PCF8574 I2C 16 Pin LCD Display Adapter Module

The PCF8574 I2C 16 Pin LCD Display Adapter Module is designed to simplify the connection of a 16×2 LCD display by converting the parallel interface into an I2C interface. It reduces the number of required GPIO pins from many to just two (SDA and SCL), making it ideal for microcontrollers like Arduino, ESP32, ESP8266, and Raspberry Pi. This module is commonly used to interface HD44780-compatible LCDs with minimal wiring.

Features:

• I2C Interface: Uses only 2 wires (SDA and SCL) for communication
• Compatible with 16×2 LCD: Works with HD44780-based LCD displays
• PCF8574 I/O Expander: Converts I2C signals into parallel LCD control signals
• Reduces Pin Usage: Saves microcontroller GPIO pins
• Adjustable Contrast: Onboard potentiometer for contrast control
• Backlight Control: Supports LCD backlight switching
• Easy Integration: Plug-and-play with standard LCD modules
• Address Configurable: I2C address can be changed using solder jumpers
• Widely Supported Libraries: Compatible with Arduino LiquidCrystal_I2C library

Specifications:

• IC: PCF8574 I/O Expander
• Interface: I2C (SDA, SCL)
• Operating Voltage: 5V DC
• Default I2C Address: Commonly 0x27 or 0x3F (configurable)
• Compatibility: 16×2 and 20×4 LCD modules (HD44780 compatible)
• Contrast Adjustment: Built-in potentiometer
• Backlight Control: Yes (jumper or code controlled depending on module)
• Communication Speed: Standard I2C speed supported by microcontrollers
• Pins: VCC, GND, SDA, SCL