LCD 2004 20x4 Character LCD Display Module HD44780 Controller blue screen backlight forarduino

The LCD 2004 20x4 Character LCD Display Module is a versatile blue-backlight screen designed for displaying clear text in your electronics projects. Powered by the industry-standard HD44780 controller, this module is ideal for South African students, makers, and hobbyists building Arduino-based readouts. It provides a spacious four-row layout to monitor sensor data, system statuses, or custom messages.

Spacious four-row character layout

This module features a 20x4 character grid, allowing you to display up to 80 characters of text simultaneously. It is configured in software using the standard LiquidCrystal library with a simple initialization call.

Industry-standard HD44780 pin configuration

The display utilises a standard interface, mapping register select, read/write, and enable pins to your microcontroller. Data is transmitted via a 4-bit interface using pins d4, d5, d6, and d7 for efficient pin usage.

Integrated backlight control

The blue screen backlight can be controlled directly via a digital I/O pin, such as Arduino pin 13. You can easily turn the backlight on or off in your code by writing the control pin high or low.

Safe current limiting and contrast adjustment

To prevent excessive current draw, a current limiting resistor or potentiometer of at least 40 Ohms must be used. Connecting a potentiometer's centre pin to LCD pin 3 allows you to adjust the screen contrast.

Simple software integration

The display is fully compatible with standard Arduino driver code and the LiquidCrystal library. You can quickly upload example programmes to clear the screen, position the cursor, and print custom text.