16×2 LCD Display with I2C Interface – Blue Backlight

Product Description

The 16×2 Blue LCD Display Module with I2C Interface is a practical character display designed for Arduino, Raspberry Pi, ESP32, STM32, and other microcontroller-based projects. It features a 16-character × 2-line display with a blue backlight and white text, providing clear visibility for displaying sensor readings, system status, menus, counters, and other information.

The integrated PCF8574 I2C backpack simplifies the connection by allowing the LCD to communicate with the microcontroller using only two communication lines: SDA and SCL. This helps save valuable GPIO pins for other components such as sensors, motors, relays, and actuators.

The onboard potentiometer allows manual adjustment of the display contrast, while the backlight jumper provides convenient control over the LCD backlight. With its simple wiring and broad compatibility, this module is an excellent choice for beginners, hobbyists, students, and embedded-system developers.

Features

• 16 characters × 2 lines LCD display
• Blue backlight with white text
• Integrated PCF8574 I2C backpack
• I2C/IIC serial communication
• Uses only SDA and SCL for communication
• Helps save microcontroller GPIO pins
• Built-in contrast adjustment potentiometer
• Backlight control jumper
• 5V DC operating voltage
• Compatible with Arduino
• Compatible with Raspberry Pi
• Compatible with ESP32 and STM32
• Easy to wire and integrate
• Suitable for real-time data display
• Ideal for beginner and advanced electronics projects

Specifications

Interface Pinout

Design and Construction

The module combines a standard 16×2 character LCD with a rear-mounted PCF8574 I2C interface backpack. This integrated design significantly reduces the number of wires required compared with a conventional parallel LCD connection.

An onboard potentiometer is provided for adjusting display contrast according to viewing conditions. A jumper is also included for controlling the LCD backlight. The module is designed for straightforward connection to compatible development boards and microcontrollers.

Working Principle

The LCD receives commands and character data from the microcontroller through the I2C/IIC interface. The PCF8574 backpack converts the serial I2C communication into the parallel signals required by the LCD.

The SDA line transfers data, while the SCL line provides the communication clock. Once the data is received, the LCD displays the corresponding characters on its two rows.

The I2C interface typically uses an address such as 0x27 or 0x3F, although the actual address may vary depending on the backpack version. An I2C scanner can be used to determine the address if required.

Contrast Adjustment

If the display shows only dark blocks or the characters are not clearly visible, adjust the onboard contrast potentiometer slowly using a small screwdriver.

Turn the potentiometer gradually until the displayed characters become clearly visible.

Applications

• Arduino projects
• Raspberry Pi projects
• ESP32 projects
• STM32 projects
• Temperature and humidity displays
• Data logging systems
• Digital clocks and timers
• Sensor monitoring
• DIY control panels
• Menu-based interfaces
• 3D printer interfaces
• Robotics projects
• IoT devices
• Automation systems
• Embedded systems
• Status monitoring
• Educational electronics projects

Advantages

• Saves GPIO pins
• Simple 4-pin connection
• Clear blue backlight
• White character display
• Built-in contrast adjustment
• Integrated I2C backpack
• Easy microcontroller integration
• Suitable for multiple development platforms
• Useful for displaying real-time information

Package Includes

• 1 × 16×2 LCD Display Module with Blue Backlight
• 1 × Soldered I2C Interface Backpack

Product Disclaimer

Product images are for representation purposes only. The actual product may vary slightly in appearance, PCB layout, component placement, backlight intensity, or other physical details depending on the manufacturing batch.

The I2C address may vary between modules. Common addresses include 0x27 and 0x3F. Please verify the actual address using an I2C scanner if the display does not respond.

For proper operation, ensure that the module is supplied with the appropriate voltage and that the SDA and SCL connections are correctly wired.