Arduino_all_LCD_chars.ino

#include <SPI.h>
#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(21, 48, 47, 38, 39, 40, 41, 42, 2, 1);

void setup() {
  lcd.begin(20, 4);
  lcd.setCursor(0, 3);
}

int col = 0;
int row = 0;
int ch = 0;

void loop() {
  lcd.setCursor(col, row);
  lcd.print(" ");
  lcd.setCursor(col, row);
  lcd.print(char(ch));
  if (col < 19) {
    col++;
  } else if (row < 3) {
    col = 0;
    row++;
  } else {
    row = 0;
    col = 0;
  }
  ch = (ch + 1) % 256;
  delay(100);
}