About this tool site

The HD44780 is a controller for character-based liquid crystal displays (LCDs). In addition to the standard pre-programmed characters, it allows you to define up to eight of your own graphic patterns on a 5x8 (or sometimes 5x7 - not released on it) grid. This page lets you experiment with various patterns in symbols generator and shows the code that need to be programmed into the controller to get those patterns on to the display. Also you can emulate views of LCD panels with different size, colors and code pages.

Source code is open under MIT license. See on GitHub

Some Wiki and how-to info about HD44780 controllers.

Full LCD codepage

Custom symbol generator

Selected:

{parallel_bus}#include <LiquidCrystal.h>

//parallel bus
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);{/parallel_bus}{I2C_bus}#include <LiquidCrystal_I2C.h>

//1-wire bus--------->address 
LiquidCrystal_I2C lcd(0x3F, {columns}, {rows});{/I2C_bus}
const uint8_t char_map[8][8] PROGMEM = {{customCharArrays}
    {{symbol_data}},{/customCharArrays}
}

void setup() {
    {I2C_bus}lcd.init();{/I2C_bus}{parallel_bus}lcd.begin({columns}, {rows});{/parallel_bus}
    for (uint8_t i = 0; i < 8; i++) {
        lcd.createChar(i, (char*)char_map[i]);
    }
    lcd.home();
    for (uint8_t i = 0; i < 8; i++) {
        lcd.write(i);
    }
}

void loop() { }

Global LCD panel settings

Panel size

Standart types:

Rows:

Columns:

Colors

Back light:

Pixels:

Pixels and breaks size

Pixel size: px

Break size: px

Autosave state every 5 sec

Test views