16×2 LCD Display Tutorial Using Deshbot Shield

by devkrishnavhora in Circuits > Arduino

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16×2 LCD Display Tutorial Using Deshbot Shield

This project demonstrates how to interface a 16×2 LCD display with an Arduino Nano. The LCD displays text in two rows, with each row supporting up to 16 characters. The project uses the LCD in 4-bit mode to reduce the number of digital pins required.

Supplies

Deshbot shield

Arduino Nano

16×2 LCD display (HD44780-compatible)

Pin Connections


LCD PinArduino Nano

RS - A4

EN - A3

D4 - A2

D5 - A1

D6 - A0

D7 - D13

VSS - GND

VDD - 5V

VO - Potentiometer middle pin

RW - GND

LED+ (A) - 5V through a suitable resistor, if required

LED− (K) - GND

Connect the potentiometer's outer pins to 5V and GND. Connect its middle pin to the LCD's VO pin to adjust the display contrast.

Working Principle


The Arduino Nano sends commands and character data to the LCD through six control/data connections. The LCD operates in 4-bit mode, using data pins D4–D7. The RS pin selects between commands and character data, while the EN pin enables communication.

When the Arduino starts, the LCD is initialized with 16 columns and 2 rows. The program then displays Hello World! on the first row and Arduino Nano on the second row.

Arduino Code

#include <LiquidCrystal.h>

// RS, EN, D4, D5, D6, D7
LiquidCrystal lcd(A4, A3, A2, A1, A0, 13);

void setup() {
lcd.begin(16, 2);

lcd.setCursor(0, 0);
lcd.print("Hello World!");

lcd.setCursor(0, 1);
lcd.print("Arduino Nano");
}

void loop() {
}

Applications

  1. Displaying sensor readings
  2. Displaying temperature and humidity
  3. Arduino-based monitoring systems
  4. Simple user interfaces
  5. Displaying messages and system status


Downloads

lcd_tutorial.ino

Conclusion


This project demonstrates the basic interfacing of a 16×2 LCD with an Arduino Nano. It introduces LCD pin connections, 4-bit communication, and displaying text using the Arduino LiquidCrystal library. The same setup can be extended to display real-time sensor readings and other project information.