test_vu

/*
 * Arduino Sound Meter
 */
 //--------------------------------------------------------------------------------------------
 //                                          LIBRARIES
 //--------------------------------------------------------------------------------------------
#include <Wire.h>
#include <SPI.h>                                          //SPI Library for OLED
#include <Adafruit_GFX.h>                                 //Graphics library for OLED
#include <Adafruit_SH1106.h>                              //OLED Driver

//--------------------------------------------------------------------------------------------
 //                                           DEFINES
 //--------------------------------------------------------------------------------------------
#define OLED_RESET -1                  // reset required for SH1106 4


 /*
#define OLED_MOSI   9                                     //SoftSPI MOSI on D9
#define OLED_CLK   10                                     //SoftSPI CLK on D10
#define OLED_DC    11                                     //SoftSPI DC on D11
#define OLED_CS    12                                     //SoftSPI CS on D12
#define OLED_RESET 13                                     //OLED Reset in d13
*/
//--------------------------------------------------------------------------------------------
 //                                        LIBRARY
 //--------------------------------------------------------------------------------------------
 Adafruit_SH1106 display(OLED_RESET);  // reset required for SH1106
                                                          //Create instance of OLED called display
//Adafruit_SH1106 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

//--------------------------------------------------------------------------------------------
 //                                       GLOBAL VARIABLES
 //--------------------------------------------------------------------------------------------

const int sampleWindow = 50;                              // Sample window width in mS (50 mS = 20Hz) 50
unsigned int sample;
const int sample1Window = 250;                              // Sample window width in mS (50 mS = 20Hz) 50
unsigned int sample1;

 //--------------------------------------------------------------------------------------------
 //                                            SETUP
 //--------------------------------------------------------------------------------------------

void setup()
{
   Serial.begin(9600);                                    //Serial comms for debugging
   display.begin(SH1106_SWITCHCAPVCC);                    //OLED display start
   display.display();                                     //show buffer
   display.clearDisplay();                                //clear buffer
   display.setRotation(1);
   display.setTextSize(1);                                //Set text size to 1 (1-6)
   display.setTextColor(WHITE);                           //Set text color to WHITE (no choice lol)
   display.setCursor(0,0);                                //cursor to upper left corner
   display.println(" VU Meter");               //write title
   display.display();                                     //show title
   delay(2000);                                           //wait 2 seconds
}

//--------------------------------------------------------------------------------------------
 //                                         LOOP
 //--------------------------------------------------------------------------------------------

void loop()
{
   unsigned long startMillis= millis();                   // Start of sample window
   float peakToPeak = 0;                                  // peak-to-peak level

   unsigned int signalMax = 0;                            //minimum value
   unsigned int signalMin = 1024;                         //maximum value

                                                          // collect data for 50 mS
   while (millis() - startMillis < sampleWindow)
   {
      sample = analogRead(0);                             //get reading from microphone
      if (sample < 1024)                                  // toss out spurious readings 1024
      {
         if (sample > signalMax)
         {
            signalMax = sample;                           // save just the max levels
         }
         else if (sample < signalMin)
         {
            signalMin = sample;                           // save just the min levels
         }
      }
   }
   peakToPeak = signalMax - signalMin;                    // max - min = peak-peak amplitude
   float db = map(peakToPeak,0,124,0,124);             //kalibrovat pro deciBels float db = map(peakToPeak,20,900,49.5,90); map(peakToPeak,0,124,0,124);
   float db1 = map(peakToPeak,100,900,0,200);
   display.setRotation(1);
   display.setCursor(10,0);                                //cursor to upper left
   display.setTextSize(1);                                //set text size to 2
   display.print(db1);                                     //write calibrated deciBels
   display.print(" dB");                                  //write units

display.setRotation(0);
    for(int x =5;x<114;x=x+6){                            //nakreslete měřítko
      display.drawLine(x, 35, x, 27, WHITE);
    }

   display.drawRoundRect(0, 12, 120, 40, 0, WHITE);       //nakreslete obrys sloupcového grafu
   int r = map(db,0,120,1,120);                           //nastavit sloupcový graf pro šířku obrazovky
   int r1 = map(db,0,120,1,120);
   display.fillRoundRect(1,13,r,38,0,WHITE);         //nakreslete sloupcový graf o šířce r (1, 13, r, 38, 0, WHITE)  display.fillRoundRect(1,13,r,38,0,WHITE);

 //  if (millis()%4 == 0)
//   display.drawRoundRect(1,13,r1,38,0,WHITE);
   display.display();                                     //show all that we just wrote & drew
   display.clearDisplay();                                //clear the display
}