PCF8574 16 Pin I2C LCD Display Module

Overview: I2C Module for LCD

The I2C module for LCD is a compact adapter that converts standard 16×2 and 20×4 character LCDs to the I2C bus. By using the I2C LCD module you replace bulky parallel wiring with just four connections (VCC, GND, SDA, SCL), making setup faster and cleaner for Arduino, Raspberry Pi, ESP32 and other microcontrollers.

Key Features

• 2-wire I2C interface saves up to 6 GPIO pins
• PCF8574 I/O expander for reliable I2C communication
• Backlight control via software
• Onboard potentiometer for contrast adjustment
• Compact design that mounts behind the LCD
• Plug-and-play installation with jumper wires
• Compatible with 16×2 and 20×4 character LCDs

Technical Specifications

• Operating Voltage: 2.5V to 6V
• Communication: I2C (SDA & SCL)
• Chip: PCF8574 I/O Expander
• Adjustable contrast via potentiometer
• Backlight: controllable by code
• Pins: VCC, GND, SDA, SCL
• Default I2C Address: 0x27 (configurable)

Benefits of Using an I2C LCD Module

• Clean wiring: no tangle of jumper wires
• Saves pins: ideal when using multiple sensors or modules
• Simple coding: use ready-made I2C LCD libraries
• Quick setup: no soldering required for many builds
• Universal compatibility: works with all major development boards
• Lightweight and durable: suitable for prototyping and lab rigs

Compatibility

This LCD I2C adapter board works with:

• Arduino (Uno, Mega, Nano, etc.)
• Raspberry Pi (all models with I2C support)
• ESP32 and other microcontrollers with I2C
• 16×2 and 20×4 HD44780-compatible character LCDs

How to Connect I2C LCD Module with Arduino

1. Attach the I2C module to the LCD header pins (fits behind the LCD)
2. Connect VCC to 5V and GND to ground
3. Connect SDA to A4 and SCL to A5 on an Arduino Uno (pins vary by board)
4. Install and use the LiquidCrystal_I2C library in the Arduino IDE
5. Set the correct I2C address (default 0x27) and upload your sketch

You can use the module to display sensor readings, menus, counters and live feedback in your projects.

Using with Raspberry Pi

• Enable I2C in Raspberry Pi configuration
• Connect SDA to SDA and SCL to SCL on the Pi header
• Use Python libraries such as smbus or dedicated LCD libraries for easy control

Ideal Applications

• DIY electronics and display systems
• Sensor monitoring and telemetry displays
• School robotics and coding kits
• Smart home interfaces and small control panels
• Projects with limited GPIO availability

Buy I2C LCD Module in Islamabad

If you need a reliable I2C module for LCD in Islamabad, Colgroad.com offers original, tested modules at competitive prices. Suitable for labs, classrooms and hobbyists, we provide secure packaging, delivery across Pakistan and product support.

Note

Images are for illustration purposes only.