LCD screens are widely used in Arduino projects for displaying information in a user-friendly manner. They provide a visual interface that enhances the interaction between users and their projects. Whether you want to display sensor readings, menu options, or custom messages, an LCD screen is an essential component that can greatly enhance the functionality and user experience of your Arduino projects.

Project: In this example project, we will create a simple temperature and humidity monitor using an Arduino and an LCD screen. The objective of this project is to read temperature and humidity data from a sensor and display it on the LCD screen. This can be useful in various applications such as home automation, greenhouse monitoring, or weather stations.

List of components:

• Arduino Uno (1x) - Link to purchase
• LCD screen (16x2) (1x) - Link to purchase
• DHT11 temperature and humidity sensor (1x) - Link to purchase
• Jumper wires - Male to Male (5x) - Link to purchase

Examples:

1. Example code for initializing the LCD screen and displaying a custom message:

   
   #include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() { // Set up the number of columns and rows of the LCD screen lcd.begin(16, 2); // Print a custom message on the screen lcd.print("Hello, Arduino!"); }

void loop() { // Empty loop }

2. Example code for reading temperature and humidity data from the DHT11 sensor and displaying it on the LCD screen:

include <LiquidCrystal.h>

include <DHT.h>

define DHTPIN 7

define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE); LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() { lcd.begin(16, 2); lcd.print("Temp: "); lcd.setCursor(0, 1); lcd.print("Humidity: "); dht.begin(); }

void loop() { float temperature = dht.readTemperature(); float humidity = dht.readHumidity();

lcd.setCursor(6, 0); lcd.print(temperature); lcd.setCursor(10, 1); lcd.print(humidity); delay(2000); }