LCD2004 20×4 Character LCD Display — Blue Backlight, Parallel Interface

LCD2004 20×4 Character LCD Display — Blue Backlight, Parallel Interface

The LCD2004 20×4 character LCD display with HD44780 controller and blue backlight — the larger alternative to the LCD1602, providing 20 characters across 4 lines for displaying more data simultaneously. Compatible with the Arduino LiquidCrystal library using the same code as the LCD1602. Add an I2C backpack (PCF8574) to reduce wiring to 2 wires.

Key Specifications

• Display: 20 characters × 4 lines | Controller: HD44780
• Interface: 4-bit or 8-bit parallel | Pins: 16-pin header
• Supply: 5V | Backlight: Blue with white characters
• Contrast: Adjustable via pin 3 (V0)
• Library: LiquidCrystal (Arduino built-in)
• Compliance: RoHS compliant

LCD2004 vs LCD1602

• LCD2004: 20×4 = 80 characters — display 4 sensor readings simultaneously
• LCD1602: 16×2 = 32 characters — compact, sufficient for simple displays
• Both use the same HD44780 controller and LiquidCrystal library code

Typical Applications

• Multi-sensor data display (temperature, humidity, pressure, time)
• Arduino menu system with 4-line navigation
• Data logger status display
• Industrial controller status panel
• Clock with date, time, and additional information

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