I2C Interface Module for 16x2 & 20x4 LCD Displays – PCF8574 Based
Simplify Your LCD Projects with I2C Interface
The I2C LCD Interface Module is a compact board that enables 16x2 or 20x4 character LCD displays to be controlled using only two wires—SDA and SCL—via the I2C protocol. Built around the PCF8574 I/O expander, this module significantly reduces the number of pins needed to control an LCD from 16 to just 4 (VCC, GND, SDA, SCL).
It features an adjustable contrast potentiometer and a jumper to enable or disable the backlight. Ideal for Arduino, ESP8266, ESP32, Raspberry Pi, and other microcontroller projects where GPIO pins are limited.
Perfect for students, hobbyists, and developers looking to simplify display integration in their embedded systems.
Specifications:
Chipset: PCF8574 I/O Expander
Interface Type: I2C (SDA & SCL)
Operating Voltage: 5V DC
Compatible Displays: 16x2, 20x4 LCD (HD44780 based)
Address: Configurable via jumpers (default: 0x27 or 0x3F)
Backlight Control: On/Off jumper
Contrast Adjustment: Via onboard potentiometer
Dimensions: Approx. 43mm x 20mm
Pins Required: VCC, GND, SDA, SCL