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Detailed Description:

Simplify your electronics projects and save valuable microcontroller pins with the I2C LCD Interface Module, also known as the IIC Serial Interface Adapter Module. This clever little board is a game-changer for anyone looking to connect a standard 16x2 or 20x4 character LCD to an Arduino, ESP32, or other microcontroller. By converting the LCD's traditional parallel communication into the two-wire I2C (Inter-Integrated Circuit) protocol, this module drastically reduces the number of connections required from a cumbersome 8-12 pins down to just four (VCC, GND, SDA, and SCL).

At the core of the module is the popular PCF8574 I/O expander chip, which handles all the data conversion seamlessly. This not only makes wiring cleaner and easier but also frees up a significant number of your microcontroller's GPIO pins for other sensors, buttons, and components. The module also features an on-board potentiometer that allows you to effortlessly adjust the display contrast for optimal viewing in any lighting condition. Additionally, a jumper is typically included to easily enable or disable the backlight.

With a default I2C address (commonly 0x27), the module is compatible with a vast number of available Arduino libraries, making the coding process straightforward and intuitive. Whether you are building a data logger, a home automation interface, a security system, or an educational project, this I2C LCD interface module is an indispensable tool. Its ease of use, compact design, and ability to streamline your circuit make it a must-have component for any maker in Pune, Maharashtra, India, and beyond who wants to get a project up and running quickly and efficiently.

This I2C Interface Module simplifies the connection between a microcontroller and a 16x2 or 20x4 character LCD by reducing the required wires from 16 to just 4 (VCC, GND, SDA, SCL). It uses the PCF8574 I/O expander chip to convert I2C signals to parallel ones used by the LCD.

The onboard blue potentiometer allows you to adjust backlight brightness and contrast, and the module includes an on/off jumper for backlight control.

It’s perfect for DIY electronics, IoT displays, and data logging dashboards where space and pin count matter.

Key Features:

• Converts parallel LCD to I2C-controlled

• Reduces LCD pin usage from 16 to just 2 control lines (SDA, SCL)

• Compatible with 16x2 and 20x4 character LCDs

• Based on PCF8574 I2C I/O Expander Chip

• Onboard contrast potentiometer and backlight jumper

• Adjustable I2C address via solder jumpers

• Plug-and-play with Arduino LiquidCrystal_I2C library

• Compact design, fits behind standard LCDs

Technical Specifications:

How to Use:

1. Solder the module onto the 16x2 or 20x4 LCD.

2. Connect VCC, GND, SDA, and SCL to your microcontroller.

3. Install LiquidCrystal_I2C library in Arduino IDE.

4. Use the address 0x27 or scan using I2C scanner code.

5. Adjust contrast via the onboard potentiometer.

Example Arduino Code and Wiring Diagram available upon request.

Applications:

• Arduino projects with LCD display

• IoT dashboards and readouts

• Weather stations & data loggers

• Sensor-based embedded projects

• Raspberry Pi GPIO-saving displays

• STEM kits and training modules

Package Includes:

• 1 x I2C LCD Interface Module (PCF8574 Based)

• (LCD display not included – sold separately)