#include <Arduino.h>
#include <RotaryEncoder.h>
#include <LiquidCrystal_I2C.h>

#define PIN_IN1 3
#define PIN_IN2 2

int newPosition, oldPosition, position;
unsigned int amount;

LiquidCrystal_I2C lcd(0x27, 16, 2);
RotaryEncoder encoder(PIN_IN1, PIN_IN2, RotaryEncoder::LatchMode::FOUR3);

void checkPosition()
{
  encoder.tick();
  newPosition = encoder.getPosition();
}


void setup()
{
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.print("PollRotatorLCD");

  attachInterrupt(digitalPinToInterrupt(PIN_IN1), checkPosition, CHANGE);
  attachInterrupt(digitalPinToInterrupt(PIN_IN2), checkPosition, CHANGE);
} 


void loop()
{
  if (newPosition != oldPosition) {
    oldPosition = newPosition;
    position = position + newPosition;
    encoder.setPosition(0);
    newPosition = 0;
    if (position < 0) {
      position = 0;
    }
    amount = position * 1000;
    lcd.setCursor(0, 1); 
    lcd.print(amount);
    lcd.print("    ");
  }
}