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I2C Module for 16×2 (1602) Character LCD

Specification	Details
Compatible LCDs	16x2 (1602) and 20x4 (2004)
Input Voltage	5V DC
Interface	I2C (SDA, SCL)
Default Address	0x27 or 0x3F (PCF8574 chip)
Contrast Adjust	Onboard Blue Potentiometer
Backlight Control	Jumper-based or Software-controlled
Dimensions	41.5mm x 19mm

Price

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₹ 57.14

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Barcode: 3781207

Product Description

The I2C LCD Adapter is built around the PCF8574 remote 8-bit I/O expander chip. It is designed to be soldered directly onto the back of a standard character LCD. Once installed, it communicates with your microcontroller via the I2C protocol, significantly reducing wiring complexity and potential connection errors. The module includes an onboard potentiometer to fine-tune the display contrast and a jumper that can be removed to turn off the backlight manually, or it can be toggled via code.

Key Features

Pin Efficiency: Reduces the required pins from 6+ down to just 2 (SDA and SCL).
Address Jumpers: Features three solder pads (A0, A1, A2) that allow you to change the I2C address, enabling up to 8 LCDs on a single bus.
Integrated Contrast Control: The blue multi-turn trimmer allows for precise adjustment of character visibility.
Flexible Backlight: The black jumper allows for easy manual control, while the I2C library enables software-based dimming/toggling.
Standard 2.54mm Pitch: Perfectly aligns with the 16 pins of standard character LCD modules for easy soldering.

Technical Details

I2C Address Range: 0x20 to 0x27 (for PCF8574) or 0x38 to 0x3F (for PCF8574A).
Support: Compatible with the LiquidCrystal_I2C library for Arduino.
Weight: ~5g.

Prototyping and Engineering Tips from Robogears

Scanning for the Address: If your code isn't working, the most common issue is a wrong I2C address. Run an "I2C Scanner" sketch on your Arduino to find the exact hex address (usually 0x27 or 0x3F) of your specific module.
The "Invisible Text" Fix: If the screen lights up but shows no characters, use a small screwdriver to turn the blue potentiometer. Often, the contrast is set to minimum from the factory, making the text invisible until adjusted.
Soldering Orientation: When attaching the module to the LCD, ensure the I2C pins face away from the screen. Soldering it "backwards" is a common mistake that can lead to short circuits or blocked viewable areas.
Pull-up Resistors: The I2C bus requires pull-up resistors to function. Most of these modules already have 4.7kΩ resistors onboard, so you usually don't need to add external ones when connecting to an Arduino.

Package Includes

1 x I2C Module for 16x2 / 1602 / 20x4 Character LCD

Disclaimer

Requires soldering for permanent installation. Ensure your power supply is a stable 5V, as low voltage can cause the I2C communication to fail or the display to become dim.

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