LCD print arrays of Strings with millis();

Projects Programming
12

UKHeliBob:

 if (currentLCDMillis - previousLCDMillis > interval2)

Which of the two different variables named previousLCDMillis is this checking ?
The global one or the local one ?

Local one. Serial.println(currentLCDMillis - previousLCDMillis); shows values 0-2000ish and reseting.

Thanks PaulS, now it works.

#include <Wire.h>
#include <LiquidCrystal.h> // includes the LiquidCrystal Library 

LiquidCrystal lcd(32, 30, 28, 26, 24, 22);
//LiquidCrystal lcd_name(rs, en, d4, d5, d6, d7);

int previousLCDMillis = 0; //set first old time to 0

void setup() {
  //My LCD was 16x2
  lcd.begin (16, 2);
  lcd.home(); // go home
  Serial.begin(9600);
}

void loop() {
  //bunch of other stuff here

  kalba();
}
void kalba() {
  //function telling users they should select the language
  //four languages should switch between with the delay of 2 sec.

  unsigned long currentLCDMillis = millis(); //check current time
  unsigned long  interval2 = 2000;
  static unsigned long previousLCDMillis = 0; //set first old time to 0

  String languages[4] = {"Kalba?", "Language?", "Runa?", "Y3Ik?"};
  static int langCycle = 0; //cycle is 0, it is used and waits for millis to hit 2000
  if (currentLCDMillis - previousLCDMillis > interval2) {
    langCycle++;
    lcd.setCursor (6, 0);
    lcd.print("         ");         //delete the old text - DOES NOT WORK
    previousLCDMillis = currentLCDMillis;
  }
  lcd.setCursor (6, 0);
  lcd.print(languages[langCycle]);

//  Serial.println(langCycle);
//  Serial.println(currentLCDMillis - previousLCDMillis);

  if (langCycle == 4) {
    langCycle = 0;
  }
}