LCD2004 Blue LCD Display with I2C Module

This LCD display shows 4 lines of 20 characters each in white text on a blue background. The I2C module with the PCF8574 port expander is already soldered onto the back, so 4 connections are enough: SDA, SCL, 5 V and GND. The display is driven by the HD44780 controller. The I2C address depends on the marking on the chip of the module.

Recommended Accessories:

• Dupont Jumper Cable Set 30cm M/F 40 pcs.
• Logic Level Converter 2-Channel 5V / 3.3V

Features:

• 20 × 4 characters, white text, blue backlight
• HD44780 controller, I2C via the PCF8574 port expander
• Marking PCF8574T: 0x20 to 0x27, default 0x27
• Marking PCF8574AT: 0x38 to 0x3F, default 0x3F
• I2C address adjustable via solder jumpers A0, A1 and A2
• Contrast adjustable via the blue potentiometer on the module
• Backlight can be switched on and off via I2C, fully disabled by removing the «LED» jumper
• Ready-made Arduino library in the Library Manager under «LiquidCrystal_I2C»
• Operation with 5 V; for 3.3 V boards such as ESP32, a level shifter for SDA and SCL is suitable

Application Examples:

• Display of measured values, time and menus with Arduino, ESP32 or Raspberry Pi
• Projects with few free I/O pins
• Integration into Home Assistant with ESPHome

Documentation:

• ESPHome documentation: Character-Based LCD Display
• Tutorial I2C LCD with Arduino and I2C scanner (Last Minute Engineers)
• LiquidCrystal_I2C library (GitHub)

Technical Data:

• Operating voltage: 5 V
• Characters: 20 × 4
• Backlight: blue
• Text colour: white
• LCD controller: HD44780
• I2C chip: PCF8574T or PCF8574AT, see marking
• Connections: GND, VCC, SDA, SCL
• Viewing area: 75 × 27 mm
• Dimensions with module: 100 × 60 × 20 mm
• Weight: 81 g

Scope of Delivery:

• 1× LCD2004 Blue LCD Display with I2C Module