lcd.ino

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int buttonState = 0;

int program = 1;
int programs = 1;

int a = 1;

byte man_1[8] = {
  0x01,
  0x05,
  0x0E,
  0x14,
  0x14,
  0x04,
  0x0A,
  0x0A
};

byte man_2[] = {
  0x02,
  0x05,
  0x0E,
  0x14,
  0x14,
  0x04,
  0x0A,
  0x0A
};

void setup() {
  pinMode(2, INPUT);
  Serial.begin(9600);
  
  lcd.begin();
  lcd.createChar(1, man_1);
  lcd.createChar(2, man_2);
  lcd.home();
  lcd.backlight();
  
}

void loop() {  
  buttonState = digitalRead(2);

  if (buttonState == HIGH) {
    if (program > programs) {
      program = 1;
    } else {
      program++;
    }
  }

  switch (program){
    case 1:
      if (a == 1) {
        a = 2;
        lcd.print("Hello, world! ");
        lcd.write(2);
      } else {
        a = 1;
        lcd.print("Hello, world! ");
        lcd.write(1);
      }
      
      delay(600);
      lcd.clear();
    default:
      Serial.print("");
  }
    lcd.setCursor(0,1);
    lcd.print("Program nr: ");
    lcd.print(program);
    lcd.print("/");
    lcd.print(programs);
    lcd.setCursor(0,0);
}