16×2 LCD Display with I2C Interface – Yellow-Green Backlight

16×2 LCD Display with I2C Interface – Yellow-Green Backlight

Product Description

The 16×2 LCD Display with I2C Interface is a compact character display designed for Arduino, ESP32, Raspberry Pi, embedded systems, industrial controls, and DIY electronics projects. It features a classic yellow-green backlight with black characters for clear and easy-to-read information.

The display includes a pre-soldered PCF8574 I2C backpack, reducing the required wiring to VCC, GND, SDA, and SCL. This makes it easier to connect the LCD while saving valuable GPIO pins on the microcontroller.

Easy I2C Interface

The built-in I2C interface simplifies LCD communication compared with traditional parallel wiring. Multiple I2C devices can share the same bus, making the module suitable for projects that require sensors, displays, and other peripherals simultaneously.

The commonly used I2C addresses are 0x27 or 0x3F, depending on the backpack version.

High Visibility Display

The LCD provides 16 characters across 2 lines with black text on a bright yellow-green background. The high-contrast display is suitable for indoor projects, instrumentation, status indicators, and outdoor applications where clear text visibility is required.

Adjustable Contrast

A built-in contrast potentiometer on the I2C backpack allows the display contrast to be adjusted. This helps optimize character visibility under different lighting and viewing conditions.

Key Features

• 16×2 character LCD display
• Yellow-green backlight with black text
• Pre-soldered PCF8574 I2C interface
• Simplified 4-pin connection
• Supports SDA and SCL communication
• Saves microcontroller GPIO pins
• Adjustable contrast potentiometer
• 5V DC operation
• Compatible with Arduino and other microcontrollers
• Suitable for sensors, status displays, and control systems

Technical Specifications

Feature	Specification
Display Type	16×2 Character LCD
Backlight Color	Yellow-Green
Text Color	Black
Interface	I2C / IIC
Controller	PCF8574
Operating Voltage	5V DC
Common I2C Address	0x27 or 0x3F
Pins	GND, VCC, SDA, SCL
Contrast Control	Onboard Potentiometer

Working Principle

The LCD displays text and characters according to data received through the I2C communication interface. The PCF8574 backpack converts the serial I2C signals from the controller into the parallel signals required by the LCD.

This allows the display to be controlled using only the SDA and SCL communication lines, along with power and ground.

Connection Interface

The module provides four main connections:

• GND: Ground
• VCC: 5V Power
• SDA: I2C Data
• SCL: I2C Clock

Typical Application Scenarios

Industrial Control

Suitable for displaying machine status, operating values, counters, and system messages.

Weather Stations

Can display temperature, humidity, pressure, and other environmental readings.

Educational Projects

Useful for learning LCD interfacing and I2C communication with Arduino and other development boards.

Sensor Displays

Ideal for displaying real-time sensor values, measurement results, and system status information.

Applications

• Arduino projects
• ESP32 projects
• Raspberry Pi projects
• Industrial displays
• Weather stations
• Sensor monitoring
• Embedded systems
• Automation projects
• Robotics
• Data logging systems
• DIY electronics
• Educational projects
• Machine status displays

Package Includes

• 1 × 16×2 LCD Display Module with Yellow-Green Backlight
• 1 × Pre-Soldered I2C Interface / PCF8574 Backpack

Product Disclaimer

Product information provided on our website may vary between manufacturers and production batches. Please verify the actual module specifications before integrating it into a critical application.

Product images are for illustrative purposes only and may differ from the actual product in colour, component placement, or other visual details.

Important Note

I2C Address

The common I2C addresses are 0x27 and 0x3F, but the actual address may vary depending on the installed PCF8574 backpack. An I2C scanner can be used to identify the correct address.

Contrast Adjustment

If the display shows only dark blocks or the characters are not visible, gently adjust the onboard contrast potentiometer until the text becomes clear.

Voltage

The specified operating voltage is 5V DC. Ensure the supply and connected controller are compatible with the module.

Recommended Related Products

Explore relevant alternatives and complementary products selected from the full TechyTron catalogue.

• 1602 16X2 LCD display Character Display with Green Backlight
• 1602 16X2 LCD display Character Display with Blue Backlight
• 2004 20X4 Character LCD display Module with Green Backlight
• 0.96 Inch 4Pin White IIC I2C OLED Display Module For Arduino
• 0.96 Inch 4Pin Blue IIC I2C OLED Display Module For Arduino
• 2004 20X4 Character LCD display Module with Blue Backlight