#include <U8g2lib.h>
#include <SPI.h>

#define GAIN      100
#define STEP      8
#define LOW_SOUND 50
#define MAX_SOUND 600

 
U8G2_GP1287AI_256X50_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8); 

  int strela=-36;
  int hMeter = 64;                      
  int vMeter = 85;                      
  int rMeter = 77;
  int ur,urr,x;

  int strelax =-36;
  int hMeterx = 194;                      
  int vMeterx = 85;                      
  int rMeterx = 77;
  int urx,urrx,xx;
 
void setup(void) {
  u8g2.begin(); 
  u8g2.setContrast(25); 
  u8g2.enableUTF8Print();
  u8g2.setFont(u8g2_font_4x6_tf);
  analogReference(INTERNAL);  // если очень маленький уровень сигнала
  pinMode(A2,INPUT);
  pinMode(A0,INPUT);
}

void loop (){
 
  strela = map(log(analogRead(A2))*GAIN, LOW_SOUND,MAX_SOUND, -36,36);
  strela = constrain(strela, -36, 36);
  urr = strela;if(urr<ur){ur=ur-STEP;}else{ur = strela;}  


  strelax = map(log(analogRead(A0))*GAIN, LOW_SOUND,MAX_SOUND, -36,36);
  strelax = constrain(strelax, -36, 36);
  urrx = strelax;if(urrx<urx){urx=urx-STEP;}else{urx = strelax;}  


  u8g2.firstPage();
  do { 
  u8g2.drawFrame(0,0,256,50);  
  u8g2.drawRFrame(130,2,124,46,3); 
  u8g2.drawRFrame(2,2,127,46,3);
  u8g2.drawLine(20, 15, 70, 15);// line 1
  u8g2.drawLine(150, 15, 200, 15);
  u8g2.drawLine(73, 15, 108, 15);
  u8g2.drawLine(203, 15, 238, 15);
  u8g2.drawLine(73, 14, 108, 14);// line 2
  u8g2.drawLine(203, 14, 238, 14);
  u8g2.drawLine(15, 17, 70, 17);// line3 
  u8g2.drawLine(145, 17, 200, 17); 

  byte b1_2[10]{20,57,42,33,64,91,50,70,77,104};
  byte c1_2[10]{12,14,14,12,14,12,12,12,12,12};
  for(int i=0;i<10;i++){u8g2.drawLine(b1_2[i], 15, b1_2[i], c1_2[i]);} 
  byte b3[5]{15,29,43,57,70};
  for(int i=0;i<5;i++){u8g2.drawLine(b3[i], 17, b3[i], 20);}


  byte b1x_2[10]{150,187,172,163,194,221,180,200,207,234};
  byte c1x_2[10]{12,14,14,12,14,12,12,12,12,12};
  for(int i=0;i<10;i++){u8g2.drawLine(b1x_2[i], 15, b1x_2[i], c1x_2[i]);} 
  byte b3x[5]{145,159,173,187,200};
  for(int i=0;i<5;i++){u8g2.drawLine(b3x[i], 17, b3x[i], 20);}
  

  u8g2.setCursor(17, 10); u8g2.print(F("20 10   3    0 1"));
  u8g2.setCursor(147, 10); u8g2.print(F("20 10   3    0 1"));
  u8g2.setCursor(14, 28); u8g2.print(F("0  25"));
  u8g2.setCursor(144, 28); u8g2.print(F("0  25"));
  u8g2.setCursor(40, 28);  u8g2.print(F("50"));
  u8g2.setCursor(170, 28);  u8g2.print(F("50"));
  u8g2.setCursor(55, 28);u8g2.print(F("75"));
  u8g2.setCursor(185, 28);u8g2.print(F("75"));
  u8g2.setCursor(68, 28);u8g2.print(F("100"));
  u8g2.setCursor(198, 28);u8g2.print(F("100"));
  u8g2.setCursor(90, 10);u8g2.print(F("2"));
  u8g2.setCursor(220, 10);u8g2.print(F("2"));
  u8g2.setCursor(103, 10);u8g2.print(F("3"));
  u8g2.setCursor(233, 10);u8g2.print(F("3"));
  
  u8g2.setCursor(14, 40); u8g2.print(F("-"));
  u8g2.setCursor(104, 40);u8g2.print(F("+"));
  u8g2.setCursor(44, 40);u8g2.print(F("VU meter"));
 
  u8g2.setCursor(90, 40);u8g2.print(F("L"));
  u8g2.drawFrame(88,33,7,9);
  
  u8g2.setCursor(144, 40); u8g2.print(F("-"));
  u8g2.setCursor(234, 40);u8g2.print(F("+"));
  u8g2.setCursor(174, 40);u8g2.print(F("VU meter"));

  u8g2.setCursor(220, 40);u8g2.print(F("R"));
  u8g2.drawFrame(218,33,7,9);

  int a1 = (hMeter + (sin(ur / 57.296) * rMeter)); // meter needle horizontal coordinate
  int a2 = (vMeter - (cos(ur / 57.296) * rMeter)); // meter needle vertical coordinate
  u8g2.drawLine(a1, a2, hMeter, vMeter);
 // u8g2.drawLine(a1-1, a2-1, hMeter-1, vMeter+1);


  int a1x = (hMeterx + (sin(urx / 57.296) * rMeterx)); // meter needle horizontal coordinate
  int a2x = (vMeterx - (cos(urx / 57.296) * rMeterx)); // meter needle vertical coordinate
  u8g2.drawLine(a1x, a2x, hMeterx, vMeterx);
 // u8g2.drawLine(a1x-1, a2x-1, hMeterx-1, vMeterx+1);


  
  } while ( u8g2.nextPage() );  
  
}