PCF8574 I²C I/O Expander Module — LCD1602 / LCD2004 Serial Interface Adapter for Arduino

PCF8574 I²C I/O Expander Module — LCD1602 / LCD2004 Serial Interface Adapter

The PCF8574 I²C adapter module converts your standard parallel-interface LCD1602 or LCD2004 display into an I²C serial device, reducing the required GPIO pins from 6 to just 2 (SDA + SCL). This makes it ideal for Arduino, Raspberry Pi, and other microcontroller projects where GPIO pins are limited.

Key Specifications

Parameter	Value
IC	PCF8574 / PCF8574A
Interface	I²C (2-wire: SDA + SCL)
I²C Address	0x20–0x27 (A0–A2 jumper selectable)
Supply Voltage	5V DC
Compatible Displays	LCD1602, LCD2004 (HD44780 controller)
Backlight Control	Yes (jumper on/off)
Contrast Adjustment	Yes (onboard potentiometer)
Connector	4-pin (GND, VCC, SDA, SCL)

Why Choose This I²C Adapter?

• ✅ Saves 4 GPIO pins — only SDA and SCL needed vs. 6-pin parallel wiring
• ✅ Address selectable — up to 8 modules on the same I²C bus
• ✅ Backlight jumper — easily enable or disable LCD backlight
• ✅ Onboard contrast pot — no external trimmer required
• ✅ Arduino library support — works with LiquidCrystal_I2C library out of the box

Typical Applications

• Arduino LCD display projects with minimal GPIO usage
• Raspberry Pi I²C LCD interfacing
• Sensor data display on LCD1602 / LCD2004
• Menu-driven embedded UI systems
• IoT device status displays

Package Contents

• 1 × PCF8574 I²C LCD Adapter Module (pre-soldered to LCD or standalone)

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