The I2C LCD Driver Module is the ultimate time-saver for anyone tired of messy wiring. At Electrapac, we recommend this module to transform your standard 1602 or 2004 LCD from a complex 16-pin nightmare into a simple, 4-pin "plug-and-play" interface.

Product Overview

This module is based on the PCF8574 I/O expander chip. It acts as a bridge between your microcontroller and the LCD, converting the I2C serial data from your Arduino or ESP32 into the parallel signals required by the display. By using this, you save up to 12 digital pins on your controller for other sensors and actuators.

Key Features for Electrapac Customers

• Dramatic Wiring Reduction: Reduces the connection requirement to just 4 pins: VCC, GND, SDA (Data), and SCL (Clock).

• Adjustable Contrast: No need for an external breadboard and separate potentiometer. Use the integrated blue trimmer to make your text perfectly sharp.

• Backlight Control: Includes a jumper cap that allows you to turn the backlight on or off manually. You can also control the backlight through your code to save power.

• Addressable Setup: Features three solder pads (A0, A1, A2) that allow you to change the I2C address. This means you can run up to 8 LCDs on the same two wires!

• Universal Compatibility: Works seamlessly with Arduino, Raspberry Pi, ESP8266, ESP32, and STM32.

Wiring & Connection Guide

[Image showing I2C module soldered to the back of an LCD and connected to an Arduino Uno]

To get your display running from www.electrapac.com, follow this pin mapping:

1. GND: Connect to Arduino Ground.

2. VCC: Connect to Arduino 5V.

3. SDA: Connect to Arduino Pin A4 (on Uno) or SDA pin.

4. SCL: Connect to Arduino Pin A5 (on Uno) or SCL pin.

Pro-Tip: If you see "Blocks" instead of text after uploading your code, simply use a screwdriver to turn the blue potentiometer on the back of the I2C module until the letters appear.

Primary Applications

• Space-Constrained Projects: Perfect for small enclosures where a 16-wire ribbon cable won't fit.

• Complex Robotics: When you've used up most of your Arduino pins for motors and servos, I2C gives you back the pins you need.

• IoT Dashboards: Easily display Wi-Fi status or IP addresses for ESP32/ESP8266 projects.

• Industrial Displays: Long-distance data display (over a few feet) using the stable I2C protocol.

Why Shop at Electrapac?

We source I2C Driver Modules with high-quality soldering pads to make it easy for you to attach them to your displays. Visit us at www.electrapac.com to find this module, 1602/2004 LCDs, and female-to-female jumper wires.