Description

The 20×4 LCD Module is a popular alphanumeric display module based on the HD44780 controller, capable of displaying 20 characters per line on 4 lines. It supports 4-bit or 8-bit parallel communication and can be interfaced directly with microcontrollers using digital I/O pins or via I2C with an adapter. It is widely used in DIY electronics, IoT, robotics, and embedded systems for displaying text, sensor readings, system status, and menus. Its backlight provides clear visibility in low-light conditions, and it’s compact enough for integration into custom enclosures.

Key Features

• 20 characters × 4 lines display

• HD44780 or compatible controller

• Backlight for better visibility

• Supports 4-bit and 8-bit parallel interface

• Compatible with Arduino, ESP32, and Raspberry Pi

• I2C interface available with adapter for simplified wiring

Variants

• Standard 20×4 LCD (parallel interface)

• 20×4 LCD with I2C adapter (simpler connection)

Specifications

Applications

• Arduino, ESP32, and Raspberry Pi projects

• Sensor data display (temperature, humidity, etc.)

• Menu-driven interfaces for embedded systems

• Robotics and automation feedback screens

• DIY IoT dashboards and monitoring systems

Compatible Boards / Circuits

• Arduino Uno, Mega, Nano

• ESP32 / ESP8266

• Raspberry Pi (GPIO or I2C)

• Any microcontroller supporting 4-bit/8-bit or I2C LCD communication