#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
#define PIN_POT A2
#define PIN_BUTTON  7


//definieer toestanden
#define IDLE 0
#define CHANGE_SCALE 1
#define BLANK_SCREEN 2



// declaratie variabelen
byte aantalKol;
byte oudeAantalKol = 0;
byte stateLcd = IDLE;

// declareer functies
void tekenPotBar ();


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


uint8_t char0[8] = { 0, 0, 0, 0, 0, 0, 0, 0}; //10000
uint8_t char1[8] = { 16, 16, 16, 16, 16, 16, 16, 16}; //10000
uint8_t char2[8] = { 24, 24, 24, 24, 24, 24, 24, 24}; //11000
uint8_t char3[8] = { 28, 28, 28, 28, 28, 28, 28, 28}; //11100
uint8_t char4[8] = { 30, 30, 30, 30, 30, 30, 30, 30}; //11110
uint8_t char5[8] = { 31, 31, 31, 31, 31, 31, 31, 31}; //11111




void setup() {
  Serial.begin(9600);
  pinMode(A2, INPUT);
  // Init
  lcd.init();
  lcd.backlight();

  /* Print something
    lcd.setCursor(2, 1);
    lcd.print("Wokwi Rocks!");
  */


  lcd.createChar(0, char0);
  lcd.createChar(1, char1);
  lcd.createChar(2, char2);
  lcd.createChar(3, char3);
  lcd.createChar(4, char4);
  lcd.createChar(5, char5);






}


void loop() {

  aantalKol = map(analogRead(PIN_POT), 0, 1023, 0, 80);

  Serial.print(analogRead(A2));
  Serial.print (" ");
  Serial.print (map(analogRead(PIN_POT), 0, 1023, 0, 80));
  Serial.print(" ");
  Serial.println (map(analogRead(PIN_POT), 0, 1023, 0, 80) / 5);
  //lcd.begin(1, 0);
  switch (stateLcd) {
    case IDLE:     //nietsdoen
      if (aantalKol != oudeAantalKol) {
        //achtergrond aansteken
        stateLcd = CHANGE_SCALE;
      }// nieuwe status = change scale
      if (PIN_BUTTON == 0) {
        stateLcd = BLANK_SCREEN;
      }
      break;
    case CHANGE_SCALE: // pot meter inlezen en schaal aanpassen
      tekenPotBar ();
      stateLcd = IDLE;
      break;
    case BLANK_SCREEN:     //scherm leeg maken
      lcd.clear();
      delay(30);
      stateLcd = IDLE;
      break;
    default:
      break;
  }
  oudeAantalKol = aantalKol;
}


void tekenPotBar() {
  Serial.print("tekenpotbar");
  delay (100);
  aantalKol = map(analogRead(PIN_POT), 0, 1023, 0, 80);
  lcd.setCursor(0, 0);
  for (int i = 0 ; i < aantalKol / 5; i++) {
    lcd.print(char(255));
  }
  lcd.print(char(aantalKol % 5));
  for (int i = (aantalKol  / 5); i < 16; i++) {
    lcd.print(char(254));
  }
}