LCD 2004 Reference
A 20-column, 4-row character LCD with the same HD44780-compatible 16-pin interface as the LCD 1602, rendered larger.
Pin names
| Name | Description |
|---|---|
| VSS | Ground |
| VDD | Power (5V) |
| V0 | Contrast — tie to GND for max contrast in the simulator |
| RS | Register Select |
| RW | Read/Write — tie to GND to always write |
| E | Enable |
| D0–D7 | Data bus (only D4–D7 needed in 4-bit mode) |
| A | Backlight LED anode |
| K | Backlight LED cathode |
Attributes
This component has no configurable attributes.
Usage
Wiring is identical to the LCD 1602 — only the lcd.begin() call changes, from (16, 2) to
(20, 4).
#include <LiquidCrystal.h>
// RS, E, D4, D5, D6, D7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
lcd.begin(20, 4);
lcd.setCursor(0, 0); lcd.print("Row 0: Hello!");
lcd.setCursor(0, 1); lcd.print("Row 1: Arduino");
lcd.setCursor(0, 2); lcd.print("Row 2: LCD 2004");
lcd.setCursor(0, 3); lcd.print("Row 3: 20 x 4");
}
void loop() {}In real hardware, wire RW and V0 to GND, and power the backlight (A) through a 220 Ω resistor from 5V, with K to GND.
Examples
| Description | Attrs |
|---|---|
| Default 20×4 display | {} |
See also
- LCD 1602 — same interface, smaller 16×2 display
- SSD1306 OLED — graphical alternative using I²C instead of a parallel bus