CIPAD_08. Comment apprendre à Arduino à compter et réaliser un menu multifonctions.

Introduction

In this tutorial, we will learn how to use Arduino to create a multifunction menu displayed on a single LCD screen. We will also explore how to implement a counting function and navigate through different menu options using two push buttons. This project is a great way to enhance your Arduino skills and understand how to manage user interfaces with simple components.

Step 1: Setting Up the Components

Before starting, gather the following components:

• Arduino board (e.g., Arduino Uno)
• LCD screen (16x2 or similar)
• 2 push buttons
• Resistors (220 ohm for buttons)
• Breadboard and jumper wires

Practical Advice

• Ensure you have a clear workspace.
• Check that all components are functioning before you begin wiring.

Step 2: Wiring the Circuit

Follow these steps to wire the circuit:

1. Connect the LCD screen to the Arduino:

   • VSS to GND
   • VDD to 5V
   • VO (contrast) to a potentiometer (optional)
   • RS to pin 12
   • RW to GND
   • E to pin 11
   • D4 to pin 5
   • D5 to pin 4
   • D6 to pin 3
   • D7 to pin 2
   • A (anode) to 5V (via a resistor)
   • K (cathode) to GND

2. Connect the push buttons:

   • One side of each button to GND.
   • The other side of the first button to pin 6 and the second button to pin 7.
   • Add a resistor (220 ohm) from the button pin to 5V to create a pull-up resistor configuration.

Practical Advice

• Double-check all connections against a wiring diagram to avoid mistakes.

Step 3: Programming the Arduino

Open the Arduino IDE and write the following code to manage counting and menu selection.

#include <LiquidCrystal.h>

// Initialize the LCD with the pin numbers
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int button1Pin = 6; // First button
int button2Pin = 7; // Second button
int count = 0; // Counter variable
int menuOption = 0; // Current menu option

void setup() {
  lcd.begin(16, 2); // Set up the LCD size
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  lcd.print("Menu Option: 0");
}

void loop() {
  if (digitalRead(button1Pin) == LOW) {
    menuOption++;
    if (menuOption > 2) menuOption = 0; // Cycle through options
    displayMenu();
    delay(300); // Debounce delay
  }
  
  if (digitalRead(button2Pin) == LOW) {
    count++;
    lcd.setCursor(0, 1);
    lcd.print("Count: ");
    lcd.print(count);
    delay(300);
  }
}

void displayMenu() {
  lcd.clear();
  lcd.print("Menu Option: ");
  lcd.print(menuOption);
}

Practical Advice

• Make sure to upload the code to your Arduino board. Use the "Verify" function first to check for any syntax errors.

Step 4: Testing the Project

1. Power on your Arduino and observe the LCD.
2. Press the first button to cycle through the menu options.
3. Press the second button to increment the count displayed on the second row of the LCD.

Common Pitfalls

• Ensure that the buttons are properly debounced to avoid multiple counts from a single press.
• Check wiring connections if the LCD does not display correctly.

Conclusion

You have successfully created a multifunction menu display using Arduino and an LCD screen. You've learned how to wire components, program the Arduino, and implement a simple user interface with push buttons. For further exploration, consider adding more menu options or integrating additional sensors to expand the functionality of your project. Happy coding!