CIPAD_06. comment utiliser un écran LCD avec une carte Aruino

Introduction

This tutorial will guide you through the process of using an LCD screen with an Arduino board. You will learn how to display text and variable values on the LCD, which is a fundamental skill for various electronic projects. By the end of this guide, you'll have a working setup that you can expand on for future projects.

Step 1: Gather Required Components

Before starting, ensure you have the following components:

• Arduino board (e.g., Arduino Uno)
• LCD screen (16x2 or similar)
• Potentiometer (for contrast adjustment)
• Breadboard
• Jumper wires
• Resistor (220 ohms is common for backlight)

Practical Tips

• Check that your LCD is compatible with Arduino.
• A potentiometer is essential for adjusting the display contrast.

Step 2: Connect the LCD to the Arduino

Follow these connections to set up your LCD with the Arduino:

1. LCD Pin Connections:
   • VSS (pin 1) to GND
   • VDD (pin 2) to +5V
   • V0 (pin 3) to the middle pin of the potentiometer
   • RS (pin 4) to pin 12 on Arduino
   • RW (pin 5) to GND
   • E (pin 6) to pin 11 on Arduino
   • D0-D3 (pins 7-10) are not used for 4-bit mode
   • D4 (pin 11) to pin 5 on Arduino
   • D5 (pin 12) to pin 4 on Arduino
   • D6 (pin 13) to pin 3 on Arduino
   • D7 (pin 14) to pin 2 on Arduino
   • A (pin 15) to +5V (through a resistor)
   • K (pin 16) to GND

Common Pitfalls

• Ensure the connections are secure to avoid display issues.
• Double-check pin numbers to match your Arduino model.

Step 3: Install the Required Libraries

For the LCD to work properly with Arduino, you'll need to install the LiquidCrystal library:

1. Open the Arduino IDE.
2. Go to Sketch > Include Library > Manage Libraries.
3. Search for "LiquidCrystal" and install it if it's not already included.

Step 4: Write the Arduino Code

Use the following code to display text on the LCD:

#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 LCD's number of columns and rows
  lcd.begin(16, 2);
  // Print a message to the LCD
  lcd.print("Hello, World!");
}

void loop() {
  // Display variable value or update as needed
}

Practical Advice

• Modify the lcd.print() line to customize the displayed message.
• Use lcd.setCursor(column, row) to change the cursor position if needed.

Step 5: Upload Code and Test the Setup

1. Connect your Arduino to your computer using a USB cable.
2. Select the correct board and port from the Arduino IDE.
3. Click on the upload button.
4. Observe the LCD screen for the displayed message.

Troubleshooting

• If the display is blank, check the power supply and connections.
• Adjust the potentiometer to change display contrast.

Conclusion

You've successfully set up an LCD screen with your Arduino and displayed text on it. This foundational knowledge allows you to expand your projects by displaying data from sensors, user inputs, and more. Next, consider experimenting with different messages or integrating sensors to display variable values on the LCD. Happy coding!