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I2C Interface Module for LCD Display (PCF8574 Backpack)
Compact I2C interface module for converting standard LCD displays (16×2 / 20×4) to I2C, reducing wiring and saving GPIO pins.
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Description
The I2C Interface Module (also known as LCD I2C Backpack) allows standard 16×2 and 20×4 character LCD displays to communicate using the I2C protocol. This significantly reduces the number of required pins—from 6–8 pins down to just 2 wires (SDA & SCL).
Based on the PCF8574 I/O expander, this module is widely used with Arduino, ESP8266, ESP32, and Raspberry Pi. It features an onboard potentiometer for contrast adjustment and supports easy plug-and-play operation.
| Parameter | Value |
|---|---|
| Module Type | I2C LCD Interface |
| Controller IC | PCF8574 |
| Operating Voltage | 5V DC |
| Communication | I2C |
| I2C Address | 0x27 / 0x3F (varies) |
| Compatible LCDs | 16×2, 20×4 |
| Interface Pins | SDA, SCL |
| Contrast Control | Onboard Potentiometer |
Additional information
| Weight | 8 g |
|---|---|
| Dimensions | 42 × 19 × 14 mm |
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