#include <LiquidCrystal.h>
//LiquidCrystal lcd(PA8, PA15, PB15, PB14, PB13, PB12);  //STM32F
LiquidCrystal lcd(12, 11, 10, 9, 8, 7); // UNO FOR SIMULATOR ONLY

unsigned int val = 0;
unsigned int val1 = 0; //%
unsigned int val2 = 0;//LTR
unsigned int val3 = 0;//KM
unsigned int val_old = 1;
byte graph [5][8] = {                     // new LCD chars: |, ||, |||, ||||, |||||
  {0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00},  // 1 vertical line
  {0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00},  // 2 vertical lines
  {0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x00},  // 3 vertical lines
  {0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x00},  // 4 vertical lines
  {0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00}   // 5 vertical lines
};
//---------------------------------------------------------------------------------------------------------
void setup() {
  pinMode(A0, INPUT);                     // pin A0 as input
  //lcd.begin(16, 2);                       // LCD initialization
  lcd.begin(20,4);  
  lcd.clear();
  
  for (byte k = 0; k < 5; k++)            // new 5 LCD chars
    lcd.createChar(k, graph[k]);
}
//---------------------------------------------------------------------------------------------------------
void loop() {
  
  
   val = analogRead(A0);
   val1 = val/10;
  lcd.setCursor(0,0);  
 
  lcd.print(val1);
  lcd.setCursor(6,0);
  lcd.print("% ");
  if (val_old != val) {
    draw_bar(val + 1);
    val_old = val;
  }
}
//---------------------------------------------------------------------------------------------------------
void draw_bar(unsigned int m_val) {
  byte a;                                 // block
  byte b;                                 // lines in block
  byte m;                                 // local counter

  lcd.setCursor(0, 3);
    //lcd.print("[ ");
  lcd.setCursor(18, 3);
    //lcd.print("]");
  lcd.setCursor(8, 3);
  a = m_val / 255;       //1023 / 255 = 4;  // 1024 / 64 = 16 black blocks
  for (m = 0; m < a; m++)
    lcd.write(4);

  b = (10 * (m_val - a * 255)) / 512;      // (64 / 5) * 10, last box: vertical lines
  if (b > 0)
    lcd.write(b - 1);
  else
    lcd.write(' ');                       // blank block

  for (m = a + 1; m < 4; m++)        //16    // blank left spaces 16
    lcd.write(' ');
    //delay(100);
}