Design with LCD 16x2 attached i2c in Cirkit DesignerThe LCD 16x2 with I2C interface is a 16-character by 2-line alphanumeric display module. It features an integrated I2C communication interface, which significantly reduces the number of pins required for connection to a microcontroller. This makes it an ideal choice for projects where pin availability is limited or where simplified wiring is desired.
This circuit interfaces a 20x4 I2C LCD display with a power source and an I2C communication bus. The LCD is powered by a 4.2V supply from a connector and communicates via I2C through another connector, which provides the SCL and SDA lines as well as ground.
Open Project in Cirkit Designer
This circuit connects an Arduino Leonardo microcontroller to a 16x2 LCD display via an LCM1602 IIC interface module, enabling the display of text on the LCD. The Arduino is programmed to display the messages 'TEST LCD i2C' and 'KelasRobot.com' on the LCD. The IIC module facilitates communication between the Arduino and the LCD using the I2C protocol, simplifying the wiring and pin usage.
Open Project in Cirkit Designer
This circuit features an A-Star 32U4 Mini microcontroller connected to a 16x2 I2C LCD screen. The microcontroller provides power and ground to the LCD, and communicates with it via the I2C protocol using the A4 (SDA) and A5 (SCL) pins.
Open Project in Cirkit Designer
This circuit consists of an Arduino Mega 2560 microcontroller connected to a 16x2 I2C LCD screen. The LCD screen is powered by the Arduino's 5V and GND pins, and communicates with the Arduino via the I2C protocol using the SCL and SDA pins.
Open Project in Cirkit Designer
0x27 (may vary depending on the module; check your specific device)The I2C interface reduces the number of pins required to just four. Below is the pin configuration:
| Pin Name | Description |
|---|---|
| VCC | Power supply (5V DC) |
| GND | Ground |
| SDA | Serial Data Line for I2C communication |
| SCL | Serial Clock Line for I2C communication |
Wiring: Connect the LCD 16x2 I2C module to your microcontroller as follows:
VCC to the 5V pin of the microcontroller.GND to the ground pin of the microcontroller.SDA to the I2C data pin (e.g., A4 on Arduino UNO).SCL to the I2C clock pin (e.g., A5 on Arduino UNO).Install Required Libraries:
LiquidCrystal_I2C library. To do this:
LiquidCrystal_I2C and install the library by Frank de Brabander.Write and Upload Code:
#include <Wire.h> // Include the Wire library for I2C communication
#include <LiquidCrystal_I2C.h> // Include the LiquidCrystal_I2C library
// Initialize the LCD with I2C address 0x27 and 16x2 dimensions
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
lcd.begin(); // Initialize the LCD
lcd.backlight(); // Turn on the backlight
lcd.setCursor(0, 0); // Set cursor to the first row, first column
lcd.print("Hello, World!"); // Print text on the first row
lcd.setCursor(0, 1); // Set cursor to the second row, first column
lcd.print("I2C LCD Test"); // Print text on the second row
}
void loop() {
// No actions in the loop for this example
}
0x27, but some modules may use 0x3F or other addresses. Use an I2C scanner sketch to determine the correct address if needed.lcd.backlight() and lcd.noBacklight() functions to control the backlight programmatically.No Display or Blank Screen:
VCC and GND.Garbage Characters on the Screen:
LiquidCrystal_I2C library is correctly installed and included.Backlight Not Working:
lcd.backlight() function in the code.I2C Address Unknown:
#include <Wire.h>
void setup() {
Wire.begin();
Serial.begin(9600);
Serial.println("Scanning for I2C devices...");
for (byte address = 1; address < 127; address++) {
Wire.beginTransmission(address);
if (Wire.endTransmission() == 0) {
Serial.print("I2C device found at address 0x");
Serial.println(address, HEX);
}
}
}
void loop() {
// No actions in the loop
}
Can I use this module with 3.3V microcontrollers?
How do I display custom characters?
LiquidCrystal_I2C library supports custom characters. Refer to the library documentation for details.Can I connect multiple I2C devices to the same microcontroller?
By following this documentation, you can effectively integrate and troubleshoot the LCD 16x2 I2C module in your projects.