Function: 16-pin IIC/I2C serial interface adapter module designed to simplify connections between Arduino or other microcontrollers and standard 16x2 or 20x4 LCD displays, reducing the number of required pins.

Compatibility: Fully compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and other boards supporting I2C communication; works with most HD44780-compatible LCD displays.

Construction: Built around the PCF8574 I/O expander IC with onboard potentiometer for contrast adjustment, power indicator LED, and pre-soldered male header pins for easy LCD attachment.

Motion Control: Provides smooth and reliable serial data transmission over the I2C bus, allowing text and data to be displayed efficiently using only two communication lines (SDA and SCL).

Applications: Ideal for projects requiring display output with limited I/O pins, such as embedded systems, IoT dashboards, digital meters, and educational electronics.

Assembly: Simple 4-pin connection (VCC, GND, SDA, SCL); easily stackable onto the back of an LCD display using standard headers and solder pads.

Compact Design: Lightweight, space-saving module that neatly integrates behind the LCD, offering clean wiring and reduced clutter in project enclosures.