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The LCD1602 (16×2) display is a popular choice for Arduino projects, and using it with an I2C interface greatly simplifies wiring by reducing the required pins to just SDA and SCL.
Wiring the LCD1602 with Arduino
VCC → 5V (some modules support 3.3V)
GND → GND
SDA → A4 (Arduino Uno/Nano) or pin 20 (Mega)
SCL → A5 (Arduino Uno/Nano) or pin 21 (Mega)
Ensure the contrast potentiometer on the back of the module is adjusted so characters are visible.
Finding the I2C Address
Before coding, determine your LCD’s I2C address (commonly 0x27 or 0x3F). Upload this scanner code:
#include <Wire.h>void setup() {Wire.begin();Serial.begin(9600);Serial.println("Scanning...");for (byte i = 1; i < 127; i++) {Wire.beginTransmission(i);if (Wire.endTransmission() == 0) {Serial.print("I2C device found at 0x");Serial.println(i, HEX);}}}void loop() {}Copied!✕CopyOpen the Serial Monitor to see the detected address.
Displaying Text on LCD
Install the LiquidCrystal_I2C library from Arduino IDE’s Library Manager, then use:
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