#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
}

int pot = 0;
int prev_pos = -1;

void loop() {
//  int pot = analogRead(A0);

  int pos_pot = pot/(1024.0/210);

  lcd.setCursor(0, 1);
  lcd.print("                ");
  lcd.setCursor(0, 1);
  lcd.print(pot); lcd.print(" = "); lcd.print(pos_pot);
  if (pos_pot != prev_pos) {
    prev_pos = pos_pot;
    Serial.print(pot); Serial.print(" = "); Serial.println(pos_pot);
  }
  if (pot < 1023) {
    ++pot;
  }
  //delay(500);
}