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PCF8574 I2C LCD Adapter Module for LCD1602 LCD2004 Arduino (5-Pack)
PCF8574 I2C LCD Adapter Module for LCD1602 LCD2004 Arduino (5-Pack)
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PCF8574 I2C LCD Adapter Module — LCD1602 / LCD2004 Compatible
The PCF8574 I2C LCD Adapter converts standard parallel LCD displays (HD44780-based LCD1602 and LCD2004) to I2C interface, reducing the required GPIO pins from 6–8 pins down to just 2 (SDA + SCL). Essential for Arduino and Raspberry Pi projects where GPIO pins are scarce.
Key Specifications
| Parameter | Value |
|---|---|
| IC | PCF8574 / PCF8574T |
| Interface | I2C (TWI) |
| Default I2C Address | 0x27 (PCF8574T) / 0x3F (PCF8574AT) |
| Address Pins | A0, A1, A2 (solder jumpers, 8 addresses) |
| Supply Voltage | 5V DC |
| Compatible Displays | LCD1602, LCD2004 (HD44780 controller) |
| Backlight Control | Jumper-selectable ON/OFF |
| Contrast Adjustment | Onboard potentiometer |
| Quantity | 5 pieces |
Why Choose This I2C Adapter?
- Save GPIO Pins — Only SDA + SCL needed vs. 6–8 pins for parallel LCD
- Adjustable I2C Address — Up to 8 devices on one I2C bus via A0/A1/A2 jumpers
- Onboard Contrast Pot — Easy display contrast adjustment without external components
- Backlight Jumper — Enable/disable LCD backlight to save power
- Plug-and-Play — Direct solder onto LCD1602/LCD2004 16-pin header
Typical Applications
- Arduino Uno/Nano/Mega LCD display projects with limited pins
- Raspberry Pi I2C LCD status displays
- ESP8266/ESP32 IoT device readouts
- Sensor data display (temperature, humidity, distance)
- Menu-driven embedded UI with minimal wiring
Arduino Library
Use LiquidCrystal_I2C library by Frank de Brabander. Initialize with: LiquidCrystal_I2C lcd(0x27, 16, 2); for LCD1602 or LiquidCrystal_I2C lcd(0x27, 20, 4); for LCD2004.
FAQ
Q: My LCD shows blocks but no text — what’s wrong?
A: Adjust the contrast potentiometer on the adapter. Also verify the I2C address with an I2C scanner sketch.
Q: Can I use two LCD displays on the same Arduino?
A: Yes — solder A0/A1/A2 jumpers differently on each adapter to assign unique I2C addresses (0x20–0x27).
Package Contents
- 5× PCF8574 I2C LCD Adapter Module
