LCD 16x2 Blue Backlight With I2C Module
This module combines a 16x2 character LCD with a blue backlight and an I2C interface for simplified connectivity. The display uses the PCF8574 I2C interface board, allowing easy integration with microcontrollers like Arduino using only two wires (SDA and SCL). The built-in potentiometer adjusts the contrast and brightness for optimal viewing.;
Package Includes:
- 1 x LCD 16x2 Blue Backlight With I2C Module
Features:
- LCD Display:
- 16 characters × 2 lines
- White text on a blue backlight for improved visibility
- 5V supply voltage
- Compact size: 98 x 60 x 12mm
- I2C Interface Module:
- Supply voltage: 5V
- Potentiometer for adjusting backlight and contrast
- 2 I2C interfaces – connect via Dupont lines or I2C cables
- Compatible with 1602 and 2004 LCDs
Principle of Work:
The LCD operates by manipulating the polarization of light through a liquid crystal layer using an electric field. The I2C module enables serial communication with microcontrollers using just two lines: SDA (data) and SCL (clock). Address pins (A0–A2) allow multiple displays on a single bus.
Pinout:
- VCC: Power supply (5V)
- GND: Ground
- SDA: Serial Data Line
- SCL: Serial Clock Line
- A0, A1, A2: I2C address selection pins
- Potentiometer: Adjusts contrast and backlight
Applications:
- Embedded systems (IoT, home automation, wearables)
- Robotics (status/sensor display)
- Consumer electronics (MP3 players, cameras, consoles)
- Instrumentation and control systems
- Educational development and prototyping
Circuit Diagram:
Connection to Arduino Uno:
- VCC → 5V
- GND → GND
- SDA → A4
- SCL → A5
Library Installation:
- Open Arduino IDE
- Go to Sketch > Include Library > Manage Libraries
- Search for
LiquidCrystal_I2C - Click "Install"
- Include the library in your sketch
Example Code:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Hello, world!");
}
void loop() {
if (Serial.available() > 0) {
String input = Serial.readString();
lcd.clear();
lcd.print(input);
}
}
Technical Details:
- Display:
- 16 characters x 2 rows
- Blue backlight with white characters
- Character size: 2.95mm x 4.35mm
- Character pixels: 5x7
- Voltage: 5V ± 0.5V
- Current: ~2mA @ 5V
- Dimensions: 80 x 36 x 13 mm
- Temperature range: 0°C to 55°C
- I2C PCF8574 Module:
- Voltage: 5V
- I2C address configurable via A0–A2
- Compatible with 1602/2004 displays
- Adjustable contrast and brightness
- 2 I2C interfaces (Dupont or dedicated cable)
- Operating temp: 0°C to 55°C
Comparison with Non-I2C LCD:
A standard 16x2 LCD without I2C requires many digital pins (typically 6–10) for operation. The I2C version reduces this to just 2 pins (SDA and SCL), simplifying wiring and freeing up valuable microcontroller I/O. It's more compact, easier to use, and scalable for larger projects.
Features:
- LCD Display:
- 16 characters × 2 lines
- White text on a blue backlight for improved visibility
- 5V supply voltage
- Compact size: 98 x 60 x 12mm
- I2C Interface Module:
- Supply voltage: 5V
- Potentiometer for adjusting backlight and contrast
- 2 I2C interfaces – connect via Dupont lines or I2C cables
- Compatible with 1602 and 2004 LCDs
Principle of Work:
The LCD operates by manipulating the polarization of light through a liquid crystal layer using an electric field. The I2C module enables serial communication with microcontrollers using just two lines: SDA (data) and SCL (clock). Address pins (A0–A2) allow multiple displays on a single bus.
Pinout:
- VCC: Power supply (5V)
- GND: Ground
- SDA: Serial Data Line
- SCL: Serial Clock Line
- A0, A1, A2: I2C address selection pins
- Potentiometer: Adjusts contrast and backlight
Applications:
- Embedded systems (IoT, home automation, wearables)
- Robotics (status/sensor display)
- Consumer electronics (MP3 players, cameras, consoles)
- Instrumentation and control systems
- Educational development and prototyping
Circuit Diagram:
Connection to Arduino Uno:
- VCC → 5V
- GND → GND
- SDA → A4
- SCL → A5
Library Installation:
- Open Arduino IDE
- Go to Sketch > Include Library > Manage Libraries
- Search for
LiquidCrystal_I2C - Click "Install"
- Include the library in your sketch
Example Code:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Hello, world!");
}
void loop() {
if (Serial.available() > 0) {
String input = Serial.readString();
lcd.clear();
lcd.print(input);
}
}
Technical Details:
- Display:
- 16 characters x 2 rows
- Blue backlight with white characters
- Character size: 2.95mm x 4.35mm
- Character pixels: 5x7
- Voltage: 5V ± 0.5V
- Current: ~2mA @ 5V
- Dimensions: 80 x 36 x 13 mm
- Temperature range: 0°C to 55°C
- I2C PCF8574 Module:
- Voltage: 5V
- I2C address configurable via A0–A2
- Compatible with 1602/2004 displays
- Adjustable contrast and brightness
- 2 I2C interfaces (Dupont or dedicated cable)
- Operating temp: 0°C to 55°C
Comparison with Non-I2C LCD:
A standard 16x2 LCD without I2C requires many digital pins (typically 6–10) for operation. The I2C version reduces this to just 2 pins (SDA and SCL), simplifying wiring and freeing up valuable microcontroller I/O. It's more compact, easier to use, and scalable for larger projects.