peaks-1; // decay by one light
if (yvalue > peaks)
peaks = yvalue ;
yvalue = peaks;
displayvalue=MY_ARRAY;
switch (displaymode)
{
case 1:
{
displaycolumn=31-i;
mx.setColumn(displaycolumn, displayvalue); // for left to right
}
break;
case 2:
{
displaycolumn=31-(3*i);
mx.setColumn(displaycolumn-1, displayvalue); // for left to right
mx.setColumn(displaycolumn, displayvalue); // for left to right
}
break;
}
}
// -- 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;
mx.clear();
delay(200);
EEPROM.update(1,2);
break;
case 2: // move from mode 2 to 3
displaymode = 1;
mx.clear();
delay(200);
EEPROM.update(1,1);
break;
}
lastDebounceTime = millis();
}
previousState = reading;
}
【Arduino 动手做】32（线性）/11（伪对数）波段音频频...
【Arduino 动手做】32（线性）/11（伪对数）波段音频频谱分析仪项目链接：https://www.hackster.io/chrissurya/32-linier-11-pseudo-log-band-audio-spectrum-analyzer-8e8c7b
项目作者：克里苏里亚
项目代码：https://www.hackster.io/code_files/559275/download
页:
[1]