Description
The PCF8574 I2C Adapter Board with 2004A 20×4 Alphanumeric LCD Display is a reliable and easy-to-use character LCD module for displaying text, numbers, symbols, sensor readings, and other information in electronics projects. With 20 characters per line and 4 lines, the display can show up to 80 characters at a time.
The LCD features a clear blue backlight that provides good visibility and gives your project a professional appearance. It uses an HD44780-compatible controller, making it widely supported by Arduino libraries and compatible with many microcontrollers and development boards.
The included pre-soldered PCF8574 I2C adapter board simplifies the connection by allowing the LCD to communicate through the I2C interface. This significantly reduces the number of GPIO pins required compared with traditional parallel LCD connections.
Key Features
- 20×4 character LCD display with 20 characters on each of 4 lines
- Bright blue LED backlight for improved visibility
- Includes a pre-soldered PCF8574 I2C adapter
- Supports convenient I2C communication
- Compatible with Arduino, Raspberry Pi, PIC, ATmega and other microcontrollers
- Supports 4-bit and 8-bit parallel data modes
- Displays letters, numbers, symbols, and custom characters
- 5×7 dot matrix character display with cursor
- Low power consumption
- Easy to integrate into DIY and embedded electronics projects
LCD 2004A 20×4 Specifications
| Specification | Details |
|---|---|
| Display Format | 20 Characters × 4 Lines |
| LCD Type | STN Blue |
| Backlight | Blue |
| Character Matrix | 5 × 8 Dots |
| Character Size | Approx. 2.95 × 4.75 mm |
| Character Pitch | Approx. 3.55 × 5.35 mm |
| Controller | HD44780 Compatible / Equivalent |
| Interface | 4-bit & 8-bit Parallel |
| Adapter | PCF8574 I2C Adapter Board |
| Operating Voltage | 5V DC |
| Driving Method | 1/16 Duty |
| Module Dimensions | Approx. 98 × 60 × 13.6 mm |
| Viewing Area | Approx. 77 × 25.2 mm |
| Dot Size | Approx. 0.55 × 0.55 mm |
| Dot Pitch | Approx. 0.6 × 0.6 mm |
| Operating Temperature | -20°C to 70°C |
PCF8574 I2C Adapter
The PCF8574 I2C adapter board is already attached to the LCD, allowing you to control the display through the I2C communication interface. Instead of using many Arduino or microcontroller GPIO pins for the LCD’s parallel interface, the I2C adapter reduces the connection to a simple SDA and SCL interface along with power and ground.
This makes the module especially useful when you need to connect additional sensors, buttons, relays, or other modules while keeping your microcontroller’s GPIO pins available.
Applications
The 20×4 I2C LCD Display Module is suitable for a wide range of electronics and embedded projects, including:
- Arduino projects
- Raspberry Pi projects
- DIY digital displays
- Temperature and humidity monitoring
- Sensor data display
- Industrial control panels
- Robotics projects
- Home automation systems
- Electronic measuring instruments
- IoT projects
- Educational and student projects
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