LCD2004 GREEN DISPLAY
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The LCD2004 is a popular type of character Liquid Crystal Display (LCD) module commonly used with microcontrollers like Arduino and Raspberry Pi for displaying information.
Key Features and Specifications
The "2004" designation refers to its display capacity:
20 Characters per line.
4 Lines of text.
| Characteristic | Typical Specification |
| Display Format | 20 characters $\times$ 4 lines |
| Controller | Hitachi HD44780 or equivalent (like ST7066) |
| Operating Voltage | Typically 5V DC |
| Backlight | LED (commonly Blue with White text, or Yellow-Green with Black text) |
| Contrast | Adjustable via an onboard potentiometer (if on a module) |
| Pin Count | 16 pins for the raw display; often mounted on an I2C/IIC adapter board with only 4 pins (VCC, GND, SDA, SCL) for simplified wiring. |
Common Configurations
Parallel Interface (16-Pin): This is the raw display which uses a large number of digital I/O pins (typically 6 or more) on the microcontroller for communication.
I2C/IIC Interface (4-Pin): This is the most common configuration for hobbyists. The display is mounted on a small adapter board (often using a PCF8574 I/O expander chip). This reduces the required connections to only two data pins (SDA and SCL) plus power and ground, saving valuable I/O pins on the main board. The communication is then handled via the I2C serial protocol.
Applications
The LCD2004 is widely used for displaying status information and simple user interfaces in a variety of electronic projects, including:
Embedded Systems: Status monitoring and diagnostics.
Microcontroller Projects: Displaying sensor data (temperature, humidity, etc.).
Instrumentation Panels: Showing measurements in testing equipment.
Clocks and Timers: Displaying time and count values.