LCD 2004 Module 20×4

The LCD 2004 Module 20×4 is a large, clear character display designed to present up to 80 characters (20 columns × 4 rows) in crisp white text against a vibrant blue backlight. Perfect for Arduino, Raspberry Pi, ESP32, and other microcontrollers, it’s the ideal solution for data logging, sensor readouts, menus, and IoT status screens.

This module supports both parallel interface and I²C backpack compatibility, reducing pin usage and simplifying wiring for advanced projects.

🔹 Key Features

• 20×4 Character Display: Shows 4 lines of 20 characters each for detailed information.

• Bright Blue Backlight: High-contrast white text for excellent readability in any lighting.

• HD44780 Controller: Industry-standard chipset ensures broad library support.

• Optional I²C Interface: Use with an I²C backpack to reduce connections to just 4 wires.

• Adjustable Contrast: Onboard potentiometer for easy brightness and contrast tuning.

🔹 Technical Specifications

• Display Format: 20 columns × 4 rows (alphanumeric)

• Controller IC: HD44780 or compatible

• Supply Voltage: 5 V DC

• Logic Voltage: 5 V (3.3 V logic-compatible with level shifting)

• Interface: Parallel (4-bit or 8-bit), optional I²C with backpack

• Character Size: ~5.55 mm × 8.55 mm

• Backlight Color: Blue with white characters

• Operating Temperature: –20 °C to +70 °C

• Dimensions: ~98 mm × 60 mm × 12 mm

• Viewing Area: ~76 mm × 26 mm

🔹 Applications & Use Cases

• IoT Dashboards: Show real-time data from NodeMCU or ESP32 devices.

• Arduino Projects: Perfect for Arduino and Accessories to display sensor readings or menus.

• Home Automation: Display temperature, humidity, and system status.

• Robotics & Drones: Provide live telemetry or battery stats for Drones and robots.

• Industrial Control Panels: Monitor machine data or process information.

🔹 Advantages for Makers & Engineers

• Large display area for clear, organized information.

• Widely supported by Arduino LiquidCrystal and compatible libraries.

• Easy to upgrade existing 16×2 LCD projects for more data visibility.

🔹 Safety & Precautions

• Use a current-limiting resistor for the backlight to avoid damage.

• Ensure correct wiring of RS, RW, and EN pins to prevent initialization issues.

• Handle with care to avoid flexing or cracking the glass.

🔗 Helpful Internal Links

• Pair with Electronics Components like sensors for data display.

• Use Tools and Accessories for soldering and installation.

• Browse Power Supply for reliable 5 V adapters.

🎥 Video Tutorial

[YouTube tutorial link here]

📝 Product Summary

The LCD 2004 20×4 Blue Backlight Module provides four full rows of clear alphanumeric display, making it ideal for Arduino, Raspberry Pi, IoT dashboards, and industrial control panels requiring large, easy-to-read data output.