The LCD with I2C Interface is a character display module (commonly 16×2 or 20×4) that uses an I2C backpack (PCF8574) to drastically reduce wiring. Instead of many parallel pins, it needs only two wires (SDA & SCL), making it perfect for clean builds, quick prototyping, and STEM education projects with Arduino, ESP32, and other microcontrollers.

Key Features

• Display Sizes: 16×2 or 20×4 (varies by option)

• Interface: I2C (PCF8574 backpack)

• Operating Voltage: 5V DC (3.3V logic via I2C supported on many boards)

• Wiring: Only 4 pins (VCC, GND, SDA, SCL)

• Adjustable Contrast: Onboard potentiometer

• Backlight Control: Via jumper / software

• Clear, High-Contrast Characters

Applications

• Sensor data display (temperature, humidity, voltage)

• Menus and status screens

• Robotics dashboards

• Clocks, timers, counters

• IoT prototypes and STEM kits

Compatibility

• Arduino Uno / Nano / Mega

• ESP32 / ESP8266

• Raspberry Pi (I2C enabled)

• Other I2C-capable microcontrollers