I2C LCD Interface Module

I2C LCD Interface Module – Serial Adapter for 16×2 and 20×4 Character LCDs

The I2C LCD Interface Module is a compact adapter board that enables I2C communication with standard HD44780-based character LCDs (16×2, 20×4, etc.). It drastically reduces the number of pins required to control the LCD from a microcontroller, using only two data lines (SCL and SDA) instead of the usual 6–8 pins. Featuring a PCF8574 I/O expander, this module is ideal for Arduino, ESP32, STM32, and Raspberry Pi projects where GPIO pins are limited or optimization is required.

Product Specifications

Key Features

• Reduces Pin Usage
  Replaces parallel communication with serial I²C, using only two microcontroller pins.

• Plug-and-Play Compatibility
  Easily connects to LCDs using standard 16-pin headers.

• Onboard Contrast Control
  Built-in potentiometer allows quick visual tuning of display contrast.

• Adjustable I2C Address
  Address selection jumpers allow multiple displays on the same I2C bus.

• Backlight Control
  Enable or disable the LCD backlight through code or jumper settings.

Benefits

• Simplifies Wiring
  Significantly cuts down on jumper wires in breadboard or PCB designs.

• GPIO Optimization
  Frees up valuable I/O pins for other sensors, buttons, or peripherals.

• Arduino & ESP Compatible
  Supported by popular libraries like LiquidCrystal_I2C, making integration fast and easy.

• Ideal for Compact Projects
  Suitable for space-constrained or portable designs where pin count and wiring are critical.

Applications

• Microcontroller Display Systems
  Show sensor data, menu interfaces, and system status messages.

• IoT Devices and Dashboards
  Display real-time telemetry, alerts, and connectivity info.

• Robotics Interfaces
  Use in robot control panels or onboard display units.

• DIY Electronics Projects
  Integrate into smart gadgets, clocks, battery monitors, and more.

• Educational and STEM Kits
  Great for teaching embedded system displays and I²C protocol basics.